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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-81796] Reuse a single OperationContext in JournalFlusher</title>
                <link>https://jira.mongodb.org/browse/SERVER-81796</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now the JournalFlusher thread &lt;span class=&quot;error&quot;&gt;&amp;#91;destroys and recreates&amp;#93;&lt;/span&gt;(&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1501ee35cbe0fba60ecf1d77faa15bc6021a5551/src/mongo/db/storage/control/journal_flusher.cpp#L132-L134&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1501ee35cbe0fba60ecf1d77faa15bc6021a5551/src/mongo/db/storage/control/journal_flusher.cpp#L132-L134&lt;/a&gt;) its OperationContext on each iteration of the loop. This isn&apos;t a cheap operation, and it isn&apos;t necessary. We should instead remove that code and make sure that we release the snapshot prior to sleeping in each iteration. We will also need to be careful not to reuse the OpCtx after it is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1501ee35cbe0fba60ecf1d77faa15bc6021a5551/src/mongo/db/storage/control/journal_flusher.cpp#L254-L260&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;interrupted&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This isn&apos;t the biggest bottleneck in the &lt;tt&gt;j:1&lt;/tt&gt; latency, but because there is only one thread doing the loop, and this currently happens &lt;b&gt;after&lt;/b&gt; we are notified that someone is waiting for journaling, it does contibute to &lt;tt&gt;j:1&lt;/tt&gt; latency. And its relative impact will grow as we address other bottlenecks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2457218">SERVER-81796</key>
            <summary>Reuse a single OperationContext in JournalFlusher</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="chenhao.qu@mongodb.com">Chenhao Qu</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-poc</label>
                            <label>perf-tiger-q4</label>
                    </labels>
                <created>Tue, 3 Oct 2023 13:27:50 +0000</created>
                <updated>Wed, 24 Jan 2024 22:53:09 +0000</updated>
                            <resolved>Tue, 21 Nov 2023 16:45:05 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5895736" author="xgen-internal-githook" created="Tue, 21 Nov 2023 15:52:09 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chenhao Qu&apos;, &apos;email&apos;: &apos;chenhao.qu@mongodb.com&apos;, &apos;username&apos;: &apos;quchenhao&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81796&quot; title=&quot;Reuse a single OperationContext in JournalFlusher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81796&quot;&gt;&lt;del&gt;SERVER-81796&lt;/del&gt;&lt;/a&gt; Reuse a single OperationContext in JournalFlusher&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8dcce7dd33f781d898dbbdeada87cb3cad22664c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8dcce7dd33f781d898dbbdeada87cb3cad22664c&lt;/a&gt;&lt;/p&gt;</comment>
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