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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-39081] createIndexes/shardCollection race condition in agg_out.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-39081</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;agg_out.js will occasionally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9dafb7a3e3bafa463ab5951189b670965995dada/jstests/concurrency/fsm_workloads/agg_out.js#L142-L144&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempt to create a shard key index on a shard output collection and then shard the collection&lt;/a&gt;. This operation can be performed by multiple threads concurrently. The index is required for collection sharding as the collection may have data.&lt;/p&gt;

&lt;p&gt;When 2 threads do attempt his concurrently, it is possible for the shardCollection command to fail due to missing shard key index. This can happen when:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Thread 1&lt;/b&gt;: Calls createIndex() to build the shard key index. Index build is started.&lt;br/&gt;
 &lt;b&gt;Thread 2&lt;/b&gt;: Calls createIndex(), which returns successfully as an index specification has been created for the in-progress index build.&lt;br/&gt;
 &lt;b&gt;Thread 2&lt;/b&gt;: Attempts to shard the collection. The shardCollection command fails as it does not see the in-progress index build (as it does not call listIndexes with the {includeIndexBuilds: true} option).&lt;/p&gt;

&lt;p&gt;We can fix this by moving index creation for the output collection to the FSM setup function.&lt;/p&gt;</description>
                <environment></environment>
        <key id="674809">SERVER-39081</key>
            <summary>createIndexes/shardCollection race condition in agg_out.js</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Jan 2019 16:18:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:59 +0000</updated>
                            <resolved>Fri, 18 Jan 2019 19:03:55 +0000</resolved>
                                    <version>4.1.7</version>
                                    <fixVersion>4.1.8</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2138339" author="xgen-internal-githook" created="Tue, 5 Feb 2019 17:14:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;James Wahlin&apos;, &apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38387&quot; title=&quot;agg_out.js concurrency workload always fails to shard the output collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38387&quot;&gt;&lt;del&gt;SERVER-38387&lt;/del&gt;&lt;/a&gt; agg_out.js concurrency workload always fails to shard the output collection&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9ed4ddae8b3c2aa7f876bdbfce00523c2b2a118c)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39081&quot; title=&quot;createIndexes/shardCollection race condition in agg_out.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39081&quot;&gt;&lt;del&gt;SERVER-39081&lt;/del&gt;&lt;/a&gt; Fix createIndexes/shardCollection race condition in agg_out.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit aad17aeba520f5c421716cb2d740057be96ce61a)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0aee7dae5a62206232223614cc95cb371e69070a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0aee7dae5a62206232223614cc95cb371e69070a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2136832" author="xgen-internal-githook" created="Mon, 4 Feb 2019 17:05:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;James Wahlin&apos;, &apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38387&quot; title=&quot;agg_out.js concurrency workload always fails to shard the output collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38387&quot;&gt;&lt;del&gt;SERVER-38387&lt;/del&gt;&lt;/a&gt; agg_out.js concurrency workload always fails to shard the output collection&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9ed4ddae8b3c2aa7f876bdbfce00523c2b2a118c)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39081&quot; title=&quot;createIndexes/shardCollection race condition in agg_out.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39081&quot;&gt;&lt;del&gt;SERVER-39081&lt;/del&gt;&lt;/a&gt; Fix createIndexes/shardCollection race condition in agg_out.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit aad17aeba520f5c421716cb2d740057be96ce61a)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/683afc244ee5104372190d29c6905a868cb6a78d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/683afc244ee5104372190d29c6905a868cb6a78d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2120755" author="xgen-internal-githook" created="Fri, 18 Jan 2019 19:03:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jameswahlin&apos;, &apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;name&apos;: &apos;James Wahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39081&quot; title=&quot;createIndexes/shardCollection race condition in agg_out.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39081&quot;&gt;&lt;del&gt;SERVER-39081&lt;/del&gt;&lt;/a&gt; Fix createIndexes/shardCollection race condition in agg_out.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aad17aeba520f5c421716cb2d740057be96ce61a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aad17aeba520f5c421716cb2d740057be96ce61a&lt;/a&gt;&lt;/p&gt;</comment>
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