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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-52924] Donor shards may create config.cache.chunks for temporary resharding collection after calculating their minFetchTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-52924</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;ProblemDescription&quot;&gt;&lt;/a&gt;Problem Description&lt;/h3&gt;
&lt;p&gt;Recipient shards expect to read from the donor shard&apos;s existing sharded collection and the config.cache.chunks collection of the temporary resharding collection using {&lt;tt&gt;atClusterTime: &amp;lt;fetchTimestamp&amp;gt;&lt;/tt&gt;}. Refreshing the temporary resharding collection on the donor shards causes them to create the config.cache.chunks.&amp;lt;database&amp;gt;.system.resharding.&amp;lt;existingUUID&amp;gt; collection. If this config.cache.chunks collection is created after the minFetchTimestamp, then the {&lt;tt&gt;atClusterTime: &amp;lt;fetchTimestamp&amp;gt;&lt;/tt&gt;} read on it would fail with a SnapshotUnavailable error response. (Or a NamespaceNotFound error response if the donor shards weren&apos;t also recipient shards.)&lt;/p&gt;

&lt;p&gt;Donor shards must instead create the config.cache.chunks for temporary resharding collection before calculating their minFetchTimestamp.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Solution&quot;&gt;&lt;/a&gt;Solution&lt;/h3&gt;
&lt;ul&gt;
	&lt;li&gt;Trigger a catalog cache refresh for the temporary resharding collection, on the DonorStateMachine, before calculating the fetchTimestamp.&lt;/li&gt;
	&lt;li&gt;Remove the refresh that&apos;s marked under this ticket&apos;s number as a TODO on the coordinator&apos;s state machine.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1544665">SERVER-52924</key>
            <summary>Donor shards may create config.cache.chunks for temporary resharding collection after calculating their minFetchTimestamp</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Wed, 18 Nov 2020 00:58:13 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:18 +0000</updated>
                            <resolved>Tue, 1 Dec 2020 20:00:57 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3510520" author="xgen-internal-githook" created="Tue, 1 Dec 2020 16:06:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52924&quot; title=&quot;Donor shards may create config.cache.chunks for temporary resharding collection after calculating their minFetchTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52924&quot;&gt;&lt;del&gt;SERVER-52924&lt;/del&gt;&lt;/a&gt; Refresh temporary collection on donor shard before creating minFetchTimestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9b15b5a07c8e47e9be4f886ce7c6076fd5c66e87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9b15b5a07c8e47e9be4f886ce7c6076fd5c66e87&lt;/a&gt;&lt;/p&gt;</comment>
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