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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-75438] Persist rename coordinator document only after checking preconditions</title>
                <link>https://jira.mongodb.org/browse/SERVER-75438</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/518f98088c22598a12b33aa3457253d9fdcea0cc/src/mongo/db/s/rename_collection_coordinator.cpp#L177-L197&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;first checks&lt;/a&gt; part of the check precondition phase can be performed before even persisting the coordinator document similarly to the way the drop collection coordinator &lt;a href=&quot;https://github.com/mongodb/mongo/blob/70b22fa62fda2d5549ca200d86ca39b2602dce1b/src/mongo/db/s/drop_collection_coordinator.cpp#L143-L144&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks for preconditions&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2300748">SERVER-75438</key>
            <summary>Persist rename coordinator document only after checking preconditions</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="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="12300">Won&apos;t Do</resolution>
                                        <assignee username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Wed, 29 Mar 2023 12:53:32 +0000</created>
                <updated>Wed, 19 Apr 2023 14:58:13 +0000</updated>
                            <resolved>Wed, 19 Apr 2023 14:58:13 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5359210" author="marcos.grillo" created="Wed, 19 Apr 2023 14:58:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli@mongodb.com&quot;&gt;pierlauro.sciarelli@mongodb.com&lt;/a&gt; after having another look at the code, you&apos;re right, we need an steady state shard to perform the checks, closing this as won&apos;t do.&lt;/p&gt;</comment>
                            <comment id="5355767" author="marcos.grillo" created="Tue, 18 Apr 2023 14:48:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli@mongodb.com&quot;&gt;pierlauro.sciarelli@mongodb.com&lt;/a&gt; I think we could move some of the checks to the command as a fast path check to fail early, we&apos;ve used this pattern before, specially when we can fail early before holding locks or doing expensive operations.&lt;/p&gt;</comment>
                            <comment id="5355409" author="pierlauro.sciarelli" created="Tue, 18 Apr 2023 13:23:30 +0000"  >&lt;p&gt;I just realized that it is not possible to check the preconditions BEFORE persisting the coordinator document because we may end up not releasing the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7cc71f7d5f29a5850a4d186b9554df3dcb407117/src/mongo/db/s/rename_collection_coordinator.cpp#L250-L284&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;target critical section&lt;/a&gt; in case of crashes. Given that, I believe we should close this ticket also because it&apos;s a very tiny and irrelevant performance improvement.&lt;/p&gt;</comment>
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