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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-27510] Compare only epochs instead of full chunk versions in CollectionMetadata::checkChunkIsValid()</title>
                <link>https://jira.mongodb.org/browse/SERVER-27510</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The check on the shard that the chunk&apos;s version sent by the config is the same as what the shard sees is a little counter productive: we bump the version of a random chunk on the donor with every migration, so a chunk that hasn&apos;t even moved away and back might get rejected for a moveChunk or splitChunk.&lt;/p&gt;

&lt;p&gt;Instead, we should just compare the chunk&apos;s epochs to protect against moving a chunk on a collection that was dropped and recreated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="340726">SERVER-27510</key>
            <summary>Compare only epochs instead of full chunk versions in CollectionMetadata::checkChunkIsValid()</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Dec 2016 21:51:00 +0000</created>
                <updated>Wed, 5 Apr 2017 11:42:29 +0000</updated>
                            <resolved>Tue, 10 Jan 2017 15:57:48 +0000</resolved>
                                    <version>3.4.1</version>
                    <version>3.5.1</version>
                                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1473624" author="xgen-internal-githook" created="Tue, 10 Jan 2017 16:05:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;EshaMaharishi&apos;, u&apos;name&apos;: u&apos;Esha Maharishi&apos;, u&apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27510&quot; title=&quot;Compare only epochs instead of full chunk versions in CollectionMetadata::checkChunkIsValid()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27510&quot;&gt;&lt;del&gt;SERVER-27510&lt;/del&gt;&lt;/a&gt; remove chunk version check in moveChunk and splitChunk&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ebd851d55b58f83b8e2bdf27fd20540cc9285e7e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ebd851d55b58f83b8e2bdf27fd20540cc9285e7e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1473594" author="xgen-internal-githook" created="Tue, 10 Jan 2017 15:56:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;EshaMaharishi&apos;, u&apos;name&apos;: u&apos;Esha Maharishi&apos;, u&apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27510&quot; title=&quot;Compare only epochs instead of full chunk versions in CollectionMetadata::checkChunkIsValid()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27510&quot;&gt;&lt;del&gt;SERVER-27510&lt;/del&gt;&lt;/a&gt; remove chunk version check in moveChunk and splitChunk&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9ecd13e8bee07dea88e908d8e8d2f12239f1879&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9ecd13e8bee07dea88e908d8e8d2f12239f1879&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1471671" author="esha.maharishi@10gen.com" created="Fri, 6 Jan 2017 22:21:21 +0000"  >&lt;p&gt;Further note: The epochs are already compared from the shardVersion field, thus the entire check of comparing the chunkVersions can be removed (rather than changing the check to comparing only the chunkVersions&apos; epochs).&lt;/p&gt;</comment>
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            <issuekey id="309852">SERVER-25673</issuekey>
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            <issuekey id="307931">SERVER-25527</issuekey>
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            <issuekey id="343848">SERVER-27613</issuekey>
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