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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-23678] Cached minor shard version does not match that of the persistent config metadata after moveChunk</title>
                <link>https://jira.mongodb.org/browse/SERVER-23678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After the &lt;tt&gt;moveChunk&lt;/tt&gt; command is run on a shard it will first bump the major version of the chunk it donated to a value that&apos;s greater than all chunks in the collection. When the migration completes, it will will bump both the major and minor versions of one other chunk in order to indicate to incoming requests that it no longer owns the donated chunk.&lt;/p&gt;

&lt;p&gt;Because of the way the metadata cache is maintained, even though we write the new chunk version to the metadata, it does not get reflected in the shard&apos;s metadata cache. The problem is reproduced by the attached .js test, which runs split/move/mergeChunk commands and compares the cached metadata against what is written on the server and this test fails at the moveChunk step.&lt;/p&gt;

&lt;p&gt;This does not constitute an actual correctness problem, because minor shard version differences do not require retargeting, but is confusing when inspecting the cached metadata state, so we should fix it.&lt;/p&gt;

&lt;p&gt;The bug is reproducible in 3.0, 3.2 and 3.3.&lt;/p&gt;</description>
                <environment></environment>
        <key id="279372">SERVER-23678</key>
            <summary>Cached minor shard version does not match that of the persistent config metadata after moveChunk</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Apr 2016 14:09:56 +0000</created>
                <updated>Tue, 19 Jul 2016 17:04:05 +0000</updated>
                            <resolved>Wed, 29 Jun 2016 16:33:01 +0000</resolved>
                                    <version>3.0.11</version>
                    <version>3.2.4</version>
                    <version>3.3.4</version>
                                    <fixVersion>3.3.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1307813" author="xgen-internal-githook" created="Mon, 27 Jun 2016 18:41:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23678&quot; title=&quot;Cached minor shard version does not match that of the persistent config metadata after moveChunk&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23678&quot;&gt;&lt;del&gt;SERVER-23678&lt;/del&gt;&lt;/a&gt; adding check that minor version updates correctly after moveChunk with remaining chunk(s)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f090b41e87f9c3a2978d6ce42a01e7ee06053c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f090b41e87f9c3a2978d6ce42a01e7ee06053c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1287919" author="kaloian.manassiev" created="Wed, 8 Jun 2016 15:00:25 +0000"  >&lt;p&gt;Yes, this sounds like a more appropriate solution instead of introducing a new test.&lt;/p&gt;</comment>
                            <comment id="1287118" author="dianna.hohensee" created="Tue, 7 Jun 2016 21:15:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I&apos;m thinking it might be sufficient to add&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;assert.eq(1, newVersion.i, &quot;The minor value in the shard version should be 1&quot;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;right here: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/sharding/migration_failure.js#L68&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/jstests/sharding/migration_failure.js#L68&lt;/a&gt; and not add a whole new JS test. I modified migation_failure.js a bit ago to pull out and check the shardVersion when I was fixing something for CommitChunkMigration.&lt;/p&gt;</comment>
                            <comment id="1277788" author="dianna.hohensee" created="Fri, 27 May 2016 16:57:50 +0000"  >&lt;p&gt;Could also add an update to migration_failure.js to check the minor version after a successful migration with control chunk.&lt;/p&gt;</comment>
                            <comment id="1276411" author="dianna.hohensee" created="Thu, 26 May 2016 15:58:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22659&quot; title=&quot;Implement commitChunkMigration command on the config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22659&quot;&gt;&lt;del&gt;SERVER-22659&lt;/del&gt;&lt;/a&gt; will fix this in master as a result of moving new version generation to the config. Will put in the JS test after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22659&quot; title=&quot;Implement commitChunkMigration command on the config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22659&quot;&gt;&lt;del&gt;SERVER-22659&lt;/del&gt;&lt;/a&gt; gets the CommitChunkMigration command in.&lt;/p&gt;

&lt;p&gt;3.2 and 3.0 branches will need separate fixes.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="265895">SERVER-22659</issuekey>
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                            <attachment id="117589" name="cached_shard_metadata_matches_config.js" size="3935" author="kaloian.manassiev@mongodb.com" created="Wed, 13 Apr 2016 14:11:05 +0000"/>
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