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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>
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<item>
            <title>[SERVER-2581] MR locks server for a long time in merge and reduce modes with many keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-2581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is probably necessary to implement the current atomic semantics, but I think we could have an optional non-atomic mode&lt;/p&gt;</description>
                <environment></environment>
        <key id="14789">SERVER-2581</key>
            <summary>MR locks server for a long time in merge and reduce modes with many keys</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="antoine">Antoine Girbal</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Feb 2011 20:37:46 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:13 +0000</updated>
                            <resolved>Thu, 16 Feb 2012 04:02:43 +0000</resolved>
                                                    <fixVersion>2.1.1</fixVersion>
                                    <component>Performance</component>
                                        <votes>2</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="159616" author="antoine" created="Sat, 1 Sep 2012 00:40:31 +0000"  >&lt;p&gt;Doc was added:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;{ &lt;b&gt;nonAtomic&lt;/b&gt; : 1} - &lt;b&gt;MongoDB 2.1&amp;#43;&lt;/b&gt; If true then the post processing step will not be executed under the write lock. This option makes sense only for the &quot;merge&quot; and &quot;replace&quot; output which take time to process and would lock the database. Using this flag means that partial results will be visible as they are processed.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="130401" author="nodkz" created="Mon, 11 Jun 2012 17:19:18 +0000"  >&lt;p&gt;Please add to DOCS information about this flag.&lt;br/&gt;
&lt;a href=&quot;http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="88905" author="antoine" created="Thu, 16 Feb 2012 04:02:27 +0000"  >&lt;p&gt;@Nathan yes it will be supported with sharding.&lt;br/&gt;
There wasnt any bug in fixForShards, because nonAtomic is a subfield of &quot;out&quot;.&lt;/p&gt;</comment>
                            <comment id="88904" author="auto" created="Thu, 16 Feb 2012 03:58:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;agirbal&apos;, u&apos;name&apos;: u&apos;agirbal&apos;, u&apos;email&apos;: u&apos;antoine@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2581&quot; title=&quot;MR locks server for a long time in merge and reduce modes with many keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2581&quot;&gt;&lt;del&gt;SERVER-2581&lt;/del&gt;&lt;/a&gt;: added tests for nonAtomic and other MR&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/00679f7b828368c4a99dd621cc7a58ec4156d0d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/00679f7b828368c4a99dd621cc7a58ec4156d0d1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="61120" author="nehresma" created="Tue, 18 Oct 2011 14:19:52 +0000"  >&lt;p&gt;Will this be supported in a sharded environment?  In cf953c164861, I didn&apos;t see the &quot;nonAtomic&quot; output option added to MRCmd::fixForShards in commands_public.cpp, so I think it may cause an error (&quot;unknown m/r field for sharding&quot;) if I&apos;m reading the code right.&lt;/p&gt;</comment>
                            <comment id="53860" author="antoine" created="Tue, 13 Sep 2011 21:55:44 +0000"  >&lt;p&gt;added a &quot;nonAtomic&quot; flag to output option&lt;/p&gt;</comment>
                            <comment id="53857" author="auto" created="Tue, 13 Sep 2011 21:53:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;agirbal&apos;, u&apos;name&apos;: u&apos;agirbal&apos;, u&apos;email&apos;: u&apos;antoine@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2581&quot; title=&quot;MR locks server for a long time in merge and reduce modes with many keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2581&quot;&gt;&lt;del&gt;SERVER-2581&lt;/del&gt;&lt;/a&gt;: MR locks server for a long time in merge and reduce modes with many keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cf953c164861f764eb7b4333cf97e2159a08ab3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cf953c164861f764eb7b4333cf97e2159a08ab3d&lt;/a&gt;&lt;/p&gt;</comment>
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