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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-61487] Investigate retryability of the createIndexes command in mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-61487</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In sharded configurations, indexes are copied during chunk migrations. If there are no migrations, then there&apos;s no automatic mechanism to make indexes consistent across shards.&lt;/p&gt;

&lt;p&gt;There&apos;s a background thread that we can use to detect missing indexes. If there are, we&apos;d need to re-run the same createIndex command.&lt;/p&gt;

&lt;p&gt;This ticket should investigate whether mongos needs to internally retry the createIndexes on NotPrimary-esque errors or whether that should be left to the replicator.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1925364">SERVER-61487</key>
            <summary>Investigate retryability of the createIndexes command in mongos</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="gabriel.marks@mongodb.com">Gabriel Marks</assignee>
                                    <reporter username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</reporter>
                        <labels>
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                <created>Mon, 15 Nov 2021 15:54:46 +0000</created>
                <updated>Thu, 18 Nov 2021 16:21:41 +0000</updated>
                            <resolved>Thu, 18 Nov 2021 16:21:41 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4198185" author="JIRAUSER1253409" created="Thu, 18 Nov 2021 16:21:08 +0000"  >&lt;p&gt;We have come to the conclusion that the best plan is not to add any retry logic to mongos for now, but rather add the retry logic to the replicator. The reason for this is that we would have to add the retry logic to the replicator anyways, and also that there are plans (see scope of PM-2583) to build a DDL coordinator on a primary-only service for createIndexes in the near future which would handle this retrying more reliably than mongos.&lt;/p&gt;</comment>
                            <comment id="4189262" author="kaloian.manassiev" created="Mon, 15 Nov 2021 16:43:17 +0000"  >&lt;p&gt;There is no right answer here with how &lt;tt&gt;createIndexes&lt;/tt&gt; works currently. It does not synchronise with other create indexes or with moveChunk at a global level. Automatically retrying from MongoS is probably better customer experience, although it may cause some (poorly written) concurrency tests to fail based on what they were expecting previously with respect to failures.&lt;/p&gt;

&lt;p&gt;Also see PM-2583.&lt;/p&gt;</comment>
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