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    <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-34432] Allow $changeStream resume attempts to proceed if the initial stream documents have the same clusterTime as the resume token but lower-sorting UUIDs</title>
                <link>https://jira.mongodb.org/browse/SERVER-34432</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When determining whether it is possible to resume a change stream, we currently reject the resume attempt and uassert if a document observed in the stream has the same clusterTime but a different UUID than the resume token. However, in the case of the new whole-database and cluster-wide change streams running on a sharded cluster, this is a legitimate scenario; we may observe operations from multiple shards that occurred at the same time on different namespaces.&lt;/p&gt;

&lt;p&gt;To ensure correct resume semantics, we should continue to examine subsequent documents in the stream if the current document&apos;s UUID sorts before the resume token&apos;s, implying that we should expect to see the resume token later. However, if the document&apos;s UUID sorts &lt;b&gt;after&lt;/b&gt; the resume token&apos;s UUID, then we will never see the token and can safely reject the resume attempt.&lt;/p&gt;</description>
                <environment></environment>
        <key id="525974">SERVER-34432</key>
            <summary>Allow $changeStream resume attempts to proceed if the initial stream documents have the same clusterTime as the resume token but lower-sorting UUIDs</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Apr 2018 13:37:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:48 +0000</updated>
                            <resolved>Thu, 12 Apr 2018 22:27:04 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1863129" author="xgen-internal-githook" created="Thu, 12 Apr 2018 22:22:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34432&quot; title=&quot;Allow $changeStream resume attempts to proceed if the initial stream documents have the same clusterTime as the resume token but lower-sorting UUIDs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34432&quot;&gt;&lt;del&gt;SERVER-34432&lt;/del&gt;&lt;/a&gt; Allow $changeStream resume attempts to proceed if the initial stream documents have the same clusterTime as the resume token but lower-sorting UUIDs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f98c59b381c74d2e136b2cce1c4436c02ee64741&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f98c59b381c74d2e136b2cce1c4436c02ee64741&lt;/a&gt;&lt;/p&gt;</comment>
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