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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-9861] MapReduceFinishCommand Memory Leak</title>
                <link>https://jira.mongodb.org/browse/SERVER-9861</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of October 23rd, 2013&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
When mapReduce is run repeatedly on the same client connection the mongod will continue to keep track of any temporary collections used during the mapReduce.  These temporary collection names will slowly build up in a cache on the mongod, appearing as a slow memory leak.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
This impacts users of mapReduce on sharded collections and manifests as a slow increase in non-mapped virtual memory on mongod.  It is present in versions of MongoDB prior to and including v2.4.6.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;SOLUTION&lt;/b&gt;&lt;br/&gt;
After each mapReduce completes and the temporary collections are dropped, also explicitly remove the collection name from the cache used for keeping track of namespace versioning.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
This issue can be worked around by stepping down the primary mongod of the shard.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
Production release v2.4.7 contains the fix for this issue, and production release v2.6.0 will contain the fix as well.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h4&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h4&gt;

&lt;p&gt;When running map-reduce continually with the test set provided we see 2 paths in which there is continual heap growth. The following is valgrind massif output for both. Note that in my test, case 1 grew from 2 to 6 MB and case 2 grew from 1 to 3 MB, over the course of a few hours.&lt;br/&gt;
&lt;b&gt;Case 1:&lt;/b&gt;&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Second (looks like stats logging for temporary MR namespaces?):&lt;/p&gt;
&lt;p/&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;| | |             -&amp;gt;04.73% (3,470,080B) 0x67E684: mongo::execCommand(mongo::Command*, mongo::Client&amp;amp;, int, char const*, mongo::BSONObj&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) (dbcommands.cpp:1985)&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;| | |               -&amp;gt;04.73% (3,470,080B) 0x67F58B: mongo::_runCommands(char const*, mongo::BSONObj&amp;amp;, mongo::_BufBuilder&amp;lt;mongo::TrivialAllocator&amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool, int) (dbcommands.cpp:2069)&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;| | |                 -&amp;gt;04.73% (3,470,080B) 0x74CFC8: mongo::runCommands(char const*, mongo::BSONObj&amp;amp;, mongo::CurOp&amp;amp;, mongo::_BufBuilder&amp;lt;mongo::TrivialAllocator&amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool, int) (query.cpp:43)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;| | |                   -&amp;gt;04.73% (3,470,080B) 0x750AAD: mongo::runQuery(mongo::Message&amp;amp;, mongo::QueryMessage&amp;amp;, mongo::CurOp&amp;amp;, mongo::Message&amp;amp;) (query.cpp:920)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;| | |                     -&amp;gt;04.73% (3,470,080B) 0x6FB166: mongo::assembleResponse(mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) (instance.cpp:244)&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;| | |                       -&amp;gt;04.73% (3,470,080B) 0x592777: mongo::MyMessageHandler::process(mongo::Message&amp;amp;, mongo::AbstractMessagingPort*, mongo::LastError*) (db.cpp:193)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;| | |                         -&amp;gt;04.73% (3,470,080B) 0x90DDC9: mongo::pms::threadRun(mongo::MessagingPort*) (message_server_port.cpp:85)&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;| | |                           -&amp;gt;04.73% (3,470,080B) 0x4E35E98: start_thread (pthread_create.c:308)&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;| | |                             -&amp;gt;04.73% (3,470,080B) 0x5950CCB: clone (clone.S:112)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment>MongoDB 2.2.4, Ubuntu 12.0.4</environment>
        <key id="77834">SERVER-9861</key>
            <summary>MapReduceFinishCommand Memory Leak</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="9">Done</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Jun 2013 17:34:12 +0000</created>
                <updated>Mon, 11 Jul 2016 17:37:33 +0000</updated>
                            <resolved>Tue, 6 Aug 2013 13:55:19 +0000</resolved>
                                    <version>2.2.4</version>
                    <version>2.4.4</version>
                                    <fixVersion>2.4.7</fixVersion>
                    <fixVersion>2.5.2</fixVersion>
                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="434966" author="auto" created="Wed, 2 Oct 2013 23:48:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9861&quot; title=&quot;MapReduceFinishCommand Memory Leak&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9861&quot;&gt;&lt;del&gt;SERVER-9861&lt;/del&gt;&lt;/a&gt; explicitly forget temporary collections for versioning in M/R&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8d082558e94bf937de09a1d6be62cc85441c1c5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8d082558e94bf937de09a1d6be62cc85441c1c5b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="396890" author="auto" created="Tue, 6 Aug 2013 13:54:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9861&quot; title=&quot;MapReduceFinishCommand Memory Leak&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9861&quot;&gt;&lt;del&gt;SERVER-9861&lt;/del&gt;&lt;/a&gt; explicitly forget temporary collections for versioning in M/R&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e0d9e65fd3c2dfaec1c82504c310288aacac9ce4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e0d9e65fd3c2dfaec1c82504c310288aacac9ce4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="352706" author="james.wahlin@10gen.com" created="Tue, 4 Jun 2013 17:35:18 +0000"  >&lt;p&gt;Attached ms_print formatted valgrind massif output.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="64122">SERVER-8442</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                <attachments>
                            <attachment id="27585" name="1456.txt" size="89027" author="james.wahlin@mongodb.com" created="Tue, 4 Jun 2013 17:35:18 +0000"/>
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                            <customfieldvalue>&lt;p&gt;To reproduce:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Setup a 2 shard MongoDB 2.2.4 cluster with a mongos and config server.&lt;/li&gt;
	&lt;li&gt;mongorestore attached shard1, shard2 and config dumps.&lt;/li&gt;
	&lt;li&gt;Run attached map-reduce-loop.js script against the clusters mongos.&lt;br/&gt;
You will see memory grow on shard1 (looks like no data is found on shard2).&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Files to use for the restore are:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/23760/map-reduce-leak.js&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Map Reduce Script&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/23602/traffic_shard1.tar.gz&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Mongodump - Shard 1&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/23609/traffic_shard2.tar.gz&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Mongodump - Shard 2&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/23608/config.tar.gz&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Mongodump - Config&lt;/a&gt;&lt;/p&gt;</customfieldvalue>

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