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    <title>MongoDB Jira</title>
    <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-86116] CreateCollectionCoordinator may fail to create the chunk metadata on commit time.</title>
                <link>https://jira.mongodb.org/browse/SERVER-86116</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80363&quot; title=&quot;server default writeConcern is not honored when wtimeout is set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80363&quot;&gt;&lt;del&gt;SERVER-80363&lt;/del&gt;&lt;/a&gt; introduced changes to the way the write concern for a batch write request has to be applied. This introduced a regression in the execution of a &lt;tt&gt;shardCollection&lt;/tt&gt; operation, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/439345fe588765f35dcc06ffdc79e14d8b64c047/src/mongo/db/s/create_collection_coordinator.cpp#L303-L319&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends&lt;/a&gt; a &lt;tt&gt;BatchedCommandRequest&lt;/tt&gt; to the config server for committing the chunk list of the targeted namespace: since such a logic sets the majority write concern on the request object &lt;a href=&quot;https://github.com/mongodb/mongo/blob/439345fe588765f35dcc06ffdc79e14d8b64c047/src/mongo/db/s/create_collection_coordinator.cpp#L331-L342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;without also configuring&lt;/a&gt; the &lt;tt&gt;opCtx&lt;/tt&gt; used for its submission, the config server ends up applying the &lt;tt&gt;w:1&lt;/tt&gt; default value.&lt;/p&gt;

&lt;p&gt;This may lead to a situation of metadata inconsistency on the config server through the following sequence:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;tt&gt;createCollectionCoordinator&lt;/tt&gt; requests the creation of the collections chunks through &lt;tt&gt;BatchedCommandRequest&lt;/tt&gt; as the 1st step of the DDL commit&lt;/li&gt;
	&lt;li&gt;the config server performs the batch write and returns an OK result to the coordinator as soon as writes are persisted by the primary node&lt;/li&gt;
	&lt;li&gt;the config server steps down before step 1 gets replicated; the list of chunks gets hence rolled back&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;createCollectionCoordinator&lt;/tt&gt; receives the OK about step 1, and proceed to commit the rest of the metadata on the config server (subsequents requests are server by the new CSRS primary)&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;createCollectionCoordinator&lt;/tt&gt; considers the metadata commit as complete, but at the first attempt of refreshing its cached copy of the routing table it will detect the inconsistency.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2564920">SERVER-86116</key>
            <summary>CreateCollectionCoordinator may fail to create the chunk metadata on commit time.</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="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Feb 2024 11:20:15 +0000</created>
                <updated>Wed, 7 Feb 2024 16:11:50 +0000</updated>
                            <resolved>Wed, 7 Feb 2024 16:04:43 +0000</resolved>
                                    <version>7.0.5</version>
                                    <fixVersion>7.0.6</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="6075493" author="xgen-internal-githook" created="Wed, 7 Feb 2024 16:11:50 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;ppolato&apos;, &apos;email&apos;: &apos;82828243+ppolato@users.noreply.github.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-86116&quot; title=&quot;CreateCollectionCoordinator may fail to create the chunk metadata on commit time.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-86116&quot;&gt;&lt;del&gt;SERVER-86116&lt;/del&gt;&lt;/a&gt; Fix write concern configuration on insertChunks() helper of CreateCollectionCoordinator (#18686)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 0c8994973c924987453c1f4beff3809aaf14bc01&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/88d229cdeef6ba9dbb115550cceee0e87162facb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/88d229cdeef6ba9dbb115550cceee0e87162facb&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2424945">SERVER-80363</issuekey>
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