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    <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-9328] Race in migrate protocol can cause moveChunk cmd to hang</title>
                <link>https://jira.mongodb.org/browse/SERVER-9328</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Note: this can happen only if there are more than one migrations happening in a cluster (for example, when running moveChunk manually).&lt;/p&gt;

&lt;p&gt;Setup:&lt;br/&gt;
3 shards, 2 sharded collection&lt;/p&gt;

&lt;p&gt;Description of race:&lt;br/&gt;
1. move 1 chunk from shard1 to shard0.&lt;br/&gt;
2. migrate thread performing recvChunk in shard0, fails for some reason and terminates early, setting incoming migration active state to false.&lt;br/&gt;
3. move 1 chunk (ideally empty so it will be fast) from shard2 to shard0. This in effect, starts a new migration and changes the state to &apos;done&apos;.&lt;br/&gt;
4. shard1 calls _recvChunkStatus, and totally misses the transition to &apos;fail&apos; state, and sees the &apos;done&apos; state from migration at step#3, and it then keeps on looping until some other &lt;b&gt;slow&lt;/b&gt; migration begins and change the state to &quot;steady&quot;.&lt;/p&gt;

&lt;p&gt;Attaching patch that demonstrates this race.&lt;/p&gt;</description>
                <environment></environment>
        <key id="71504">SERVER-9328</key>
            <summary>Race in migrate protocol can cause moveChunk cmd to hang</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Apr 2013 15:42:54 +0000</created>
                <updated>Mon, 11 Jul 2016 17:57:22 +0000</updated>
                            <resolved>Mon, 8 Jul 2013 21:32:55 +0000</resolved>
                                    <version>2.4.1</version>
                                    <fixVersion>2.5.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="376557" author="auto" created="Mon, 8 Jul 2013 21:32:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9328&quot; title=&quot;Race in migrate protocol can cause moveChunk cmd to hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9328&quot;&gt;&lt;del&gt;SERVER-9328&lt;/del&gt;&lt;/a&gt; Race in migrate protocol can cause moveChunk cmd to hang&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a5e0a4f1659a1c8f30ffdfd2311babb318c62b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a5e0a4f1659a1c8f30ffdfd2311babb318c62b7&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="25864" name="patch" size="3232" author="randolph@mongodb.com" created="Thu, 11 Apr 2013 15:43:58 +0000"/>
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