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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-45892] Index operations from 4.2 mongos shouldn&apos;t abort migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-45892</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44911&quot; title=&quot;Make index operations abort concurrent outgoing migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44911&quot;&gt;&lt;del&gt;SERVER-44911&lt;/del&gt;&lt;/a&gt;, an index operation (e.g. dropIndexes, createIndexes) will interrupt concurrent outgoing migrations. If a migration is interrupted in the critical section, it can lead to an fassert when the shard is running in FCV 4.2 (as described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45752&quot; title=&quot;opCtx interruption during migration critical section commit triggers fassert in FCV 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45752&quot;&gt;&lt;del&gt;SERVER-45752&lt;/del&gt;&lt;/a&gt;). This isn&apos;t a problem for index operations sent from a 4.4 binary mongos, because they will have a shard version and will wait for the critical section to complete. Operations from a 4.2 binary mongos (possible in a mixed version cluster) instead use the old protocol and are sent to all shards without a shard version, so they can bypass the critical section, interrupt a committing migration, and lead to the fassert.&lt;/p&gt;

&lt;p&gt;Instead, only index operations sent from a 4.4 mongos should abort migrations, which can be differentiated by checking if the command was sent with a shard version using &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d49d09e5950715b1c63d2fdec0e4a1a0dff031f8/src/mongo/db/s/operation_sharding_state.cpp#L64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OperationShardingState::isOperationVersioned()&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1122994">SERVER-45892</key>
            <summary>Index operations from 4.2 mongos shouldn&apos;t abort migrations</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jan 2020 22:28:59 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:42 +0000</updated>
                            <resolved>Wed, 12 Feb 2020 18:44:40 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2874605" author="xgen-internal-githook" created="Wed, 12 Feb 2020 18:38:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45892&quot; title=&quot;Index operations from 4.2 mongos shouldn&amp;#39;t abort migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45892&quot;&gt;&lt;del&gt;SERVER-45892&lt;/del&gt;&lt;/a&gt; Index operations from 4.2 mongos shouldn&apos;t abort migrations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37d1ef0d02582ac95a2adf835a341e0ead12abb3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37d1ef0d02582ac95a2adf835a341e0ead12abb3&lt;/a&gt;&lt;/p&gt;</comment>
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