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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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<item>
            <title>[SERVER-37501] Version multi-updates and multi-deletes in sharded transactions</title>
                <link>https://jira.mongodb.org/browse/SERVER-37501</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, mongos sends updates and deletes that target more than one shard &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/s/write_ops/write_op.cpp#L77-L79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;to all shards&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/s/write_ops/write_op.cpp#L92-L95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;without shard versions&lt;/a&gt;&#160;because normally mongos can&apos;t retry partial failures from stale shard version errors. In a transaction, mongos can retry on partial failures (or abort the writes entirely on each shard), so the router should be able to version writes that target more than one shard.&lt;/p&gt;

&lt;p&gt;This prevents the scenario where mongos starts a transaction on a collection it is stale for with an unversioned write, which acquires a lock on the stale collection and holds it for the lifetime of the transaction, preventing the shard from refreshing its filtering metadata for the stale collection until the transaction completes (because the refresh &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L180-L181&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;requires an exclusive lock on the stale collection&lt;/a&gt;). In this case, any stale versioned writes would hang waiting for the transaction to finish when the shard tries to refresh its metadata.&lt;/p&gt;</description>
                <environment></environment>
        <key id="614844">SERVER-37501</key>
            <summary>Version multi-updates and multi-deletes in sharded transactions</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="13201">Fixed</resolution>
                                        <assignee username="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>ShardedTxn:RouterSupport</label>
                    </labels>
                <created>Fri, 5 Oct 2018 21:39:53 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:35 +0000</updated>
                            <resolved>Wed, 28 Nov 2018 04:31:28 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2073747" author="xgen-internal-githook" created="Wed, 28 Nov 2018 04:29:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37501&quot; title=&quot;Version multi-updates and multi-deletes in sharded transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37501&quot;&gt;&lt;del&gt;SERVER-37501&lt;/del&gt;&lt;/a&gt; Version multi-updates and multi-deletes in sharded transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd7dfafb0ec103ac9a1c02489e8a99b32c509bdd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd7dfafb0ec103ac9a1c02489e8a99b32c509bdd&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="614854">SERVER-37502</issuekey>
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