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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55680] Generate, pin, and replicate minFetchTimestamp on donor shards in resharding atomically</title>
                <link>https://jira.mongodb.org/browse/SERVER-55680</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/268ee9dad3b1fbebe7ffc74a86a2de6d644b996e/src/mongo/db/s/resharding/resharding_donor_service.cpp#L350-L362&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Donor shards currently do two writes to generate, pin, and replicate the minFetchTimestamp value&lt;/a&gt;. First, donor shards write a no-op oplog entry and use its opTime as the minFetchTimestamp. Second, donor shards update the config.localReshardingOperations.donor document to set the minFetchTimestamp field. This two-step process can lead to cases where the generated opTime has already lagged behind the current oldest&amp;#95;timestamp value and has therefore become ineligible for pinning.&lt;/p&gt;

&lt;p&gt;repl::getNextOpTime() can be called within the WriteUnitOfWork to reserve an oplog slot. This oplog slot that can be used as the timestamp for the update to set the minFetchTimestamp field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1667320">SERVER-55680</key>
            <summary>Generate, pin, and replicate minFetchTimestamp on donor shards in resharding atomically</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="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>
                            <label>PM-234</label>
                    </labels>
                <created>Wed, 31 Mar 2021 22:16:13 +0000</created>
                <updated>Tue, 6 Dec 2022 01:27:38 +0000</updated>
                            <resolved>Tue, 26 Oct 2021 23:25:22 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4150144" author="max.hirschhorn@10gen.com" created="Tue, 26 Oct 2021 23:25:11 +0000"  >&lt;blockquote&gt;
&lt;p&gt;This two-step process can lead to cases where the generated opTime has already lagged behind the current oldest_timestamp value and has therefore become ineligible for pinning.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;It is unlikely for the generated opTime to be lagged behind the current oldest&amp;#95;timestamp due to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r5.0.3/src/mongo/db/snapshot_window_options.idl#L41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;minSnapshotHistoryWindowInSeconds defaulting to 5 minutes&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="1627521">SERVER-54610</issuekey>
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            <issuekey id="1673004">SERVER-55873</issuekey>
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            <issuekey id="1667319">SERVER-55679</issuekey>
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