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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-46370] Correctly maintain receiving chunks list after shard key refine</title>
                <link>https://jira.mongodb.org/browse/SERVER-46370</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For the non-resumable range deleter protocol, shards track chunks currently being received in a migration in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fd0ef1d0c67045de075f3ee6e9fd255f380807f2/src/mongo/db/s/metadata_manager.h#L262&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an in-memory map&lt;/a&gt;, removing the range when the migration succeeds or fails. There are at least two places where a refine during a migration (which can only happen if a migration runs without the distributed lock) can lead a range to incorrectly remain in this list after the migration aborts:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;When setting new filtering metadata in the MetadataManager, we clear entries&#160;from the receiving chunks list&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2bf81c1377b893511179f05f89194a777df450f4/src/mongo/db/s/metadata_manager.cpp#L191&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;that overlap with the new metadata&lt;/a&gt;. This comparison goes through the ChunkManager, which uses key strings to compare ranges,&#160;which doesn&apos;t work correctly for ranges with different numbers of fields, like after a refine.&lt;/li&gt;
	&lt;li&gt;In MigrationDestinationManager::_forgetReceive(), we don&apos;t remove a chunk from the receiving range list&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9aa9fa4a2844f0fe7890e01d621960a0c64607f6/src/mongo/db/s/migration_destination_manager.cpp#L1353&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if the epoch has changed&lt;/a&gt;. If there&apos;s a refine during the migration, this won&apos;t be correct and we may fail to clear the received range from receiving chunks.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1182123">SERVER-46370</key>
            <summary>Correctly maintain receiving chunks list 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="matthew.saltz@mongodb.com">Matthew Saltz</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Feb 2020 19:42:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:47 +0000</updated>
                            <resolved>Fri, 27 Mar 2020 00:33:14 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3021571" author="xgen-internal-githook" created="Wed, 1 Apr 2020 18:29:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;, &apos;username&apos;: &apos;saltzm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46370&quot; title=&quot;Correctly maintain receiving chunks list after shard key refine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46370&quot;&gt;&lt;del&gt;SERVER-46370&lt;/del&gt;&lt;/a&gt; Maintain _receivingChunks list correctly after shard key refine&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c5eea7753b2fe3082d853ff9400117c85ac42dab)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f088b63424736855b103bb0e4f6618837df0e4f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f088b63424736855b103bb0e4f6618837df0e4f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3003425" author="xgen-internal-githook" created="Thu, 26 Mar 2020 22:51:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Saltz&apos;, &apos;username&apos;: &apos;saltzm&apos;, &apos;email&apos;: &apos;matthew.saltz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46370&quot; title=&quot;Correctly maintain receiving chunks list after shard key refine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46370&quot;&gt;&lt;del&gt;SERVER-46370&lt;/del&gt;&lt;/a&gt; Maintain _receivingChunks list correctly after shard key refine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5eea7753b2fe3082d853ff9400117c85ac42dab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5eea7753b2fe3082d853ff9400117c85ac42dab&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1183260">SERVER-46386</issuekey>
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