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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-74716] Prevent &quot;back-in-time&quot; change stream resume token on MongoS</title>
                <link>https://jira.mongodb.org/browse/SERVER-74716</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongoS will crash with an invariant failure when:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The initial resume token expected by mongoS is the split event fragment.&lt;/li&gt;
	&lt;li&gt;On the shards, DSCSCheckResumability lets the base event through expecting it to be split.&lt;/li&gt;
	&lt;li&gt;But there is no split stage, and the base event is returned to mongoS directly as-is.&lt;/li&gt;
	&lt;li&gt;But the event&apos;s resume token is BEFORE the split, so mongoS has gone back-in-time.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2284728">SERVER-74716</key>
            <summary>Prevent &quot;back-in-time&quot; change stream resume token on MongoS</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="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Mar 2023 12:02:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:09 +0000</updated>
                            <resolved>Mon, 27 Mar 2023 12:05:48 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5557358" author="xgen-internal-githook" created="Tue, 11 Jul 2023 14:21:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Serhii Lysenko&apos;, &apos;email&apos;: &apos;serhii.lysenko@mongodb.com&apos;, &apos;username&apos;: &apos;serhiitea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71828&quot; title=&quot;Add $changeStreamSplitLargeEvent stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71828&quot;&gt;&lt;del&gt;SERVER-71828&lt;/del&gt;&lt;/a&gt; Add $changeStreamSplitLargeEvent stage&lt;/p&gt;

&lt;p&gt;This change is a part of PM-2677 backport.&lt;br/&gt;
It includes the following changes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71828&quot; title=&quot;Add $changeStreamSplitLargeEvent stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71828&quot;&gt;&lt;del&gt;SERVER-71828&lt;/del&gt;&lt;/a&gt; Add $changeStreamSplitLargeEvent stage&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74301&quot; title=&quot;Optimize serialization behavior for $changeStreamSplitLargeEvent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74301&quot;&gt;&lt;del&gt;SERVER-74301&lt;/del&gt;&lt;/a&gt; Optimize serialization behavior for $changeStreamSplitLargeEvent&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74716&quot; title=&quot;Prevent &amp;quot;back-in-time&amp;quot; change stream resume token on MongoS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74716&quot;&gt;&lt;del&gt;SERVER-74716&lt;/del&gt;&lt;/a&gt; Require splitEvent stage for splitEvent token&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67699&quot; title=&quot;Add tracking for when change stream event exceeds 16Mb&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67699&quot;&gt;&lt;del&gt;SERVER-67699&lt;/del&gt;&lt;/a&gt; Implement changeStreamsLargeEventsFailedCounter&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55a7d7985b2377d3c45364220e625e39d1e76b99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55a7d7985b2377d3c45364220e625e39d1e76b99&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5498315" author="xgen-internal-githook" created="Wed, 14 Jun 2023 13:20:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74716&quot; title=&quot;Prevent &amp;quot;back-in-time&amp;quot; change stream resume token on MongoS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74716&quot;&gt;&lt;del&gt;SERVER-74716&lt;/del&gt;&lt;/a&gt; Move resolveResumeTokenFromSpec() into a separate library&lt;/p&gt;

&lt;p&gt;Move the resolveResumeTokenFromSpec() function to a separate library,&lt;br/&gt;
so that it can be used outside of change_stream_pipeline library.&lt;/p&gt;

&lt;p&gt;This change is a part of PM-2677 backport.&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/997ef16d31e7b535ba0342da8b820944292b714e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/997ef16d31e7b535ba0342da8b820944292b714e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5300182" author="xgen-internal-githook" created="Fri, 24 Mar 2023 21:54:54 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74716&quot; title=&quot;Prevent &amp;quot;back-in-time&amp;quot; change stream resume token on MongoS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74716&quot;&gt;&lt;del&gt;SERVER-74716&lt;/del&gt;&lt;/a&gt; Require splitEvent stage for splitEvent token&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0127ea7f63f4fa80a77ca77a306e2a50e73101ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0127ea7f63f4fa80a77ca77a306e2a50e73101ac&lt;/a&gt;&lt;/p&gt;</comment>
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