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    <title>MongoDB Jira</title>
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    <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-65657] Reduce calls to the cappedInsertNotifier for the oplog </title>
                <link>https://jira.mongodb.org/browse/SERVER-65657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When oplog visibility is in effect, there is no need to signal the oplog notifier on every insert; since the newly-inserted data isn&apos;t visible, any read threads will wake up, find no new data, and go back to sleep.&lt;/p&gt;

&lt;p&gt;Further, we also signal the oplog notifier when we move lastApplied.  This is only necessary when we could be reading at lastApplied, which is only on secondaries (on primaries, the lastAppliedSnapshot may contain holes and is invalid).  Thus we only need to signal at the end of a secondary applier batch, not at every lastApplied update.&lt;/p&gt;

&lt;p&gt;Notifying a condition variable is surprisingly expensive on Linux.  If the condition variable is not being waited on, there&apos;s an uncontended mutex acquire and release (for condition_variable_any) and the signal itself; this is a few atomic operations.  But if it is being waited on, there is system call overhead (futex_wake).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2025367">SERVER-65657</key>
            <summary>Reduce calls to the cappedInsertNotifier for the oplog </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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Apr 2022 14:50:05 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:26 +0000</updated>
                            <resolved>Thu, 2 Jun 2022 20:02:38 +0000</resolved>
                                                    <fixVersion>6.0.1</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4588278" author="xgen-internal-githook" created="Wed, 1 Jun 2022 21:20:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65657&quot; title=&quot;Reduce calls to the cappedInsertNotifier for the oplog &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65657&quot;&gt;&lt;del&gt;SERVER-65657&lt;/del&gt;&lt;/a&gt; Reduce calls to the cappedInsertNotifier for the oplog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7aeab9f7830c47e8b8e3633da35c36d8cfe5a878&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7aeab9f7830c47e8b8e3633da35c36d8cfe5a878&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="545760">SERVER-35057</issuekey>
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