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    <title>MongoDB Jira</title>
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    <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-38758] Avoid restarting $lookup from the top if a stale version error is encountered during a single lookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-38758</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a $lookup is reading from a sharded collection it will go through the normal shard versioning procedure to establish cursors on all the shards so that everyone agrees on a point-in-time of ownership across the cluster. During this establishment one of the shards may return a stale version error to the $lookup stage. The $lookup stage does not have any logic to handle that error, refresh the sharding catalog cache used for targeting, and retry the cursor establishment. This logic does exist, but the error is retried all the way at the top of the aggregate command, not the $lookup itself. This ticket tracks the work to handle this error and retry within the $lookup itself.&lt;/p&gt;

&lt;p&gt;In order to share the retry logic with $graphLookup, we think the best place to implement this would be somewhere inside of attachCursorSourceToPipeline.&lt;/p&gt;</description>
                <environment></environment>
        <key id="660368">SERVER-38758</key>
            <summary>Avoid restarting $lookup from the top if a stale version error is encountered during a single lookup</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Dec 2018 22:46:37 +0000</created>
                <updated>Tue, 6 Dec 2022 03:09:52 +0000</updated>
                            <resolved>Wed, 26 Feb 2020 16:04:35 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2886646" author="nicholas.zolnierz" created="Thu, 20 Feb 2020 15:21:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; I think we&apos;ll get this for free once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45538&quot; title=&quot;Implement and test shard version retry logic for $unionWith sub-pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45538&quot;&gt;&lt;del&gt;SERVER-45538&lt;/del&gt;&lt;/a&gt; lands?&lt;/p&gt;</comment>
                            <comment id="2126104" author="ian.boros" created="Thu, 24 Jan 2019 17:12:52 +0000"  >&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;note to self&amp;#93;&lt;/span&gt; This is purely an optimization. We just want to avoid restarting an entire aggregation when one &quot;sub lookup&quot; fails due StaleShardVersion error. (3)&lt;/p&gt;</comment>
                            <comment id="2099045" author="charlie.swanson" created="Fri, 21 Dec 2018 22:47:24 +0000"  >&lt;p&gt;Marking this as depends on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38728&quot; title=&quot;Allow pipeline with $lookup into a sharded collection to run on mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38728&quot;&gt;&lt;del&gt;SERVER-38728&lt;/del&gt;&lt;/a&gt; not because of a hard or logical dependency, but rather because I believe &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38728&quot; title=&quot;Allow pipeline with $lookup into a sharded collection to run on mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38728&quot;&gt;&lt;del&gt;SERVER-38728&lt;/del&gt;&lt;/a&gt; will move around a lot of code that will need to be changed for this ticket, and the merge conflicts will be nasty.&lt;/p&gt;</comment>
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            <issuekey id="658989">SERVER-38728</issuekey>
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