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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-31899] Improve getTerm() performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-31899</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An insert-heavy workload shows that the biggest bottleneck is the contention on the replication coordinator mutex between calls to getTerm() and calls to setMyLastAppliedOpTimeForward().&lt;/p&gt;

&lt;p&gt;In 3.4, these same mutex acquisitions were there, so I&apos;m not sure if this is a new issue.  However, I do get a big boost in performance if I comment out the mutex acquisition for getTerm(), so I would like to pursue making this more efficient.&lt;/p&gt;</description>
                <environment></environment>
        <key id="456888">SERVER-31899</key>
            <summary>Improve getTerm() performance</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="13201">Fixed</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Nov 2017 20:55:32 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:39 +0000</updated>
                            <resolved>Mon, 13 Nov 2017 18:03:56 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1724268" author="xgen-internal-githook" created="Mon, 13 Nov 2017 17:58:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;username&apos;: &apos;milkie&apos;, &apos;email&apos;: &apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31899&quot; title=&quot;Improve getTerm() performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31899&quot;&gt;&lt;del&gt;SERVER-31899&lt;/del&gt;&lt;/a&gt; make getTerm() use an Atomic rather than lock the replcoord mutex&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9fbb130337619500dfe153bf3fc856d1852cc0ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9fbb130337619500dfe153bf3fc856d1852cc0ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1722622" author="milkie" created="Fri, 10 Nov 2017 15:56:07 +0000"  >&lt;p&gt;More careful control of when the term gets updated is a bigger project (and might be too difficult to tackle), as acquiring a Global X lock can be disruptive in non-obvious ways.  I think I will go the Atomic route first, to see how that performs.&lt;/p&gt;</comment>
                            <comment id="1722206" author="milkie" created="Fri, 10 Nov 2017 00:27:38 +0000"  >&lt;p&gt;Ah yes, we could make the _term variable a &quot;GM&quot; synchronization-rule.  That could work.&lt;/p&gt;</comment>
                            <comment id="1722195" author="schwerin" created="Thu, 9 Nov 2017 23:52:59 +0000"  >&lt;p&gt;Hmmm. The calls to getTerm we&apos;re interested are for optime generation, right? So they only happen when the global lock is held in MODE_IX or MODE_X? Perhaps more careful control of when the term gets updated could allow us to call getTerm when the global lock is held in such a mode &lt;em&gt;without&lt;/em&gt; acquiring the repl mutex.&lt;/p&gt;</comment>
                            <comment id="1722006" author="milkie" created="Thu, 9 Nov 2017 20:56:57 +0000"  >&lt;p&gt;One idea to try is to use an Atomic for storing the term that is fetched with getTerm().  This value is written at the same time as the _term member variable (or replaces it).&lt;/p&gt;</comment>
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            <issuekey id="449967">SERVER-31694</issuekey>
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