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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-54566] Fixing the ShardServerCatalogCacheLoader behavior when handling an update metadata format task</title>
                <link>https://jira.mongodb.org/browse/SERVER-54566</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The goal of this ticket is to fix 3 minor issues introduced when working on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53104&quot; title=&quot;Ensure all shard-local cache collections of config.collections contain timestamps after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53104&quot;&gt;&lt;del&gt;SERVER-53104&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Do not assume that after an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b521f722e9f0555c230f338bcc78c99c220beacb/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L714-L735&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update metadata format task&lt;/a&gt; we will always have a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b521f722e9f0555c230f338bcc78c99c220beacb/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L737-L743&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;common task that updates some chunks&lt;/a&gt;. This is only true if the Chunks we got from the Config Server are more recent than the ones we have locally.&lt;/li&gt;
	&lt;li&gt;I found another minor bug when we compute the enqueued metadata CollAndChangedChunks: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b521f722e9f0555c230f338bcc78c99c220beacb/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L1458&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;at this point&lt;/a&gt; we shouldn&apos;t set the flag to false but propagate whatever value we have in &lt;tt&gt;task.updateMetadataFormat&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Finally, when we are patching-up (i.e. adding/removing the timestamp) the results that are going to be sent back to the CatalogCache, we need to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4dd10ec20b608ec364db1ba4815bbf45d73e8da4/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L916&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;first update the Collection Info&lt;/a&gt; and then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4dd10ec20b608ec364db1ba4815bbf45d73e8da4/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L912&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;patch-up the ChangedChunks&lt;/a&gt;, but we are doing it the other way around.&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="1623201">SERVER-54566</key>
            <summary>Fixing the ShardServerCatalogCacheLoader behavior when handling an update metadata format task</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Sat, 13 Feb 2021 14:45:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:27 +0000</updated>
                            <resolved>Tue, 16 Feb 2021 08:50:54 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3616591" author="xgen-internal-githook" created="Tue, 16 Feb 2021 08:45:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54566&quot; title=&quot;Fixing the ShardServerCatalogCacheLoader behavior when handling an update metadata format task&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54566&quot;&gt;&lt;del&gt;SERVER-54566&lt;/del&gt;&lt;/a&gt; Fixing the CatalogCacheLoader behavior when handling an update metadata format task&lt;/p&gt;

&lt;p&gt;It fixes 3 things:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Do not assume that after an update metadata format task there is&lt;br/&gt;
  always a common task that updates some chunks.&lt;/li&gt;
	&lt;li&gt;Minor bug computing the flag that specifies whether the results that&lt;br/&gt;
  are sent back to the CatalogCache must be patched-up.&lt;/li&gt;
	&lt;li&gt;Minor bug patching-up the results that are sent back.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/881a8d0ddad5a9209ca6083736ac6729183ff25e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/881a8d0ddad5a9209ca6083736ac6729183ff25e&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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