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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-31685] Sharded change streams can miss notifications</title>
                <link>https://jira.mongodb.org/browse/SERVER-31685</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When establishing a new change stream on a sharded collections, notifications can be missed until the stream has processed at least 1 notification from every shard.  This is because when a shard receives a changeStream request, it marks the start point of its local stream as the current replica set majority commit point.&lt;br/&gt;
So if the cursor on shard A gets established at time 5, shard B takes a write to the collection at time 6, then the change stream cursor gets established on shard B at time 7, now the sharded stream will return notifications 5 and 7, but will miss notification 6.&lt;/p&gt;</description>
                <environment></environment>
        <key id="449706">SERVER-31685</key>
            <summary>Sharded change streams can miss notifications</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Oct 2017 22:52:56 +0000</created>
                <updated>Mon, 30 Oct 2023 23:12:34 +0000</updated>
                            <resolved>Tue, 14 Nov 2017 16:58:16 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1724561" author="xgen-internal-githook" created="Mon, 13 Nov 2017 21:23:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;username&apos;: &apos;mtrussotto&apos;, &apos;email&apos;: &apos;matthew.russotto@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31685&quot; title=&quot;Sharded change streams can miss notifications&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31685&quot;&gt;&lt;del&gt;SERVER-31685&lt;/del&gt;&lt;/a&gt; Sharded change streams can miss notifications&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/634857247b51b1d8ce68530636579480c67f4d19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/634857247b51b1d8ce68530636579480c67f4d19&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1707154" author="charlie.swanson" created="Tue, 24 Oct 2017 13:40:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt;, I realized the first won&apos;t quite work out of the box, since you can open a change stream before the collection exists, but I think we could probably add an internal-only parameter to start at a ts, without a UUID or anything like that? We really just need all the oplog scans to agree on where to start.&lt;/p&gt;</comment>
                            <comment id="1706803" author="spencer" created="Mon, 23 Oct 2017 22:59:49 +0000"  >&lt;p&gt;The alternative is to change the ARM to throw out all results before the highest first ResumeToken received from any shard, but that seems likely to be more complex.&lt;/p&gt;</comment>
                            <comment id="1706802" author="spencer" created="Mon, 23 Oct 2017 22:56:47 +0000"  >&lt;p&gt;To fix this we can make all change stream cursors sent to shards on a sharded collection always use resumeAfter.  The resume token can be artificially constructed based on the mongos&apos; current cluster time and the collection UUID known from the sharding metadata.&lt;/p&gt;

&lt;p&gt;This may require opting-out of any validation checks that ensure that there is an exact match on the ResumeToken&lt;/p&gt;</comment>
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