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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-74526] Change stream opened against a secondary node uses a lot of CPU even when there is no write load</title>
                <link>https://jira.mongodb.org/browse/SERVER-74526</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The changes from &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; introduced a performance regression starting in 6.3 for change streams opened against a replica set secondary node. Let&apos;s assume that the system is completely idle, with no reads or writes being issued by clients. The client opens a &lt;tt&gt;$changeStream&lt;/tt&gt; against the idle system. The client&apos;s driver will issue &lt;tt&gt;getMore&lt;/tt&gt; operations against this cursor in a loop in order to watch for changes. The expected behavior is that the thread executing the &lt;tt&gt;$changeStream&lt;/tt&gt; will block on the server side waiting for inserts to the oplog. This thread should use very little CPU, since it waits on a condition variable rather than busy waiting.&lt;/p&gt;

&lt;p&gt;The changes from &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; appear to have caused the change stream thread to wake up far more often than it should. I added experimental logging to the server which showed that in 6.2, a change stream thread watching a secondary node of an idle system would wake up less than 10 times per second. For the same scenario in 6.3, however, the thread wakes up at least a few orders of magnitude more often. The consequence is that the change stream thread behaves effectively like it is busy waiting rather than blocking and has unreasonably high CPU utilization.&lt;/p&gt;

&lt;p&gt;Again, this happens only for change streams opened against secondary nodes, not for change streams opened against primary nodes. I speculate it has something to do with differing behavior between primary and secondary nodes for how we choose which timestamp to read from?&lt;/p&gt;</description>
                <environment></environment>
        <key id="2278982">SERVER-74526</key>
            <summary>Change stream opened against a secondary node uses a lot of CPU even when there is no write load</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Mar 2023 23:47:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:28 +0000</updated>
                            <resolved>Fri, 3 Mar 2023 15:59:31 +0000</resolved>
                                    <version>6.3.0-rc0</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.3.0-rc1</fixVersion>
                                    <component>Change streams</component>
                    <component>Query Execution</component>
                                        <votes>0</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="5245745" author="xgen-internal-githook" created="Fri, 3 Mar 2023 02:41:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &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; Fix high CPU utilization for a change streams opened against secondary nodes&lt;/p&gt;

&lt;p&gt;This reverts commit 34ac49477b87e183637f68cda828ecff8b393c64. Future&lt;br/&gt;
work is needed to reintroduce the changes from &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; without&lt;br/&gt;
causing the problematic &quot;busy wait&quot; behavior on secondary nodes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/67773ced2cb8c57935b9ea08331fe69bbc608d57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/67773ced2cb8c57935b9ea08331fe69bbc608d57&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5244843" author="xgen-internal-githook" created="Thu, 2 Mar 2023 19:47:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &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; Fix high CPU utilization for a change streams opened against secondary nodes&lt;/p&gt;

&lt;p&gt;This reverts commit 34ac49477b87e183637f68cda828ecff8b393c64. Future&lt;br/&gt;
work is needed to reintroduce the changes from &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; without&lt;br/&gt;
causing the problematic &quot;busy wait&quot; behavior on secondary nodes.&lt;br/&gt;
Branch: v6.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/96763fa1fef7faa2513afd2618d4d039ee70a6fe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/96763fa1fef7faa2513afd2618d4d039ee70a6fe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5244608" author="david.storch" created="Thu, 2 Mar 2023 18:24:30 +0000"  >&lt;p&gt;The proposed fix is to revert the changes from &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;. I filed &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; for the work of reintroducing the original change in such a way that is not subject to the high CPU utilization on secondaries problem.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Start a 2-node replica set. I&apos;m doing it like so:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ ./mongo --nodb&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; var rst = new ReplSetTest({nodes: 2}); rst.startSet(); rst.initiate();&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Then connect to the secondary node and start watching a change stream on an arbitrary non-existent collection:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ mongosh --port 20001&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.getMongo().setReadPref(&quot;secondary&quot;);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; var cursor = db.foo.watch();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; while (cursor.hasNext()) { printjson(cursor.next()); }&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;You should be able to see the secondary node&apos;s CPU utilization spike. The CPU will become idle again if you stop iterating the change stream cursor.&lt;/p&gt;</customfieldvalue>

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