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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-24407] too many WT Cache Eviction cause server hang</title>
                <link>https://jira.mongodb.org/browse/SERVER-24407</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A lot of process insert into MongodDB&#65292;when wt cache full&#65292;will trigger eviction&#65292;even in MongoDB insert thread.  &lt;/p&gt;

&lt;p&gt;But evict is too slow, and so many race conditions, CPU Heavy, Server Hang, can&apos;t server any request.&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;
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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; 131 Thread 145 (Thread 0x7fb86d464700 (LWP 31157)):&lt;/span&gt;&lt;/pre&gt;
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		&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; 132 #0  0x0000000001aa35bb in __wt_txn_update_oldest ()&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; 133 #1  0x0000000001a49a8d in __wt_evict ()&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; 134 #2  0x0000000001a46a9f in __evict_page ()&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; 135 #3  0x0000000001a490f6 in __wt_cache_eviction_worker ()&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; 136 #4  0x0000000001a963b8 in __session_begin_transaction ()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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; 137 #5  0x00000000010a513c in mongo::WiredTigerRecoveryUnit::_txnOpen(mongo::OperationContext*) ()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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; 138 #6  0x00000000010a52f7 in mongo::WiredTigerRecoveryUnit::getSession(mongo::OperationContext*) ()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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; 139 #7  0x00000000010a53ca in mongo::WiredTigerCursor::WiredTigerCursor(std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::al     locator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, unsigned long, bool, mongo::OperationContext*) ()&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;   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; 140 #8  0x000000000109aa11 in mongo::WiredTigerRecordStore::insertRecords(mongo::OperationContext*, std::vector&amp;lt;mongo::Record,      std::allocator&amp;lt;mongo::Record&amp;gt; &amp;gt;*, bool) ()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="291647">SERVER-24407</key>
            <summary>too many WT Cache Eviction cause server hang</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="-1">Unassigned</assignee>
                                    <reporter username="ych.tiger@gmail.com">YANG Chenghu</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Jun 2016 02:55:17 +0000</created>
                <updated>Thu, 14 Jul 2016 16:05:01 +0000</updated>
                            <resolved>Wed, 8 Jun 2016 11:51:08 +0000</resolved>
                                    <version>3.2.6</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1287657" author="ramon.fernandez" created="Wed, 8 Jun 2016 11:51:08 +0000"  >&lt;p&gt;We&apos;re closing this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2560&quot; title=&quot;Stuck trying to update oldest transaction ID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2560&quot;&gt;&lt;del&gt;WT-2560&lt;/del&gt;&lt;/a&gt;, which as been fixed in 3.2.7.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1286286" author="ramon.fernandez" created="Tue, 7 Jun 2016 12:18:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ych.tiger%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;ych.tiger@gmail.com&quot;&gt;ych.tiger@gmail.com&lt;/a&gt;, a colleague points out that this could be a manifestation of &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2560&quot; title=&quot;Stuck trying to update oldest transaction ID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2560&quot;&gt;&lt;del&gt;WT-2560&lt;/del&gt;&lt;/a&gt;, which was fixed in 3.2.7. Can you please upgrade to MongoDB 3.2.7 and see if the problem you&apos;re observing is fixed?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1284748" author="yaoxing.zhang" created="Mon, 6 Jun 2016 08:19:06 +0000"  >&lt;p&gt;Attached the mongodb.log and diagnostic.data&lt;/p&gt;</comment>
                            <comment id="1284744" author="yaoxing.zhang" created="Mon, 6 Jun 2016 08:07:58 +0000"  >&lt;p&gt;By &quot;server hang&quot; I think &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ych.tiger%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;ych.tiger@gmail.com&quot;&gt;ych.tiger@gmail.com&lt;/a&gt; means no requests can be proceeded. I attached a photo, which shows when eviction happens all CRUD counters reduced to 0.&lt;/p&gt;</comment>
                            <comment id="1284736" author="yaoxing.zhang" created="Mon, 6 Jun 2016 07:45:57 +0000"  >&lt;p&gt;CPU: e7-4807@1.87ghz 48 cores&lt;br/&gt;
Memory: 252G&lt;br/&gt;
WiredTigerCache: 10G&lt;br/&gt;
Hard Disk: tried various kinds of hard drives. SSD, SAS, with or without RAID 5/10, same result&lt;br/&gt;
Filesystem: XFS&lt;br/&gt;
Deployment: tried standalone, replica set, sharded cluster, same result&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;numactl --interleave=all mongod -f mongoDB.config --dbpath /data/web-mongodb/db_27017 --logpath /data/web-mongodb/log_27017/mongodb.log --port 27017 --wiredTigerCacheSizeGB 10  #&lt;/p&gt;

&lt;p&gt;systemLog: &lt;br/&gt;
    verbosity: 0  #&#26085;&#24535;&#31890;&#24230;&lt;br/&gt;
    logAppend: true  #&#36861;&#21152;&#26085;&#24535;&lt;br/&gt;
    logRotate: &quot;rename&quot;  #logRotate&#25191;&#34892;&#32467;&#26524;&lt;br/&gt;
    destination: &quot;file&quot;  #&#26085;&#24535;&#26684;&#24335;&lt;br/&gt;
processManagement: &lt;br/&gt;
    fork: true  #&#21518;&#21488;&#36816;&#34892;&lt;br/&gt;
net: &lt;br/&gt;
    maxIncomingConnections: 819  #&#26368;&#22810;&#36830;&#25509;&#25968;&lt;br/&gt;
setParameter:&lt;br/&gt;
    failIndexKeyTooLong: false  #&#36229;&#20986;&#38271;&#24230;&#38480;&#21046;&#30340;&#23383;&#27573;&#19981;&#24314;&#31435;&#32034;&#24341;&#19988;&#19981;&#36820;&#22238;&#38169;&#35823;&lt;br/&gt;
storage: &lt;br/&gt;
    indexBuildRetry: true  #&#23454;&#20363;&#23849;&#28291;&#37325;&#21551;&#21518;&#26159;&#21542;&#37325;&#24314;&#32034;&#24341;&lt;br/&gt;
    journal: &lt;br/&gt;
        enabled: false #&#21551;&#29992;&#26085;&#24535;&lt;br/&gt;
    directoryPerDB: true  #&#27599;&#20010;DB&#19968;&#20010;&#30446;&#24405;&lt;br/&gt;
    syncPeriodSecs: 100000  #&#26816;&#26597;&#28857;(s)&lt;br/&gt;
    engine: &quot;wiredTiger&quot;  #&#23384;&#20648;&#24341;&#25806;&lt;br/&gt;
    wiredTiger: &lt;br/&gt;
        engineConfig: &lt;br/&gt;
            statisticsLogDelaySecs: 0  #&#20851;&#38381;&#32479;&#35745;&#20449;&#24687;&lt;br/&gt;
            directoryForIndexes: true  #&#25968;&#25454;&#12289;&#32034;&#24341;&#20998;&#30446;&#24405;&#23384;&#20648;&lt;br/&gt;
        collectionConfig:&lt;br/&gt;
            blockCompressor: snappy  #&#25968;&#25454;&#21387;&#32553;&#31639;&#27861;&lt;br/&gt;
        indexConfig:&lt;br/&gt;
            prefixCompression: true  #&#24320;&#21551;&#32034;&#24341;&#21069;&#32512;&#21387;&#32553;&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="1284721" author="alexander.gorrod" created="Mon, 6 Jun 2016 07:09:12 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yaoxing.zhang%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;yaoxing.zhang@mongodb.com&quot;&gt;yaoxing.zhang@mongodb.com&lt;/a&gt; In order to determine whether the issue is a MongoDB bug we will need:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;More information about exactly what you mean by &quot;cause server hang&quot; - I don&apos;t see any evidence of a hang&lt;/li&gt;
	&lt;li&gt;A full mongod log file from the deployment&lt;/li&gt;
	&lt;li&gt;An archive of the diagnostic.data directory that will be a sub-directory of the MongoDB database directory&lt;/li&gt;
	&lt;li&gt;Details of the hardware being used&lt;/li&gt;
	&lt;li&gt;Details of the MongoDB configuration options being used&lt;/li&gt;
	&lt;li&gt;Information about the type of MongoDB deployment (standalone, replica set, sharded, etc)&lt;/li&gt;
&lt;/ul&gt;

</comment>
                            <comment id="1284681" author="yaoxing.zhang" created="Mon, 6 Jun 2016 06:00:29 +0000"  >&lt;p&gt;User also mentioned that this problem only happens after upgrading to 3.2.6. 3.0 used to work fine.&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10010">
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            <issuekey id="280352">WT-2560</issuekey>
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                <attachments>
                            <attachment id="125102" name="diagnostic1.png" size="371989" author="ramon.fernandez@mongodb.com" created="Tue, 7 Jun 2016 11:42:15 +0000"/>
                            <attachment id="124904" name="mongo.log.tgz" size="5046539" author="yaoxing.zhang@mongodb.com" created="Mon, 6 Jun 2016 08:19:06 +0000"/>
                            <attachment id="124875" name="pstack.log" size="319516" author="ych.tiger@gmail.com" created="Mon, 6 Jun 2016 02:55:17 +0000"/>
                            <attachment id="124899" name="screenshot-1.png" size="2132797" author="yaoxing.zhang@mongodb.com" created="Mon, 6 Jun 2016 08:07:39 +0000"/>
                            <attachment id="124876" name="top.log" size="14968" author="ych.tiger@gmail.com" created="Mon, 6 Jun 2016 02:55:17 +0000"/>
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70+ mongoimport processes concurrent working.&lt;/p&gt;

&lt;p&gt;wait wt cache full, and happen evcition. &lt;/p&gt;

&lt;p&gt;mongostat watch the commands, and pstack mongod&lt;/p&gt;</customfieldvalue>

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