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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47422] Use NamespaceSerializer when taking distributed locks for refineCollectionShardKey and migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-47422</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Before executing, _configsvrRefineCollectionShardKey takes distributed locks on both a sharded collection&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1700c42daa8b88c17ca49814b7752b9a1b14d3db/src/mongo/db/s/config/configsvr_refine_collection_shard_key_command.cpp#L76-L85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;database and full namespace&lt;/a&gt;, the latter of which conflicts with the distributed lock a migration takes on a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1700c42daa8b88c17ca49814b7752b9a1b14d3db/src/mongo/db/s/balancer/migration_manager.cpp#L508-L514&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharded collection namespace&lt;/a&gt;. By default, taking a distributed lock times out after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1700c42daa/src/mongo/s/catalog/dist_lock_manager.cpp#L40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;20 seconds&lt;/a&gt; and has no fairness policy, so in the presence of many concurrent migrations, a shard key refine can time out waiting for a distributed lock and fail with LockBusy. To handle a similar problem, some config server DDL commands take a NamespaceSerializer lock before taking the distributed lock (e.g. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1700c42daa/src/mongo/db/s/config/configsvr_drop_collection_command.cpp#L118-L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_configsvrDropCollection&lt;/a&gt;). We should also be able to use the NamespaceSerializer here to avoid dist lock timeouts.&lt;/p&gt;

&lt;p&gt;If these changes are too invasive, we should instead modify the refineCollectionShardKey concurrency jstests (&quot;random_moveChunk_refine_collection_*.js&quot;) to retry refines that fail with a LockBusy error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1308518">SERVER-47422</key>
            <summary>Use NamespaceSerializer when taking distributed locks for refineCollectionShardKey and 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="matthew.saltz@mongodb.com">Matthew Saltz</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 8 Apr 2020 18:29:05 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:45 +0000</updated>
                            <resolved>Mon, 4 May 2020 15:21:35 +0000</resolved>
                                                    <fixVersion>4.4.0-rc6</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3079556" author="xgen-internal-githook" created="Mon, 11 May 2020 20:29:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;, &apos;username&apos;: &apos;saltzm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47422&quot; title=&quot;Use NamespaceSerializer when taking distributed locks for refineCollectionShardKey and migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47422&quot;&gt;&lt;del&gt;SERVER-47422&lt;/del&gt;&lt;/a&gt; Allow LockBusy errors in random_moveChunk_refine_collection_shard_key.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0350dc8d34a54e44cc600d35da06a0af59736f3b)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ffe1b8f80a00996f10cc098082bfb1a4be0c1e2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ffe1b8f80a00996f10cc098082bfb1a4be0c1e2f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3064666" author="xgen-internal-githook" created="Fri, 1 May 2020 15:56:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;, &apos;username&apos;: &apos;saltzm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47422&quot; title=&quot;Use NamespaceSerializer when taking distributed locks for refineCollectionShardKey and migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47422&quot;&gt;&lt;del&gt;SERVER-47422&lt;/del&gt;&lt;/a&gt; Allow LockBusy errors in random_moveChunk_refine_collection_shard_key.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0350dc8d34a54e44cc600d35da06a0af59736f3b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0350dc8d34a54e44cc600d35da06a0af59736f3b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1393123">SERVER-49145</issuekey>
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            <issuekey id="577430">SERVER-36322</issuekey>
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