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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1842] Handle migrate back case when previous migrate clean-up hasn&apos;t finished</title>
                <link>https://jira.mongodb.org/browse/SERVER-1842</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the clean up after a chunk migration waits for all cursors to be done before wiping out data.&lt;/p&gt;

&lt;p&gt;Here&apos;s a triggering sequence of events:&lt;/p&gt;

&lt;p&gt;shard0: has open cursor on chunk &lt;span class=&quot;error&quot;&gt;&amp;#91;low1.. high1&amp;#93;&lt;/span&gt;&lt;br/&gt;
shard0: moves chunk &lt;span class=&quot;error&quot;&gt;&amp;#91;low1..high1&amp;#93;&lt;/span&gt; to shard1&lt;br/&gt;
shard0: clean up after chunk moved delayed by open cursor&lt;br/&gt;
...&lt;br/&gt;
shard1: move chunk &lt;span class=&quot;error&quot;&gt;&amp;#91;low2..high2&amp;#93;&lt;/span&gt; to shard0, where &lt;span class=&quot;error&quot;&gt;&amp;#91;low2..high2&amp;#93;&lt;/span&gt; intercepts &lt;span class=&quot;error&quot;&gt;&amp;#91;low1..high1&amp;#93;&lt;/span&gt;&lt;br/&gt;
shard0: close cursor on chunk &lt;span class=&quot;error&quot;&gt;&amp;#91;low1..high1&amp;#93;&lt;/span&gt; while &lt;span class=&quot;error&quot;&gt;&amp;#91;low2...high2&amp;#93;&lt;/span&gt; is migrating&lt;br/&gt;
shard0: cleaning thread for &lt;span class=&quot;error&quot;&gt;&amp;#91;low1..high1&amp;#93;&lt;/span&gt; might touch &lt;span class=&quot;error&quot;&gt;&amp;#91;low2..high2&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;An example situation is show in auto2.js logging attached (although the last step didn&apos;t happen there)&lt;/p&gt;</description>
                <environment></environment>
        <key id="13166">SERVER-1842</key>
            <summary>Handle migrate back case when previous migrate clean-up hasn&apos;t finished</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="alerner">Alberto Lerner</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 Sep 2010 18:36:25 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:02 +0000</updated>
                            <resolved>Sat, 22 Jan 2011 00:11:18 +0000</resolved>
                                                    <fixVersion>1.7.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="22599" author="auto" created="Sat, 22 Jan 2011 00:11:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: don&apos;t allow a shard to be the TO of a migrate while its still cleaning up old data &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1842&quot; title=&quot;Handle migrate back case when previous migrate clean-up hasn&amp;#39;t finished&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1842&quot;&gt;&lt;del&gt;SERVER-1842&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84e7e2ce17c1d5a48c1cf8f468a6ce4c0d558097&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84e7e2ce17c1d5a48c1cf8f468a6ce4c0d558097&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="10467" name="auto2-Nightly_Linux_V8_64bit.txt" size="2821442" author="alerner" created="Thu, 23 Sep 2010 18:36:25 +0000"/>
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