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<channel>
    <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-18842] WiredTiger &amp; indexing: &quot;kernel: Out of memory: Kill process 32011 (mongod) score 966 or sacrifice child&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-18842</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The hidden secondary server I use for backups cannot sync its data from the replica set. It&apos;s a replica set of 3 servers including the one which get killed by the kernel. All are running mongod 3.0.3.&lt;/p&gt;

&lt;p&gt;I&apos;m currently trying to migrate from mmapv1 to WiredTiger. The two main servers use mmapv1. The initial sync goes fine, copying our 292 million documents, mongod takes around 80% of the RAM. Then it starts building the index on _id. After a few %, the kernel kills mongod. I attached the logs from /var/log/messages.&lt;/p&gt;

&lt;p&gt;If I relaunch mongod, it retries building the index, then exits because of (&lt;em&gt;the famous ?&lt;/em&gt;): &lt;/p&gt;
&lt;p/&gt;
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&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;   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;Index Build &quot;Index rebuilding did not complete: 11000 E11000 duplicate key error collection: rum.reports index: _id_ dup key: { : &quot;11jjgtfncmtn9w47mco7vtbbj&quot; }&quot;&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;If I relaunch mongod with indexBuildRetry=false, it restarts cloning the collection from the beginning after showing:&lt;/p&gt;

&lt;p/&gt;
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					&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;_2015-06-05T16:17:37.683+0000 W REPL     [ReplicationExecutor] Failed to load timestamp of most recently applied operation; NoMatchingDocument Did not find any entries in local.oplog.rs_&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This server has only 16GB RAM, and can do a sync with mmapv1 without any problem. The database size is 946GB on mmapv1, and 243GB on WiredTiger (snappy).&lt;/p&gt;

&lt;p&gt;I started running the following command when the cloning was at 236M docs. I attached the result.&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;   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;mongo --eval &quot;while(true) {print(JSON.stringify(db.serverStatus({tcmalloc:1}))); sleep(10*1000)}&quot; &amp;gt; ss.log&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Cloning finishes at 2015-06-05T16:09:38.003+0000.&lt;br/&gt;
Index creation starts at 2015-06-05T16:09:45.606+0000.&lt;/p&gt;

&lt;p&gt;The last log before the kill:&lt;/p&gt;

&lt;p/&gt;
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					&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;2015-06-05T16:12:00.565+0000 I -        [rsSync]   Index Build: 13494400/292298635 4%&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;


&lt;p&gt;On another replica set, this migration worked fine with a database size of 402GB mmapv1 / 133GB WT. For the record, the sync also took all the RAM, but index creation went fine. What&apos;s interesting is that after a restart of mongod on this server, RAM usage went from 100% to 17%. After a few days of continuous writes from the oplog, it&apos;s now at 43% RAM. I did not launch any query or make any backup from this secondary.&lt;/p&gt;

&lt;p&gt;The two replica sets contain the same kind of documents, and the same indexes.&lt;/p&gt;

&lt;p&gt;My &lt;em&gt;storage&lt;/em&gt; configuration:&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;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;storage:&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;  dbPath: /a/b/c&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;  indexBuildRetry: true&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;  journal:&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;    enabled: true&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;  directoryPerDB: false # default&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;  syncPeriodSecs: 60 # default&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;&amp;nbsp;&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;  engine: wiredTiger&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;&amp;nbsp;&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;  wiredTiger:&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;    engineConfig:&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;#      cacheSizeGB: 12 # Default: the maximum of half of physical RAM or 1 gigabyte.&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;      statisticsLogDelaySecs: 0 # If set to 0, WiredTiger does not log statistics.&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;      journalCompressor: snappy # Default: snappy&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;      directoryForIndexes: false # Default: false&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;    collectionConfig:&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;      blockCompressor: snappy # Default: snappy&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;    indexConfig:&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;      prefixCompression: true # Default: true&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;There&apos;s this &lt;em&gt;storage.wiredTiger.engineConfig.cacheSizeGB&lt;/em&gt; setting. I don&apos;t really get what it means. I tried setting the default, or setting it at 14. RAM usage still goes beyond the server capacity.&lt;/p&gt;

&lt;p&gt;This issue could be related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17456&quot; title=&quot;Mongodb 3.0 wiredTiger storage engine memory usage too high.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17456&quot;&gt;&lt;del&gt;SERVER-17456&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17424&quot; title=&quot;WiredTiger uses substantially more memory than accounted for by cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17424&quot;&gt;&lt;del&gt;SERVER-17424&lt;/del&gt;&lt;/a&gt;. I created a new issue, because this one happens during an initial sync, not because of benchmarks.&lt;/p&gt;

&lt;p&gt;In case someone at MongoDB is interested, the servers are monitored by MMS:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The failing group is 556dc2ffe4b0ba305ae49354. The hidden Secondary is the only one running on WiredTiger. It&apos;s the one that I try to sync again and again.&lt;/li&gt;
	&lt;li&gt;The ok group is 556dce19e4b0eea5366e6ae5. The hidden Secondary is the only one running on WiredTiger.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="208704">SERVER-18842</key>
            <summary>WiredTiger &amp; indexing: &quot;kernel: Out of memory: Kill process 32011 (mongod) score 966 or sacrifice child&quot;</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="nicolas_">Nicolas Fouch&#233;</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Jun 2015 16:28:06 +0000</created>
                <updated>Sat, 20 Jun 2015 12:25:32 +0000</updated>
                            <resolved>Sat, 20 Jun 2015 12:25:17 +0000</resolved>
                                    <version>3.0.3</version>
                                                    <component>Index Maintenance</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="946271" author="ramon.fernandez" created="Sat, 20 Jun 2015 12:25:08 +0000"  >&lt;p&gt;Thanks for reporting back &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicolas_&quot; class=&quot;user-hover&quot; rel=&quot;nicolas_&quot;&gt;nicolas_&lt;/a&gt;, and glad to hear that you were able to complete the initial sync. This problem with memory consumption is addressed in  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18829&quot; title=&quot;Cache usage exceeds configured maximum during index builds under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18829&quot;&gt;&lt;del&gt;SERVER-18829&lt;/del&gt;&lt;/a&gt; and will be part of MongoDB 3.0.5, scheduled for the coming weeks.&lt;/p&gt;

&lt;p&gt;If you upgrade to 3.0.5 when it comes out, please note that if you have 16GB of memory it may be too aggressive to let &lt;tt&gt;mongod&lt;/tt&gt; use 14GB for cache, as that may have a negative impact on other parts of the system that need memory (including   filesystem cache and &lt;tt&gt;mongod&lt;/tt&gt; itself), so I&apos;d still recommend you let WiredTiger choose the size of the cache.&lt;/p&gt;

&lt;p&gt;I&apos;m closing this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18829&quot; title=&quot;Cache usage exceeds configured maximum during index builds under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18829&quot;&gt;&lt;del&gt;SERVER-18829&lt;/del&gt;&lt;/a&gt;. Feel free to watch that ticket for updates on when it gets merged into the MongoDB tree.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="939857" author="nicolas_" created="Sun, 14 Jun 2015 19:53:16 +0000"  >&lt;p&gt;I attached new graphs showing memory usage during the last days.&lt;br/&gt;
Despite continuous upserts on a DB which is 10x the size of the RAM, memory usage is steady.&lt;br/&gt;
So, I guess I have to set a small value first, and then grow it incrementally until memory usage is steady at 80% of the total RAM.&lt;/p&gt;</comment>
                            <comment id="936124" author="nicolas_" created="Wed, 10 Jun 2015 09:05:44 +0000"  >&lt;p&gt;I attached a new screenshot of Cache Usage and Activity.&lt;br/&gt;
I see what &lt;tt&gt;cacheSizeGB&lt;/tt&gt; is for. It&apos;s capped at 1GB, it does not lie &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="936119" author="nicolas_" created="Wed, 10 Jun 2015 08:50:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ramon.fernandez&quot; class=&quot;user-hover&quot; rel=&quot;ramon.fernandez&quot;&gt;ramon.fernandez&lt;/a&gt;, it worked with cacheSizeGB: 1.&lt;/p&gt;

&lt;p&gt;Here are log excerpts of the sync:&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;2015-06-09T15:17:49.194+0000 I REPL     [rsSync] initial sync clone all databases&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;2015-06-09T22:50:24.279+0000 I STORAGE  [rsSync] clone rum.reports 294194175&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;2015-06-09T22:50:56.879+0000 I INDEX    [rsSync] build index on: rum.reports properties: { v: 1, key: { _id: 1 }, name: &quot;_id_&quot;, ns: &quot;rum.reports&quot; }&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;2015-06-09T22:50:56.879+0000 I INDEX    [rsSync] building index using bulk method&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;2015-06-09T22:50:59.000+0000 I -        [rsSync]   Index Build: 370200/294505784 0%&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;2015-06-10T04:21:08.002+0000 I -        [rsSync]   Index Build: 294551500/294564782 99%&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;2015-06-10T04:21:19.000+0000 I -        [rsSync]   Index: (2/3) BTree Bottom Up Progress: 17125700/294564782 5%&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;2015-06-10T04:23:59.000+0000 I -        [rsSync]   Index: (2/3) BTree Bottom Up Progress: 278710300/294564782 94%&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;2015-06-10T04:24:07.880+0000 I INDEX    [rsSync]   done building bottom layer, going to commit&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;2015-06-10T04:24:10.977+0000 I INDEX    [rsSync] build index done.  scanned 294564782 total records. 6359 secs&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;2015-06-10T04:24:11.287+0000 I REPL     [rsSync] oplog sync 3 of 3&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;2015-06-10T04:34:35.329+0000 I REPL     [rsSync] initial sync finishing up&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;2015-06-10T04:34:35.329+0000 I REPL     [rsSync] replSet set minValid=5577bbe4:1f&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;2015-06-10T04:34:35.354+0000 I REPL     [rsSync] initial sync done&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;2015-06-10T04:34:35.396+0000 I REPL     [ReplicationExecutor] transition to RECOVERING&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;2015-06-10T04:34:35.397+0000 I REPL     [ReplicationExecutor] transition to SECONDARY&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;I attached a screenshot of RAM usage over time.&lt;br/&gt;
To recap:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Cloning starts at 15:17.&lt;/li&gt;
	&lt;li&gt;Index build starts at 22:50.&lt;/li&gt;
	&lt;li&gt;Btree Bottom Up starts at 04:21. (little spike for Virtual)&lt;/li&gt;
	&lt;li&gt;Oplog sync starts at 04:24.&lt;/li&gt;
	&lt;li&gt;Becomes secondary at 04:34.&lt;/li&gt;
	&lt;li&gt;Restarting mongod at 08:22. I did that just to check how RAM usage will change.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I also did an ss.log, would you like me to share it ?&lt;br/&gt;
In case you wanna check on MMS, I did the sync on a temporary server at &lt;a href=&quot;https://mms.mongodb.com/host/detail/556dc2ffe4b0ba305ae49354/e4579de15068a3f52d5cef56e82d9977&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mms.mongodb.com/host/detail/556dc2ffe4b0ba305ae49354/e4579de15068a3f52d5cef56e82d9977&lt;/a&gt; .&lt;/p&gt;


&lt;p&gt;So... questions:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Resident Memory went as high as 2.03GB, how is this value related to &lt;tt&gt;cacheSizeGB&lt;/tt&gt; (which is at 1GB) ?&lt;/li&gt;
	&lt;li&gt;I still don&apos;t know if RAM usage will still go higher and higher over time, until mongod gets killed by the kernel.&lt;/li&gt;
	&lt;li&gt;If RAM usage won&apos;t go crazy thanks to &lt;tt&gt;cacheSizeGB&lt;/tt&gt;, how can I determine its highest value for optimal performance ?&lt;/li&gt;
	&lt;li&gt;All in all, this killed-by-kernel thing is really scary. How could I be confident with WiredTiger knowing this can happen ? Should I supervise the RAM usage of mongod and restart when it reaches 90% ? You guess no-one wants to do that.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="933044" author="ramon.fernandez" created="Fri, 5 Jun 2015 19:20:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicolas_&quot; class=&quot;user-hover&quot; rel=&quot;nicolas_&quot;&gt;nicolas_&lt;/a&gt;, you may be running into &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18829&quot; title=&quot;Cache usage exceeds configured maximum during index builds under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18829&quot;&gt;&lt;del&gt;SERVER-18829&lt;/del&gt;&lt;/a&gt;. Can you please try lowering the size of the WT cache to, say, 1GB and see if the initial sync completes?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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            <issuekey id="208369">SERVER-18829</issuekey>
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                <attachments>
                            <attachment id="77379" name="Cache Usage and Activity 1GB.png" size="96404" author="nicolas_" created="Wed, 10 Jun 2015 09:05:44 +0000"/>
                            <attachment id="77844" name="Memory usage over time with WiredTiger.png" size="46697" author="nicolas_" created="Sun, 14 Jun 2015 19:53:16 +0000"/>
                            <attachment id="77378" name="WT sync with cacheSizeGB at 1.png" size="45158" author="nicolas_" created="Wed, 10 Jun 2015 08:52:03 +0000"/>
                            <attachment id="76889" name="ss.log.gz" size="483338" author="nicolas_" created="Fri, 5 Jun 2015 16:28:06 +0000"/>
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