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    <title>MongoDB Jira</title>
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    <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-16333] hot replication mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-16333</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running on a very fast machine an insert workload that seems like it could sustain a very high throughput but seeing pauses not seemingly related to logging or checkpointing I got some stack traces and a lot of the threads seem to be waiting for replicationCoordinator.&lt;/p&gt;

&lt;p&gt;This happens to be a standalone mongod which makes it particularly puzzling.&lt;/p&gt;</description>
                <environment></environment>
        <key id="171412">SERVER-16333</key>
            <summary>hot replication mutex</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Nov 2014 15:50:11 +0000</created>
                <updated>Wed, 10 Dec 2014 22:26:29 +0000</updated>
                            <resolved>Thu, 4 Dec 2014 19:32:40 +0000</resolved>
                                    <version>2.8.0-rc1</version>
                                    <fixVersion>2.8.0-rc2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="778752" author="schwerin" created="Thu, 4 Dec 2014 19:32:40 +0000"  >&lt;p&gt;Fixed in 2.8.0-rc2 by Eliot&apos;s commit, above.&lt;/p&gt;</comment>
                            <comment id="775734" author="xgen-internal-githook" created="Tue, 2 Dec 2014 00:57:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16333&quot; title=&quot;hot replication mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16333&quot;&gt;&lt;del&gt;SERVER-16333&lt;/del&gt;&lt;/a&gt;: don&apos;t serialize and deserialize default write concerns&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e7baa714a95e0cb43ad54f4497eec512e774fbec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e7baa714a95e0cb43ad54f4497eec512e774fbec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="773441" author="schwerin" created="Wed, 26 Nov 2014 16:34:59 +0000"  >&lt;p&gt;One option might be to require replica set config changes to hold the global lock in MODE_S, so that the replica set configuration could be observed by anyone holding the global lock in MODE_IX.  We&apos;d have to change the getlasterror command to acquire the global lock in MODE_IX, but otherwise there would be no additional locking on potentially hot code paths.  It would put an additional constraint on reconfig, which might add complexity to heartbeat reconfig.&lt;/p&gt;</comment>
                            <comment id="773434" author="schwerin" created="Wed, 26 Nov 2014 16:28:31 +0000"  >&lt;p&gt;Thanks for the report.  The WriteBatchExecutor and the implementation of the getlasterror command both unconditionally read the &quot;default&quot; get last error value, which is a property of a replica set configuration.  Caching that value someplace where the mutex isn&apos;t required, along preferably in an already-parsed form, should resolve this problem.&lt;/p&gt;</comment>
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            <issuekey id="173871">SERVER-16500</issuekey>
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