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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-48198] Migration recovery may recover incorrect decision after shard key refine</title>
                <link>https://jira.mongodb.org/browse/SERVER-48198</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a new primary steps up in a shardsvr replica set, it launches a task to recover any migrations driven by the node&apos;s shard that were in-progress when the previous primary stepped down. As part of this, the recovery process will recover the outcome of each migration by loading the latest metadata from the config server and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b2384a85f62431d88ac01067ae4d1d3dbb4fede5/src/mongo/db/s/migration_util.cpp#L888&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checking if the minimum bound from the migration still belongs to the donor shard&lt;/a&gt;. If it does, the migration is assumed to have aborted, and the recovery process updates the persisted range deleter state on the donor and recipient shards so any orphans on either are deleted.&lt;/p&gt;

&lt;p&gt;If an interrupted migration committed successfully and its namespace had its shard key refined before the recovery process runs, the check for ownership will use the &lt;b&gt;pre-refine minimum boundary&lt;/b&gt; but a &lt;b&gt;post-refine routing table&lt;/b&gt;. This may result in a spurious overlap, which leads the recovery process to incorrectly decide the migration aborted, preventing any orphans on the donor from being cleaned up. The recipient will attempt to schedule a range deletion for the received range, which will fail with RangeOverlapConflict.&lt;/p&gt;

&lt;p&gt;To fix this, the recovery process should extend the migration&apos;s min bound when performing the ownership check if the most recent shard key has more fields, like what was done in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46386&quot; title=&quot;Refining a shard key may lead to an orphan range never being cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46386&quot;&gt;&lt;del&gt;SERVER-46386&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1350296">SERVER-48198</key>
            <summary>Migration recovery may recover incorrect decision after shard key refine</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 May 2020 19:49:48 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:14 +0000</updated>
                            <resolved>Thu, 14 May 2020 22:01:28 +0000</resolved>
                                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3089060" author="xgen-internal-githook" created="Fri, 15 May 2020 02:03:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48198&quot; title=&quot;Migration recovery may recover incorrect decision after shard key refine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48198&quot;&gt;&lt;del&gt;SERVER-48198&lt;/del&gt;&lt;/a&gt; Account for extended range bounds when recovering migration decision&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9d8eb69d583b89682520ec58595e558d5f6cc9a2)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7d4d1ebeaeee37d743ad65099702bf27a12d7d33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7d4d1ebeaeee37d743ad65099702bf27a12d7d33&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3088865" author="xgen-internal-githook" created="Thu, 14 May 2020 21:58:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48198&quot; title=&quot;Migration recovery may recover incorrect decision after shard key refine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48198&quot;&gt;&lt;del&gt;SERVER-48198&lt;/del&gt;&lt;/a&gt; Account for extended range bounds when recovering migration decision&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d8eb69d583b89682520ec58595e558d5f6cc9a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d8eb69d583b89682520ec58595e558d5f6cc9a2&lt;/a&gt;&lt;/p&gt;</comment>
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