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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-8442] Map-reduce memory leak</title>
                <link>https://jira.mongodb.org/browse/SERVER-8442</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Non-mapped virtual memory grows on a mongod primary while map-reduce jobs are run. This leads to bouncing the primary once a day to prevent OOM failures. This happens on a single shard of a sharded cluster.&lt;/p&gt;

&lt;p&gt;Also attached is valgrind massif output from both shards. From the shard1 file you will see memory allocated in the following grow throughout the run:&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;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;-&amp;gt;12.98% (10,360,855B) 0x96F7C9: mongo::ourmalloc(unsigned long) (allocator.h:28)&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;08.59% (6,855,680B) 0xD6C6B1: mongo::MessagingPort::recv(mongo::Message&amp;amp;) (message_port.cpp:188)&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;08.59% (6,854,656B) 0x9AF673: mongo::DBClientConnection::recv(mongo::Message&amp;amp;) (dbclient.cpp:1145)&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;08.59% (6,854,656B) 0x9D2D29: mongo::DBClientCursor::initLazyFinish(bool&amp;amp;) (dbclientcursor.cpp:89)&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;08.59% (6,854,656B) 0x9FC29E: mongo::ParallelSortClusteredCursor::_oldInit() (parallel.cpp:1425)&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;08.59% (6,854,656B) 0x9FB507: mongo::ParallelSortClusteredCursor::_init() (parallel.cpp:1282)&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;08.59% (6,854,656B) 0x9F0DD3: mongo::ClusteredCursor::init() (parallel.cpp:83)&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;08.59% (6,854,656B) 0xA7CADB: mongo::mr::MapReduceFinishCommand::run(std::string const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::string&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) (mr.cpp:1311)&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;08.59% (6,854,656B) 0xA98918: mongo::_execCommand(mongo::Command*, std::string const&amp;amp;, mongo::BSONObj&amp;amp;, int, mongo::BSONObjBuilder&amp;amp;, bool) (dbcommands.cpp:1859)&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;08.59% (6,854,656B) 0xA9968A: 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;
		&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;08.59% (6,854,656B) 0xA9A0E3: 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;08.59% (6,854,656B) 0xB8F3CC: 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;
		&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;08.59% (6,854,656B) 0xB93DAD: 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;
				&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;08.59% (6,854,656B) 0xB1E974: mongo::receivedQuery(mongo::Client&amp;amp;, mongo::DbResponse&amp;amp;, mongo::Message&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;08.59% (6,854,656B) 0xB1F922: mongo::assembleResponse(mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) (instance.cpp:390)&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;08.59% (6,854,656B) 0x9757F1: mongo::MyMessageHandler::process(mongo::Message&amp;amp;, mongo::AbstractMessagingPort*, mongo::LastError*) (db.cpp:192)&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;08.59% (6,854,656B) 0xD6F2A8: 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;08.59% (6,854,656B) 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;08.59% (6,854,656B) 0x5950CBB: clone (clone.S:112)&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>Reproduced on Ubuntu 12.04.1 LTS and OS X</environment>
        <key id="64122">SERVER-8442</key>
            <summary>Map-reduce 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>Sat, 2 Feb 2013 19:41:20 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:34 +0000</updated>
                            <resolved>Fri, 15 Feb 2013 17:58:36 +0000</resolved>
                                    <version>2.2.2</version>
                    <version>2.2.3</version>
                    <version>2.3.2</version>
                                    <fixVersion>2.2.4</fixVersion>
                    <fixVersion>2.4.0-rc1</fixVersion>
                                    <component>MapReduce</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="294361" author="auto" created="Wed, 20 Mar 2013 21:56:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-08T19:03:14Z&apos;, u&apos;name&apos;: u&apos;gregs&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-8442&quot; title=&quot;Map-reduce memory leak&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8442&quot;&gt;&lt;del&gt;SERVER-8442&lt;/del&gt;&lt;/a&gt; don&apos;t release() direct m/r cursors to shards&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/33aa9495f99cc61659961ef7358fb31d8ba1b347&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/33aa9495f99cc61659961ef7358fb31d8ba1b347&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="263514" author="auto" created="Mon, 11 Feb 2013 21:00:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-08T19:03:14Z&apos;, u&apos;name&apos;: u&apos;gregs&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-8442&quot; title=&quot;Map-reduce memory leak&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8442&quot;&gt;&lt;del&gt;SERVER-8442&lt;/del&gt;&lt;/a&gt; don&apos;t release() direct m/r cursors to shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4257f887cca2171cde6353a9aada243a7a02852e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4257f887cca2171cde6353a9aada243a7a02852e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="257817" author="james.wahlin@10gen.com" created="Mon, 4 Feb 2013 17:54:36 +0000"  >&lt;p&gt;Attached valgrind massif output for both shards during map-reduce job.&lt;/p&gt;</comment>
                            <comment id="256624" author="james.wahlin@10gen.com" created="Sat, 2 Feb 2013 19:44:17 +0000"  >&lt;p&gt;As part of investigation please see whether there are any workarounds that can be used for MongoDB 2.2.2.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                                        </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="64444">SERVER-8456</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="77834">SERVER-9861</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                <attachments>
                            <attachment id="23759" name="31190.txt" size="125089" author="james.wahlin@mongodb.com" created="Mon, 4 Feb 2013 17:54:36 +0000"/>
                            <attachment id="23758" name="31307.txt" size="15403" author="james.wahlin@mongodb.com" created="Mon, 4 Feb 2013 17:54:36 +0000"/>
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                            <customfieldvalue>&lt;p&gt;To reproduce:&lt;br/&gt;
1) Setup a 2 shard cluster with a mongos and config server.&lt;br/&gt;
2) mongorestore attached shard1, shard2 and config dumps.&lt;br/&gt;
3) 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;/p&gt;</customfieldvalue>

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