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    <link>https://jira.mongodb.org</link>
    <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-36959] _shardServerShardCollection should use afterOpTime when counting chunks on the config server</title>
                <link>https://jira.mongodb.org/browse/SERVER-36959</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we shard a collection, _shardServerShardCollection runs a count command on the config.chunks collection to make sure there are no chunks already in the collection. But, right now, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/shardsvr_shard_collection.cpp#L372&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the count query uses readConcern local&lt;/a&gt;, which can cause a problem in the following scenario&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Create a sharded collection&lt;/li&gt;
	&lt;li&gt;Drop the sharded collection, which succeeds on the config server primary&lt;/li&gt;
	&lt;li&gt;Try to create a sharded collection with the same name&lt;/li&gt;
	&lt;li&gt;_shardServerShardCollection runs a count command to see if chunks exist from a previous sharded collection with the same name&lt;/li&gt;
	&lt;li&gt;The count command targets the config server secondary, where the replication of the drop from the previous collection has not completed, and so there are still chunks in the collection&lt;/li&gt;
	&lt;li&gt;The _shardServerShardCollection command fails with the error &quot;ManualInterventionRequired: A previous attempt to shard collection &amp;lt;collection name&amp;gt; failed after writing some initial chunks to config.chunks. Please manually delete the partially written chunks for collection test.user from config.chunks&quot;, even though the previous drop completed successfully&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We should use readAfterOpTime to do this count command so that even if we read from a config server secondary, we&apos;ll wait until previous operations have replicated. &lt;/p&gt;</description>
                <environment></environment>
        <key id="598138">SERVER-36959</key>
            <summary>_shardServerShardCollection should use afterOpTime when counting chunks on the config server</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 31 Aug 2018 16:20:38 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:30 +0000</updated>
                            <resolved>Wed, 26 Sep 2018 14:43:10 +0000</resolved>
                                    <version>4.0.2</version>
                                    <fixVersion>4.0.4</fixVersion>
                    <fixVersion>4.1.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2041162" author="xgen-internal-githook" created="Wed, 24 Oct 2018 21:33:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36959&quot; title=&quot;_shardServerShardCollection should use afterOpTime when counting chunks on the config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36959&quot;&gt;&lt;del&gt;SERVER-36959&lt;/del&gt;&lt;/a&gt; Use afterOpTime when counting chunks in _shardsvrShardCollection&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9732cc2ec75ead567015db7e892091ac3ce2e35d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/67a110a2bfb42aaca26933c4f5fffbf5edb418cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/67a110a2bfb42aaca26933c4f5fffbf5edb418cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2014845" author="xgen-internal-githook" created="Wed, 26 Sep 2018 14:42:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36959&quot; title=&quot;_shardServerShardCollection should use afterOpTime when counting chunks on the config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36959&quot;&gt;&lt;del&gt;SERVER-36959&lt;/del&gt;&lt;/a&gt; Use afterOpTime when counting chunks in _shardsvrShardCollection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9732cc2ec75ead567015db7e892091ac3ce2e35d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9732cc2ec75ead567015db7e892091ac3ce2e35d&lt;/a&gt;&lt;/p&gt;</comment>
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