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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-38975] Single-collection high water marks omit UUID on shards where the collection does not exist</title>
                <link>https://jira.mongodb.org/browse/SERVER-38975</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For single-collection change streams, high water mark tokens received from shards on which the collection does not exist will always omit the UUID. While these tokens function perfectly well for merging purposes, PBRTs returned to the client without the appropriate UUID cannot be used to resume the stream, since we cannot accurately determine the collection&apos;s default collation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="671924">SERVER-38975</key>
            <summary>Single-collection high water marks omit UUID on shards where the collection does not exist</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>Mon, 14 Jan 2019 14:22:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:10 +0000</updated>
                            <resolved>Sat, 2 Feb 2019 21:31:19 +0000</resolved>
                                    <version>4.1 Desired</version>
                                    <fixVersion>4.0.7</fixVersion>
                    <fixVersion>4.1.8</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2167362" author="xgen-internal-githook" created="Fri, 1 Mar 2019 14:56:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38975&quot; title=&quot;Single-collection high water marks omit UUID on shards where the collection does not exist&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38975&quot;&gt;&lt;del&gt;SERVER-38975&lt;/del&gt;&lt;/a&gt; Include UUID in high water marks from shards where the collection does not exist&lt;/p&gt;

&lt;p&gt;(cherry picked from commit fbb9daeb791d16c49b861d82c097cf9bd9daf07e)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9542a99354c7e9e6a2ec277b504a8ac94d285b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9542a99354c7e9e6a2ec277b504a8ac94d285b7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2136524" author="bernard.gorman" created="Mon, 4 Feb 2019 15:01:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.cottrell&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.cottrell&quot;&gt;nicholas.cottrell&lt;/a&gt;: it&apos;s relevant to cases where a &lt;tt&gt;$changeStream&lt;/tt&gt; is opened on an unsharded collection, OR on a sharded collection which does not exist on all shards (e.g. zoned sharding, or a newly-sharded collection which has not spread across the cluster yet). This is because &lt;tt&gt;$changeStream&lt;/tt&gt; always establishes cursors across all the shards, since (1) we need to watch for migrations to shards that do not yet own chunks, and (2) if we&apos;re resuming, the resume point may reside on a shard which no longer owns any chunks. Each shard on which the collection does not yet exist will return high water mark tokens with no UUID, so we must ensure that we populate these before returning them to the client.&lt;/p&gt;</comment>
                            <comment id="2136446" author="nicholas.cottrell" created="Mon, 4 Feb 2019 13:58:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt; - do I understand from the description that this change is &lt;em&gt;only&lt;/em&gt; relevant for cases where the customer is querying a non-sharded collection on a sharded cluster.&lt;/p&gt;

&lt;p&gt;If the collection is sharded and has documents on every shard, then&#160;this change will have no effect?&lt;/p&gt;</comment>
                            <comment id="2135953" author="xgen-internal-githook" created="Sat, 2 Feb 2019 21:30:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38975&quot; title=&quot;Single-collection high water marks omit UUID on shards where the collection does not exist&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38975&quot;&gt;&lt;del&gt;SERVER-38975&lt;/del&gt;&lt;/a&gt; Include UUID in high water marks from shards where the collection does not exist&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fbb9daeb791d16c49b861d82c097cf9bd9daf07e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fbb9daeb791d16c49b861d82c097cf9bd9daf07e&lt;/a&gt;&lt;/p&gt;</comment>
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