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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-53638] Enable pushdown of config.cache.chunks $lookup through $sort</title>
                <link>https://jira.mongodb.org/browse/SERVER-53638</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of a resharding operation we issue a pipeline with a $sort followed by a $lookup on config.cache.chunks. For efficiency and resumability, we need each shard to provide things in a sorted order and also perform the $lookup. Today this doesn&apos;t work because the $sort forces a split of a sharded pipeline and does not push the $lookup into the shards part. For this particular $lookup, we know it is safe to run it in parallel, so we should be able to push it into the shards pipeline.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1583451">SERVER-53638</key>
            <summary>Enable pushdown of config.cache.chunks $lookup through $sort</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>query-work-resharding</label>
                    </labels>
                <created>Thu, 7 Jan 2021 20:47:09 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:03 +0000</updated>
                            <resolved>Mon, 12 Apr 2021 04:37:42 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3710410" author="xgen-internal-githook" created="Fri, 9 Apr 2021 15:53:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53638&quot; title=&quot;Enable pushdown of config.cache.chunks $lookup through $sort&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53638&quot;&gt;&lt;del&gt;SERVER-53638&lt;/del&gt;&lt;/a&gt; Enable pushdown of config.cache.chunks $lookup through $sort&lt;/p&gt;

&lt;p&gt;Co-authored-by: Yuhong Zhang &amp;lt;danielzhangyh@gmail.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e967d6ed33cdf9eb8314e6ae3fb3e2261e213d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e967d6ed33cdf9eb8314e6ae3fb3e2261e213d7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3671726" author="charlie.swanson" created="Thu, 18 Mar 2021 17:33:51 +0000"  >&lt;p&gt;Uploaded my WIP:&#160;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/305532/305532_optimize_sort_lookup.patch&quot; title=&quot;optimize_sort_lookup.patch attached to SERVER-53638&quot;&gt;optimize_sort_lookup.patch&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;. I&apos;m going to hand this over to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yuhong.zhang&quot; class=&quot;user-hover&quot; rel=&quot;yuhong.zhang&quot;&gt;yuhong.zhang&lt;/a&gt;&#160;to put the finishing touches on, since I haven&apos;t found a lot of time to work on this recently.&#160;&lt;/p&gt;</comment>
                            <comment id="3553633" author="charlie.swanson" created="Thu, 7 Jan 2021 20:49:05 +0000"  >&lt;p&gt;Anyone who picks this up: be aware of some similar discussion of tradeoffs in&#160;&lt;a href=&quot;https://www.google.com/url?q=https://jira.mongodb.org/browse/SERVER-26442&amp;amp;sa=D&amp;amp;ust=1610055519939000&amp;amp;usg=AOvVaw0FvEjInjKrTKHCv8KIQnPW&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SERVER-26442&lt;/a&gt;. As always, we should try to avoid making things worse with this optimization.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1595956">SERVER-53940</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10520">
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                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="1754641">SERVER-57164</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1699775">SERVER-56583</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="320662">SERVER-26442</issuekey>
        </issuelink>
                            </inwardlinks>
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                <attachments>
                            <attachment id="305532" name="optimize_sort_lookup.patch" size="34196" author="charlie.swanson@mongodb.com" created="Thu, 18 Mar 2021 17:32:41 +0000"/>
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