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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-6296] improve aggregation framework concurrency implementation</title>
                <link>https://jira.mongodb.org/browse/SERVER-6296</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Revisit the concurrency options described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6123&quot; title=&quot;aggregation holds read lock indefinitely without yielding after initial processing of first sort or group stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6123&quot;&gt;&lt;del&gt;SERVER-6123&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
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        <key id="43331">SERVER-6296</key>
            <summary>improve aggregation framework concurrency implementation</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Jul 2012 04:45:17 +0000</created>
                <updated>Wed, 28 Oct 2015 04:26:22 +0000</updated>
                            <resolved>Mon, 22 Jul 2013 19:44:53 +0000</resolved>
                                                    <fixVersion>2.5.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>3</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="386435" author="redbeard0531" created="Mon, 22 Jul 2013 19:44:53 +0000"  >&lt;p&gt;Doc changes only needed if we already documented the locking behavior. If not, I think it makes sense to leave this as an undocumented internal implementation detail since there should be no behavior changes.&lt;/p&gt;</comment>
                            <comment id="386428" author="auto" created="Mon, 22 Jul 2013 19:42:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6296&quot; title=&quot;improve aggregation framework concurrency implementation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6296&quot;&gt;&lt;del&gt;SERVER-6296&lt;/del&gt;&lt;/a&gt; Batch fetching in DocumentSourceCursor&lt;/p&gt;

&lt;p&gt;The main win here is not grabbing and releasing the read lock for each&lt;br/&gt;
document to be processed.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8f0c10ec3f576b9c44213114ce8540f8a6698206&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8f0c10ec3f576b9c44213114ce8540f8a6698206&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="386421" author="redbeard0531" created="Mon, 22 Jul 2013 19:33:08 +0000"  >&lt;p&gt;The implementation is the same as described above, however the batchsizes are always 4MB (MaxBytesToReturnToClientAtOnce) regardless of the number of documents or any yielding done while fetching them.&lt;/p&gt;</comment>
                            <comment id="155425" author="redbeard0531" created="Tue, 21 Aug 2012 15:52:49 +0000"  >&lt;p&gt;Current plan is to hold read lock only while in DocumentSourceCursor and have it fetch documents in batches of ~100 or until first yield point (such as doc not in memory). It can then release the lock and pass that batch of results down the pipeline. I think this is the best way to handle both multithreading the processing of the pipeline and the need to take a writelock for $out.&lt;/p&gt;</comment>
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