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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-78797] Fix calculation of latest shard placement version change timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-78797</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77506&quot; title=&quot;Sharded multi-document transactions can mismatch data and ShardVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77506&quot;&gt;&lt;del&gt;SERVER-77506&lt;/del&gt;&lt;/a&gt;&#160; we introduced CollectionMetadata::getShardMaxValidAfter() that should return the timestamp of the latest data placement change for this shard.&lt;/p&gt;

&lt;p&gt;Currently, this timestamp is calculated as the maximum &lt;a href=&quot;https://github.com/mongodb/mongo/blob/190a6693cc55e6902794e624e062d5c8f93d424a/src/mongo/s/catalog/type_chunk_base.idl#L43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;validAfter&lt;/a&gt; of all chunks currently owned by the given shard. This value does not represent the latest data placement change for the shard because it does not account for the last chunk donated by the shard.&lt;/p&gt;

&lt;p&gt;In fact the timestamp of the latest donated chunk is registered on the chunk itself that after the migration commit is not part anymore of the set of owned chunk by the donor shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2387153">SERVER-78797</key>
            <summary>Fix calculation of latest shard placement version change timestamp</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Jul 2023 07:55:49 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:32 +0000</updated>
                            <resolved>Wed, 12 Jul 2023 09:22:58 +0000</resolved>
                                    <version>7.1.0-rc0</version>
                    <version>7.0.0-rc6</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5559651" author="tommaso.tocci" created="Wed, 12 Jul 2023 09:22:58 +0000"  >&lt;p&gt;I&apos;ve looked more into this and figure out there is no bug, in fact the getShardMaxValidAfter should return a timestamp that is greater or equal to the last time the shard has received a chunk that it currently own.&lt;/p&gt;</comment>
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