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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-55566] Expand invariant checks in ARM to accommodate resharding pipelines</title>
                <link>https://jira.mongodb.org/browse/SERVER-55566</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the oplog-tracking aggregation used by resharding &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be9e48ca06057da3aaeb776cd643cb1a1fc910d4/src/mongo/db/s/resharding/resharding_oplog_fetcher.cpp#L275&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;executes on a dedicated thread&lt;/a&gt;. This has some drawbacks, so we would like to change it to use the &lt;tt&gt;Pipeline&lt;/tt&gt; class and API instead. However, this requires a &lt;tt&gt;DocumentSourceMergeCursors&lt;/tt&gt; stage to be prepended to the pipeline, and at present there are some &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b590f02173505b3dbeda07b3cd0925c4ae41713c/src/mongo/s/query/async_results_merger.cpp#L583-L586&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariants which only expect to see a &lt;tt&gt;postBatchResumeToken&lt;/tt&gt; for a change stream&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Eventually we want to allow the ARM to handle either kind of &lt;tt&gt;postBatchResumeToken&lt;/tt&gt;. However, this will require further engineering effort on the &lt;tt&gt;mongoS&lt;/tt&gt; side and an expansion of the work carried out under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53534&quot; title=&quot;Support including postBatchResumeToken in cursor response for non-change streams aggregations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53534&quot;&gt;&lt;del&gt;SERVER-53534&lt;/del&gt;&lt;/a&gt; on the &lt;tt&gt;mongoD&lt;/tt&gt; side. In the short-term, we should relax these constraints to allow resharding &lt;tt&gt;postBatchResumeTokens&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1660621">SERVER-55566</key>
            <summary>Expand invariant checks in ARM to accommodate resharding pipelines</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>PM-234</label>
                            <label>needs-triage</label>
                    </labels>
                <created>Fri, 26 Mar 2021 18:18:46 +0000</created>
                <updated>Tue, 6 Dec 2022 01:28:37 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4246464" author="JIRAUSER1257467" created="Tue, 14 Dec 2021 12:33:39 +0000"  >&lt;p&gt;Pushing the Fix version to 6.0 Desired, this to allow time for a discussion with Max and agree on the implementation approach&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3930892" author="kyle.suarez" created="Tue, 13 Jul 2021 16:01:16 +0000"  >&lt;p&gt;After a discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; it is important to sharding that these changes be backportable to 5.0. I&apos;m requesting a backport as well.&lt;/p&gt;</comment>
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