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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>[COMPASS-6794] Investigate changes in PM-3020: Sharding metadata consistency check command</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6794</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Adding a new command to check for cluster wide sharding metadata consistency&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;We need a command or aggregation that users (and Atlas) can run to check that the collection metadata (e.g. UUIDs) is consistent across all shards.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;In the last months we have seen an increasing number of HELP tickets with the same issue: there was a sharded collection that had different UUID across shards. Usually, this sharded collection had different UUIDs because at some point the customer performed some operations directly against the shards, without going through a mongos. Despite the fact that PM-2689 will disallow direct operations against the shards, we see value in adding a way to verify that the collection metadata of a sharded collection is consistent across shards.&lt;/p&gt;

&lt;p&gt;The reason why this issue is spotted since 5.0 is that on that version we introduced the &lt;tt&gt;renameCollection&lt;/tt&gt; operation that verifies, before renaming the collection locally on a shard, that the local UUID matches the expected one.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/1HwoPXJYAp6KOaIZ6ZFSKXo6vj6dUZ8pVg1bWzp-afvo/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt; &lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/16m4FQC6GJ8vXZ1Spf_l8426T0dL9BQTxAurS14enNO8/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1IDjO0830q7wnx7Y48BamI9WjphvZVKwILM8oZPB7J_0/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1xkT4_IAqtTr6pVjnstbhdW8rAM-wFTM0ZxrUQFIbC9g/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Docs Update&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="2333452">COMPASS-6794</key>
            <summary>Investigate changes in PM-3020: Sharding metadata consistency check command</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Fri, 5 May 2023 15:28:09 +0000</created>
                <updated>Wed, 17 May 2023 13:27:28 +0000</updated>
                            <resolved>Wed, 17 May 2023 13:27:27 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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                            <issuelinktype id="10520">
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                                        <issuelink>
            <issuekey id="2316534">MONGOSH-1432</issuekey>
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