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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-30615] _configsvrShardCollection can retry upsert after getting writeConcern timeout and result in duplicate key error</title>
                <link>https://jira.mongodb.org/browse/SERVER-30615</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="415493">SERVER-30615</key>
            <summary>_configsvrShardCollection can retry upsert after getting writeConcern timeout and result in duplicate key error</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Aug 2017 15:18:06 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:25 +0000</updated>
                            <resolved>Thu, 14 Sep 2017 18:16:10 +0000</resolved>
                                    <version>3.5.11</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1673193" author="ramon.fernandez" created="Thu, 14 Sep 2017 19:11:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;DiannaHohensee&apos;, &apos;name&apos;: u&apos;Dianna Hohensee&apos;, &apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30615&quot; title=&quot;_configsvrShardCollection can retry upsert after getting writeConcern timeout and result in duplicate key error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30615&quot;&gt;&lt;del&gt;SERVER-30615&lt;/del&gt;&lt;/a&gt; Fix duplicate key error in shardCollection by using local read concern instead of majority&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1cbf344efcaa72453f96f27a770919ad93b0b4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1cbf344efcaa72453f96f27a770919ad93b0b4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1668281" author="renctan" created="Fri, 8 Sep 2017 18:16:51 +0000"  >&lt;p&gt;Per offline discussion, the direction we currently want to go is make reads use readConcern local.&lt;/p&gt;</comment>
                            <comment id="1663003" author="renctan" created="Fri, 1 Sep 2017 20:20:42 +0000"  >&lt;p&gt;I think I have found the problem. Sequence of events:&lt;/p&gt;

&lt;p&gt;1. configShardCollection begins&lt;br/&gt;
2. command performs query on config.database with readConcern majority (ShardingCatalogClientImpl::getDatabase -&amp;gt; ShardingCatalogClientImpl::_exhaustiveFindOnConfig)&lt;br/&gt;
3. For ShardLocal::_exhaustiveFindOnConfig, this effectively calls opCtx-&amp;gt;recoveryUnit()-&amp;gt;setReadFromMajorityCommittedSnapshot();&lt;br/&gt;
4. command tries to upsert the new config.collections document and succeeds.&lt;br/&gt;
5. command times out waiting for write concern. Shard::runBatchWriteCommand has built-in retry, so it retries the command&lt;br/&gt;
6. Triggers the duplicate key error since the fetcher didn&apos;t find the document and the update stage attempted to insert the document.&lt;/p&gt;

&lt;p&gt;The problem here is that the update in #4 and #6 were using the snapshot view, which was set by an earlier operation. Since the setting is the operationContext and the same one is being used through the entire command, the update will end up using the same setting unintentionally.&lt;/p&gt;</comment>
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            <issuekey id="413891">SERVER-30559</issuekey>
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