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    <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-51510] Ensure that reshardingFields gets copied over from the enqueued to the persisted sharding metadata when combining CollAndChangedChunks structs</title>
                <link>https://jira.mongodb.org/browse/SERVER-51510</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Calling getChunksSince() on a shard &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L645-L689&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enqueues metadata to be persisted to-disk after retrieving from the config server&lt;/a&gt;. The shard then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L701-L707&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;re-fetches the shard&apos;s copy&lt;/a&gt; instead of preferring the config server&apos;s retrieved metadata.&lt;/p&gt;

&lt;p&gt;It&apos;s important to know that this enqueuing process is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L903-L913&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;asynchronous&lt;/a&gt;, so it&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L778-L781&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not guaranteed that the enqueued metadata will be immediately persisted&lt;/a&gt;. In order to account for this, retrieving the shard&apos;s metadata checks &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L781-L795&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;both the queue &lt;em&gt;and&lt;/em&gt; the persisted data&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It&apos;s possible for the enqueued metadata to be half-applied while the persisted metadata was being read. In order to account for this, the retrieval logic &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ccde38f1bd40d36e2dc3c2a361595abb63b53dbd/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L831-L850&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replaces all of the overlapping chunks&lt;/a&gt; from &lt;tt&gt;persisted&lt;/tt&gt; with the newer chunks from &lt;tt&gt;enqueued&lt;/tt&gt;. &lt;/p&gt;

&lt;p&gt;It&apos;s possible that the enqueued metadata has the collection entry&apos;s &lt;tt&gt;reshardingFields&lt;/tt&gt; filled out, while the persisted metadata does not have &lt;tt&gt;reshardingFields&lt;/tt&gt;. As a side-effect of the metadata overlap correction, &lt;tt&gt;reshardingFields&lt;/tt&gt; will be lost.&lt;/p&gt;

&lt;p&gt;This ticket is to simply copy/std::move &lt;tt&gt;reshardingFields&lt;/tt&gt; from &lt;tt&gt;enqueued&lt;/tt&gt; to &lt;tt&gt;persisted&lt;/tt&gt; in this case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1512107">SERVER-51510</key>
            <summary>Ensure that reshardingFields gets copied over from the enqueued to the persisted sharding metadata when combining CollAndChangedChunks structs</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M1</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Tue, 13 Oct 2020 02:06:32 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:04 +0000</updated>
                            <resolved>Thu, 15 Oct 2020 15:14:37 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3509588" author="max.hirschhorn@10gen.com" created="Tue, 1 Dec 2020 00:29:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51510&quot; title=&quot;Ensure that reshardingFields gets copied over from the enqueued to the persisted sharding metadata when combining CollAndChangedChunks structs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51510&quot;&gt;&lt;del&gt;SERVER-51510&lt;/del&gt;&lt;/a&gt; Ensure that reshardingFields gets copied over&lt;br/&gt;
 from the enqueued to the persisted sharding metadata when combining&lt;br/&gt;
 CollAndChangedChunks structs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c64fb000fa0931eab7482a5d775c7549280e61dc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c64fb000fa0931eab7482a5d775c7549280e61dc&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1494823">SERVER-51209</issuekey>
        </issuelink>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1555390">SERVER-53140</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1485184">SERVER-51109</issuekey>
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