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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-74555] Re-introduce majority commit point advancement notification mechanism and use for change streams</title>
                <link>https://jira.mongodb.org/browse/SERVER-74555</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An optimization to only wake up a tailable + awaitData cursor when the majority commit point advances (when reading only majority committed data) was originally introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69959&quot; title=&quot;Introduce majority committed point advancement notification mechanism&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69959&quot;&gt;&lt;del&gt;SERVER-69959&lt;/del&gt;&lt;/a&gt;. However, in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74526&quot; title=&quot;Change stream opened against a secondary node uses a lot of CPU even when there is no write load&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74526&quot;&gt;&lt;del&gt;SERVER-74526&lt;/del&gt;&lt;/a&gt; we discovered that this change did not work correctly for $changeStream cursors opened against secondary nodes; rather than blocking, the change stream thread would wake up repeatedly and spin with high CPU utilization.&lt;/p&gt;

&lt;p&gt;The work for this ticket is to continue investigating the reason for this high CPU utilization on secondaries. Once we understand the problem better, we should reimplement &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69959&quot; title=&quot;Introduce majority committed point advancement notification mechanism&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69959&quot;&gt;&lt;del&gt;SERVER-69959&lt;/del&gt;&lt;/a&gt; in such a way that is not subject to the bug from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74526&quot; title=&quot;Change stream opened against a secondary node uses a lot of CPU even when there is no write load&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74526&quot;&gt;&lt;del&gt;SERVER-74526&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2279868">SERVER-74555</key>
            <summary>Re-introduce majority commit point advancement notification mechanism and use for change streams</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="denis.grebennicov@mongodb.com">Denis Grebennicov</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Mar 2023 18:15:57 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:25 +0000</updated>
                            <resolved>Fri, 21 Apr 2023 18:44:16 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5371022" author="xgen-internal-githook" created="Mon, 24 Apr 2023 16:15:23 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74555&quot; title=&quot;Re-introduce majority commit point advancement notification mechanism and use for change streams&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74555&quot;&gt;&lt;del&gt;SERVER-74555&lt;/del&gt;&lt;/a&gt; Re-introduce majority commit point advancement notification mechanism and use for change streams&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/07efe95e998e3f8305c4ec215761e0ec7b9e8012&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/07efe95e998e3f8305c4ec215761e0ec7b9e8012&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5366671" author="xgen-internal-githook" created="Fri, 21 Apr 2023 17:15:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74555&quot; title=&quot;Re-introduce majority commit point advancement notification mechanism and use for change streams&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74555&quot;&gt;&lt;del&gt;SERVER-74555&lt;/del&gt;&lt;/a&gt; Re-introduce majority commit point advancement notification mechanism and use for change streams&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0234b567d9bf6dad86d59127f23ef629b4eaa6cd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0234b567d9bf6dad86d59127f23ef629b4eaa6cd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5256561" author="kyle.suarez" created="Tue, 7 Mar 2023 19:54:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sebastien.mendez%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sebastien.mendez@mongodb.com&quot;&gt;sebastien.mendez@mongodb.com&lt;/a&gt;, sending this to your team to discuss re-scheduling this work. CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman@mongodb.com&quot;&gt;bernard.gorman@mongodb.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=denis.grebennicov%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;denis.grebennicov@mongodb.com&quot;&gt;denis.grebennicov@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
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