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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-19273] Short range scan using YCSB cause mongodb crash</title>
                <link>https://jira.mongodb.org/browse/SERVER-19273</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am running YCSB on a 3 node setup. &lt;br/&gt;
Node 1) Runs 3 config servers&lt;br/&gt;
Node 2) Runs mongod and mongos&lt;br/&gt;
Node 3) Runs YCSB clients.&lt;/p&gt;

&lt;p&gt;I insert 30 million rows as mentioned in the blog post &lt;a href=&quot;https://www.mongodb.com/blog/post/performance-testing-mongodb-30-part-1-throughput-improvements-measured-ycsb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/blog/post/performance-testing-mongodb-30-part-1-throughput-improvements-measured-ycsb&lt;/a&gt; here. The row has 1 field of 100 bytes of data. After inserting the data, I run YCSB short range scan with scan length of 50. During the scan my mongod process went down and in the mongod log, I saw:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.506-0700 E STORAGE  [conn1] WiredTiger (12) [1435797161:506959][20793:0x7f03e896a700], connection.open_session: only configured to sup&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;port 20010 sessions (including 10 internal): Cannot allocate memory&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.507-0700 I -        [conn1] Invariant failure: ret resulted in status UnknownError 12: Cannot allocate memory at src/mongo/db/storage/&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;wiredtiger/wiredtiger_session_cache.cpp 49&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.507-0700 E STORAGE  [conn88] WiredTiger (12) [1435797161:507173][20793:0x7f03e1302700], connection.open_session: only configured to su&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;pport 20010 sessions (including 10 internal): Cannot allocate memory&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.507-0700 I -        [conn88] Invariant failure: ret resulted in status UnknownError 12: Cannot allocate memory at src/mongo/db/storage&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/wiredtiger/wiredtiger_session_cache.cpp 49&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.524-0700 I CONTROL  [conn48]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 0xf77369 0xf140f1 0xef99fa 0xd8eae0 0xd8efb6 0xd8a0ce 0xd8a115 0xd78165 0xa83e58 0xa078e2 0xa0801d 0xa1e595 0x9fbb7d 0xbd5714 0xbd5ac4 0xba3a54 0xab4e90&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0x7fb81d 0xf2883b 0x7f03f89559d1 0x7f03f74a786d&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;----- BEGIN BACKTRACE -----&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;backtrace&quot;:[{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;B77369&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;B140F1&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;AF99FA&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;98EAE0&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;98EFB6&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;98A0CE&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;98A115&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;978165&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;683E58&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;6078E2&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;60801D&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;61E595&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;5FBB7D&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;7D5714&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;7D5AC4&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;7A3A54&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;6B4E90&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;3FB81D&quot;},{&quot;b&quot;:&quot;400000&quot;,&quot;o&quot;:&quot;B2883B&quot;},{&quot;b&quot;:&quot;7F03F894E000&quot;,&quot;o&quot;:&quot;79D1&quot;},{&quot;b&quot;:&quot;7F03F73BF000&quot;,&quot;o&quot;:&quot;E886D&quot;}],&quot;processInfo&quot;:{ &quot;mongodbVersion&quot; : &quot;3.0.4&quot;, &quot;gitVersion&quot; : &quot;0481c958daeb2969800511e7475dc66986fa9ed5&quot;, &quot;uname&quot; : { &quot;sysname&quot; : &quot;Linux&quot;, &quot;release&quot; : &quot;2.6.32-431.29.2.el6.x86_64&quot;, &quot;version&quot; : &quot;#1 SMP Tue Sep 9 21:36:05 UTC 2014&quot;, &quot;machine&quot; : &quot;x86_64&quot; }, &quot;somap&quot; : [ { &quot;elfType&quot; : 2, &quot;b&quot; : &quot;400000&quot;, &quot;buildId&quot; : &quot;7702B4740E91E1BA6F701DB2A42553968AC09562&quot; }, { &quot;b&quot; : &quot;7FFF97C38000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5474F0D8DAF3D6177E2C4B06F3892745CB43B4D5&quot; }, { &quot;b&quot; : &quot;7F03F894E000&quot;, &quot;path&quot; : &quot;/lib64/libpthread.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;211321F78CA244BE2B2B1B8584B460F9933BA76B&quot; }, { &quot;b&quot; : &quot;7F03F86E2000&quot;, &quot;path&quot; : &quot;/usr/lib64/libssl.so.10&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;40BEA6554E64FC0C3D5C7D0CD91362730515102F&quot; }, { &quot;b&quot; : &quot;7F03F82FF000&quot;, &quot;path&quot; : &quot;/usr/lib64/libcrypto.so.10&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;FC4EFD7502ACB3B9D213D28272D15A165857AD5A&quot; }, { &quot;b&quot; : &quot;7F03F80F7000&quot;, &quot;path&quot; : &quot;/lib64/librt.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;B26528BF6C0636AC1CAE5AC50BDBC07E60851DF4&quot; }, { &quot;b&quot; : &quot;7F03F7EF3000&quot;, &quot;path&quot; : &quot;/lib64/libdl.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;AFC7448F2F2F6ED4E5BC82B1BD8A7320B84A9D48&quot; }, { &quot;b&quot; : &quot;7F03F7BED000&quot;, &quot;path&quot; : &quot;/usr/lib64/libstdc++.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;F07F2E7CF4BFB393CC9BBE8CDC6463652E14DB07&quot; }, { &quot;b&quot; : &quot;7F03F7969000&quot;, &quot;path&quot; : &quot;/lib64/libm.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;98B028A725D6E93253F25DF00B794DFAA66A3145&quot; }, { &quot;b&quot; : &quot;7F03F7753000&quot;, &quot;path&quot; : &quot;/lib64/libgcc_s.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;246C3BAB0AB093AFD59D34C8CBF29E786DE4BE97&quot; }, { &quot;b&quot; : &quot;7F03F73BF000&quot;, &quot;path&quot; : &quot;/lib64/libc.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;59640F8CD5A70CF0391A7C64275D84336935E6AA&quot; }, { &quot;b&quot; : &quot;7F03F8B6B000&quot;, &quot;path&quot; : &quot;/lib64/ld-linux-x86-64.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;57BF668F99B7F5917B8D55FBB645173C9A644575&quot; }, { &quot;b&quot; : &quot;7F03F717B000&quot;, &quot;path&quot; : &quot;/lib64/libgssapi_krb5.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;54BA6B78A9220344E77463947215E42F0EABCC62&quot; }, { &quot;b&quot; : &quot;7F03F6E95000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6797403AA5F8FAD8ADFF683478B45F528CE4FB0E&quot; }, { &quot;b&quot; : &quot;7F03F6C91000&quot;, &quot;path&quot; : &quot;/lib64/libcom_err.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;8CE28F280150E62296240E70ECAC64E4A57AB826&quot; }, { &quot;b&quot; : &quot;7F03F6A65000&quot;, &quot;path&quot; : &quot;/lib64/libk5crypto.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;05733977F4E41652B86070B27A0CFC2C1EA7719D&quot; }, { &quot;b&quot; : &quot;7F03F684F000&quot;, &quot;path&quot; : &quot;/lib64/libz.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5FA8E5038EC04A774AF72A9BB62DC86E1049C4D6&quot; }, { &quot;b&quot; : &quot;7F03F6644000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5support.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;E3FA235F3BA3F776A01A18ECA737C9890F445923&quot; }, { &quot;b&quot; : &quot;7F03F6441000&quot;, &quot;path&quot; : &quot;/lib64/libkeyutils.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;AF374BAFB7F5B139A0B431D3F06D82014AFF3251&quot; }, { &quot;b&quot; : &quot;7F03F6227000&quot;, &quot;path&quot; : &quot;/lib64/libresolv.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;A91A53E16DEABDFE05F28F7D04DAB5FFAA013767&quot; }, { &quot;b&quot; : &quot;7F03F6008000&quot;, &quot;path&quot; : &quot;/lib64/libselinux.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;E6798A06BEE17CF102BBA44FD512FF8B805CEAF1&quot; } ] }}&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo15printStackTraceERSo+0x29) [0xf77369]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo10logContextEPKc+0xE1) [0xf140f1]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo17invariantOKFailedEPKcRKNS_6StatusES1_j+0xDA) [0xef99fa]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo17WiredTigerSessionC1EP15__wt_connectionii+0xA0) [0xd8eae0]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo22WiredTigerSessionCache10getSessionEv+0x4C6) [0xd8efb6]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo22WiredTigerRecoveryUnit10getSessionEPNS_16OperationContextE+0x3E) [0xd8a0ce]&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo16WiredTigerCursorC1ERKSsmbPNS_16OperationContextE+0x35) [0xd8a115]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZNK5mongo21WiredTigerIndexUnique9newCursorEPNS_16OperationContextEi+0x55) [0xd78165]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZNK5mongo22BtreeBasedAccessMethod9newCursorEPNS_16OperationContextERKNS_13CursorOptionsEPPNS_11IndexCursorE+0x28) [0xa83e58]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo9IndexScan13initIndexScanEv+0x62) [0xa078e2]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo9IndexScan4workEPm+0x4D) [0xa0801d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo16ShardFilterStage4workEPm+0x55) [0xa1e595]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo10FetchStage4workEPm+0xCD) [0x9fbb7d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo12PlanExecutor18getNextSnapshottedEPNS_11SnapshottedINS_7BSONObjEEEPNS_8RecordIdE+0xA4) [0xbd5714]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE+0x34) [0xbd5ac4]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo8runQueryEPNS_16OperationContextERNS_7MessageERNS_12QueryMessageERKNS_15NamespaceStringERNS_5CurOpES3_+0xA74) [0xba3a54]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0xB10) [0xab4e90]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0xDD) [0x7fb81d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x34B) [0xf2883b]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; libpthread.so.0(+0x79D1) [0x7f03f89559d1]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; libc.so.6(clone+0x6D) [0x7f03f74a786d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-----  END BACKTRACE  -----&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-01T17:32:41.524-0700 I -        [conn48] &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment>RAM: 128GB&lt;br/&gt;
Disks: 8 disks, 7200 RPM, 1TB - in a RAID 0 array&lt;br/&gt;
CPU: Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz - 16 physical cores, 32 HT cores&lt;br/&gt;
Network: 1x10gbe&lt;br/&gt;
OS: CentOS 6.5&lt;br/&gt;
JVM: 1.7.0_67</environment>
        <key id="214639">SERVER-19273</key>
            <summary>Short range scan using YCSB cause mongodb crash</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="milindshah">Milind Shah</reporter>
                        <labels>
                            <label>crash</label>
                    </labels>
                <created>Thu, 2 Jul 2015 18:30:22 +0000</created>
                <updated>Tue, 25 Aug 2015 23:07:55 +0000</updated>
                            <resolved>Tue, 25 Aug 2015 23:07:55 +0000</resolved>
                                    <version>3.0.4</version>
                                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="992399" author="ramon.fernandez" created="Wed, 29 Jul 2015 21:50:52 +0000"  >&lt;p&gt;I forgot to add that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17386&quot; title=&quot;Cursor cache causes excessive memory utilization in WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17386&quot;&gt;&lt;del&gt;SERVER-17386&lt;/del&gt;&lt;/a&gt; fixes the issue of cursors consuming excessive amounts of memory on WiredTiger. The fix is included in 3.0.5, which was released earlier this week &amp;#8211; so rather than trying the workarounds posted above I&apos;d encourage users to first try using 3.0.5.&lt;/p&gt;

&lt;p&gt;Cheers,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="992396" author="ramon.fernandez" created="Wed, 29 Jul 2015 21:48:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milindshah&quot; class=&quot;user-hover&quot; rel=&quot;milindshah&quot;&gt;milindshah&lt;/a&gt;, the error message&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;only configured to support 20010 sessions (including 10 internal): Cannot allocate memory&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;appeared earlier in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17364&quot; title=&quot;Idle cursors shouldn&amp;#39;t hold storage engine resources&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17364&quot;&gt;&lt;del&gt;SERVER-17364&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;You may be able to work around it by increasing &lt;tt&gt;session_max&lt;/tt&gt;, for example:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;--wiredTigerEngineConfigString=&quot;session_max=40000&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Note that this will increase memory consumption. The second alternative is to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17364?focusedCommentId=946407&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-946407&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;set a low timeout for idle cursors&lt;/a&gt;; for example, to close cursors after 60 seconds of inactivity:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;use admin&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.runCommand({setParameter:1, cursorTimeoutMillis: 60000})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Please note that setting a low value for &lt;tt&gt;cursorTimeoutMillis&lt;/tt&gt; may negatively impact applications that rely on idle cursors remaining open for values higher than &lt;tt&gt;cursorTimeoutMillis&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.j.moore%40allanbank.com&quot; class=&quot;user-hover&quot; rel=&quot;robert.j.moore@allanbank.com&quot;&gt;robert.j.moore@allanbank.com&lt;/a&gt;, after using 3.0.3-SNAPSHOT, does the server still aborts with those &lt;tt&gt;Cannot allocate memory&lt;/tt&gt; errors?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="962417" author="rassi@10gen.com" created="Thu, 9 Jul 2015 18:14:35 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martin.bligh&quot; class=&quot;user-hover&quot; rel=&quot;martin.bligh&quot;&gt;martin.bligh&lt;/a&gt;: could you weigh in for triage, please?  I don&apos;t have much context on this issue, but Mathias suggests that this is either a dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17364&quot; title=&quot;Idle cursors shouldn&amp;#39;t hold storage engine resources&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17364&quot;&gt;&lt;del&gt;SERVER-17364&lt;/del&gt;&lt;/a&gt;, or that it is caused by a defect in the WiredTiger session cache that he believes you to be working on.&lt;/p&gt;</comment>
                            <comment id="960985" author="jeff.yemin" created="Wed, 8 Jul 2015 14:20:23 +0000"  >&lt;p&gt;I reproduced this issue and discovered a defect in the Java driver, which is now linked to this ticket.&lt;/p&gt;</comment>
                            <comment id="960354" author="robert.j.moore@allanbank.com" created="Wed, 8 Jul 2015 03:18:16 +0000"  >&lt;p&gt;I spoke too soon. The stalls are still happening with all of the threads in:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	- parking to wait for  &amp;lt;0x000000076d4fa6d8&amp;gt; (a java.util.concurrent.Semaphore$FairSync)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:409)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.internal.connection.ConcurrentPool.acquirePermit(ConcurrentPool.java:180)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.internal.connection.ConcurrentPool.get(ConcurrentPool.java:126)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
</comment>
                            <comment id="960332" author="robert.j.moore@allanbank.com" created="Wed, 8 Jul 2015 02:20:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt; - &lt;/p&gt;

&lt;p&gt;I just ran the same tests with the 3.0.3-SNAPSHOT jar and it did not stall during the scans operations.&lt;/p&gt;

&lt;p&gt;Could the extra calls have been causing the connections to not get returned to the connection pool? &lt;/p&gt;

&lt;p&gt;Rob.&lt;/p&gt;</comment>
                            <comment id="960304" author="jeff.yemin" created="Wed, 8 Jul 2015 01:35:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.j.moore%40allanbank.com&quot; class=&quot;user-hover&quot; rel=&quot;robert.j.moore@allanbank.com&quot;&gt;robert.j.moore@allanbank.com&lt;/a&gt; the &quot;killcursors: found 0 of 1&quot; messages are due to &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-1854&quot; title=&quot;Driver tries to kill a cursor twice when limit is reached on the first batch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-1854&quot;&gt;&lt;del&gt;JAVA-1854&lt;/del&gt;&lt;/a&gt;, which is fixed in the 3.0.3-SNAPSHOT release (&lt;a href=&quot;https://oss.sonatype.org/content/repositories/snapshots/org/mongodb/mongo-java-driver/3.0.3-SNAPSHOT/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://oss.sonatype.org/content/repositories/snapshots/org/mongodb/mongo-java-driver/3.0.3-SNAPSHOT/&lt;/a&gt;).  Essentially, when a limit is set on a query, the driver sends OP_KILL_CURSOR twice for the same cursor, once when the limit is reached and once when MongoCursor#close is called.&lt;/p&gt;</comment>
                            <comment id="960076" author="mdcallag" created="Tue, 7 Jul 2015 21:33:45 +0000"  >&lt;p&gt;problem being discussed as next YCSB release is being tested&lt;br/&gt;
&lt;a href=&quot;https://github.com/brianfrankcooper/YCSB/issues/266#issuecomment-112930542&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/brianfrankcooper/YCSB/issues/266#issuecomment-112930542&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="958607" author="asya" created="Mon, 6 Jul 2015 17:32:45 +0000"  >&lt;p&gt;Ah, sorry just saw 25 threads in the repro section.&lt;/p&gt;

&lt;p&gt;Will try that.&lt;/p&gt;</comment>
                            <comment id="958605" author="asya" created="Mon, 6 Jul 2015 17:31:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=computingfreak%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;computingfreak@gmail.com&quot;&gt;computingfreak@gmail.com&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;What&apos;s the exact YCSB command - how many threads are you using?  I&apos;d like to reproduce this here.&lt;/p&gt;</comment>
                            <comment id="958036" author="robert.j.moore@allanbank.com" created="Sun, 5 Jul 2015 23:28:14 +0000"  >&lt;p&gt;Attaching the script I used to run the tests. It downloads the YCSB, builds and runs the workloads. Feel free to modify to just run the mongodb driver with 5 threads and 5 connections which shows the worst behaviour. &lt;/p&gt;

&lt;p&gt;Run with:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh integration-test.sh 0.2.0-RC3&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="958034" author="robert.j.moore@allanbank.com" created="Sun, 5 Jul 2015 23:24:57 +0000"  >&lt;p&gt;The tests finally finished and I see the same behaviour for the cursors with 3.0.4:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05T11:59:39.256-0400 I COMMAND  [conn647] killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05T11:59:39.258-0400 I COMMAND  [conn645] killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05T11:59:39.258-0400 I COMMAND  [conn646] killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05T11:59:39.258-0400 I COMMAND  [conn646] killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="957978" author="robert.j.moore@allanbank.com" created="Sun, 5 Jul 2015 14:00:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milindshah&quot; class=&quot;user-hover&quot; rel=&quot;milindshah&quot;&gt;milindshah&lt;/a&gt; - &lt;/p&gt;

&lt;p&gt;As a workaround you can use the `mongodb-async` driver with YCSB. You might also see a performance increase as a result. &lt;/p&gt;

&lt;p&gt;Just change &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  ycsb run mongodb ...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;to&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  ycsb run mongodb-async ...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Rob.&lt;/p&gt;</comment>
                            <comment id="957977" author="robert.j.moore@allanbank.com" created="Sun, 5 Jul 2015 13:56:23 +0000"  >&lt;p&gt;Logs for 2.2.7 and 2.4.14.  2.6.10 is showing the same behaviour but is still running. I don&apos;t have a stack trace for 2.4.14 since it happened in the middle of the night.&lt;/p&gt;</comment>
                            <comment id="957933" author="robert.j.moore@allanbank.com" created="Sun, 5 Jul 2015 02:25:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; -&lt;/p&gt;

&lt;p&gt;I am seeing something strange with the out of the box workloade using the MongoDB Inc driver. After having &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt; look at the code I am pretty sure the cursors are getting closed, or trying, but I am not convinced they are the right cursors.&lt;/p&gt;

&lt;p&gt;I am going through all of the production MongoDB versions since 1.8 and testing the YCSB 0.2.0-RC3 and for the workloade I am getting timeouts trying to get connections.  I will attach the logs as I get them but for the 2.0.9 server I see this from the script:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-04 20:53:11: 2.0.9    : Load: workloade with mongodb-async thread=  5 conns= 5 --&amp;gt;         27 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-04 20:53:38: 2.0.9    :  Run: workloade with mongodb-async thread=  5 conns= 5 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-04 20:54:05: 2.0.9    : Load: workloade with mongodb       thread=  5 conns= 5 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-04 20:54:31: 2.0.9    :  Run: workloade with mongodb       thread=  5 conns= 5 --&amp;gt;      14786 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:00:57: 2.0.9    : Load: workloade with mongodb-async thread= 10 conns= 5 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:01:23: 2.0.9    :  Run: workloade with mongodb-async thread= 10 conns= 5 --&amp;gt;         27 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:01:50: 2.0.9    : Load: workloade with mongodb       thread= 10 conns= 5 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:02:16: 2.0.9    :  Run: workloade with mongodb       thread= 10 conns= 5 --&amp;gt;        246 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:06:22: 2.0.9    : Load: workloade with mongodb-async thread= 10 conns=10 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:06:48: 2.0.9    :  Run: workloade with mongodb-async thread= 10 conns=10 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:07:14: 2.0.9    : Load: workloade with mongodb       thread= 10 conns=10 --&amp;gt;         27 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:07:41: 2.0.9    :  Run: workloade with mongodb       thread= 10 conns=10 --&amp;gt;        625 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:18:07: 2.0.9    : Load: workloade with mongodb-async thread= 20 conns=10 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:18:33: 2.0.9    :  Run: workloade with mongodb-async thread= 20 conns=10 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:18:59: 2.0.9    : Load: workloade with mongodb       thread= 20 conns=10 --&amp;gt;         26 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-07-05 01:19:25: 2.0.9    :  Run: workloade with mongodb       thread= 20 conns=10 --&amp;gt;        246 seconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;(Ignore the 20 to 01 hour change. I am using the wrong date expression in the script.  It is 20 to 21 hours.)&lt;/p&gt;

&lt;p&gt;In the MongoDB logs for the 2015-07-04 20:54:31 period I see lots of:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Jul  4 20:08:38 [conn625] killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Jul  4 20:08:38 [conn625] ClientCursor::find(): cursor not found in map 3603954716566437622 (ok after a drop)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;killcursors: found 0 of 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;It appears in the YCSB logs (which I will attach) that the driver lost track of the connections completely and that caused all of the threads to eventually have to timeout waiting for a connection. I&apos;ll attach a stacktrace showing the threads are all waiting for a connection.&lt;/p&gt;

&lt;p&gt;I know that 2.0.9 is ancient but I am seeing the same thing with 2.2.7 so I think it is something systemic. I will report back once all of the server versions finish if I see the same thing on more recent versions.&lt;/p&gt;

&lt;p&gt;Rob.&lt;/p&gt;</comment>
                            <comment id="957802" author="milindshah" created="Fri, 3 Jul 2015 17:07:00 +0000"  >&lt;p&gt;Thanks Asya.  I am using the latest YCSB from &lt;a href=&quot;https://github.com/brianfrankcooper/YCSB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/brianfrankcooper/YCSB&lt;/a&gt;. I will not use the scan test in that case.&lt;/p&gt;</comment>
                            <comment id="957187" author="asya" created="Thu, 2 Jul 2015 19:26:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milindshah&quot; class=&quot;user-hover&quot; rel=&quot;milindshah&quot;&gt;milindshah&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Based on the Google Groups discussion, if you want to use &quot;scan&quot; operation, you should NOT be using a hashed shard key - hashing the shard key removes the ability to do efficient scans over the index.&lt;/p&gt;

&lt;p&gt;In addition, it appears that the official YCSB master may have introduced a cursor leak in the scan method, so I would recommend not including &quot;scan&quot; operation in your tests (at least for the moment).&lt;/p&gt;

&lt;p&gt;Asya&lt;/p&gt;</comment>
                            <comment id="957161" author="asya" created="Thu, 2 Jul 2015 19:11:52 +0000"  >&lt;p&gt;Which YCSB version are you using for these tests?&lt;/p&gt;
</comment>
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