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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-45831] [4.0] Performance regression processing large aggregation commands</title>
                <link>https://jira.mongodb.org/browse/SERVER-45831</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Due to the backport of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43910&quot; title=&quot;include Client/OpCtx information in LockManager::dump() output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43910&quot;&gt;&lt;del&gt;SERVER-43910&lt;/del&gt;&lt;/a&gt;, all aggregation commands now call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/298e787a6587a708d147c5a1ebec5ca56c571b24/src/mongo/db/commands.cpp#L505&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BSONObj::toString() via redact()&lt;/a&gt; on execution. For large BSON objects, this&#160;is a very expensive operation.&lt;/p&gt;

&lt;p&gt;This performance regression will be most&#160;noticeable for large aggregation commands that execute quickly. This is not related to pipeline stages necessarily, but command object size. For example, $in on a large array will observe this regression.&lt;/p&gt;

&lt;p&gt;This is caused by the absence of changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35912&quot; title=&quot;Upgrade PipelineCmd and ClusterPipelineCmd to use TypedCommand&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35912&quot;&gt;&lt;del&gt;SERVER-35912&lt;/del&gt;&lt;/a&gt; in 4.0,&#160;which changed the inheritance of PipelineCommand &lt;a href=&quot;https://github.com/mongodb/mongo/commit/c27e72a4979b1b2ef241d23d2ad1434cdb3ff747#diff-264fb70c85a638c671570970f3752bf3L47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;from BasicCommand to Command&lt;/a&gt;.&#160;This performance regression does not exist in 4.2 and master because PipelineCommand does not inherit from BasicCommand, which calls into redact() and BSONObj::toString().&lt;/p&gt;</description>
                <environment></environment>
        <key id="1119283">SERVER-45831</key>
            <summary>[4.0] Performance regression processing large aggregation commands</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Jan 2020 21:50:24 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:47 +0000</updated>
                            <resolved>Wed, 29 Jan 2020 15:55:07 +0000</resolved>
                                    <version>4.0.15</version>
                                    <fixVersion>4.0.16</fixVersion>
                                                        <votes>0</votes>
                                    <watches>22</watches>
                                                                                                                <comments>
                            <comment id="2770525" author="benety.goh" created="Wed, 29 Jan 2020 15:55:07 +0000"  >&lt;p&gt;Removed command info from the LockManager DebugInfo field. See this commit:&lt;/p&gt;

&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43910&quot; title=&quot;include Client/OpCtx information in LockManager::dump() output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43910&quot;&gt;&lt;del&gt;SERVER-43910&lt;/del&gt;&lt;/a&gt; BasicCommand::Invocation sets LockManager DebugInfo&quot;&lt;br/&gt;
This reverts commit 41981ad8d67b3fc95da21506751cc5d284e724e1.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f718c0e820777c02af3577905876d63936a25d55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f718c0e820777c02af3577905876d63936a25d55&lt;/a&gt;&lt;/p&gt;</comment>
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