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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-54094] Avoid taking strong lock on collection as part of donor shards in resharding choosing minFetchTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-54094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Donor shards taking a collection S lock in generateMinFetchTimestamp() on the collection being resharded is a heavy-handed way to wait for all earlier writes on the collection to have finished. Despite the intention to only block writes, in the absense of lock-free reads, the collection S lock would lead to readers also being block. This is because a collection IX lock request which queues up after the S lock request will cause any subsequent collection IS lock requests to also queue.&lt;/p&gt;

&lt;p&gt;Donor shards must guarantee after the minFetchTimestamp value that all oplog entries for writes on the collection being resharding contain a &quot;destinedRecipient&quot; field. An alternative approach would be (1) to wait for any prepared transactions to commit or abort and (2) to throw a WriteConflictException for any other write on the collection being resharded that started before the minFetchTimestamp value.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1602966">SERVER-54094</key>
            <summary>Avoid taking strong lock on collection as part of donor shards in resharding choosing minFetchTimestamp</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="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Jan 2021 01:13:28 +0000</created>
                <updated>Tue, 6 Dec 2022 01:36:54 +0000</updated>
                            <resolved>Sat, 12 Jun 2021 18:05:24 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
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