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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-33869] make $changeStream on shards check shardVersion</title>
                <link>https://jira.mongodb.org/browse/SERVER-33869</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If an aggregate with $changeStream is sent to a shard, the shard will:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/commands/run_aggregate.cpp#L354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use AutoGetCollection&lt;/a&gt; to take a collection lock on the change stream&apos;s underlying namespace&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/commands/run_aggregate.cpp#L393&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use AutoGetCollectionForReadCommand&lt;/a&gt; to take a collection lock on the oplog (since &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/commands/run_aggregate.cpp#L354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;nss is reset to &quot;oplog.rs&quot; for change streams&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Since shard version checking is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/db_raii.cpp#L150&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;done in AutoGetCollectionForReadCommand&lt;/a&gt; but not AutoGetCollection, this means the changeStream on the shard does not check shardVersion for the change stream&apos;s underlying namespace, but for &quot;oplog.rs&quot;.&lt;/p&gt;

&lt;p&gt;This can be fixed by changing AutoGetCollection for change streams in runAggregate() to AutoGetCollectionForReadCommand, but may cause complications with currentOp and top output.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;, also would we want to backport this to 3.6?&lt;/p&gt;</description>
                <environment></environment>
        <key id="510914">SERVER-33869</key>
            <summary>make $changeStream on shards check shardVersion</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Mar 2018 03:03:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:47 +0000</updated>
                            <resolved>Thu, 22 Mar 2018 04:16:39 +0000</resolved>
                                    <version>3.7.2</version>
                                    <fixVersion>3.6.4</fixVersion>
                    <fixVersion>3.7.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1841575" author="xgen-internal-githook" created="Thu, 22 Mar 2018 04:15:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33869&quot; title=&quot;make $changeStream on shards check shardVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33869&quot;&gt;&lt;del&gt;SERVER-33869&lt;/del&gt;&lt;/a&gt; make $changeStream on shards check shardVersion&lt;/p&gt;

&lt;p&gt;(cherry picked from commit acaa16d190a0a5ef6a431e8a4b3eacd54a529ed7)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f655d53a9da6b58ff255c1885a55ffa1cfecfef4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f655d53a9da6b58ff255c1885a55ffa1cfecfef4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1841570" author="xgen-internal-githook" created="Thu, 22 Mar 2018 04:08:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33869&quot; title=&quot;make $changeStream on shards check shardVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33869&quot;&gt;&lt;del&gt;SERVER-33869&lt;/del&gt;&lt;/a&gt; make $changeStream on shards check shardVersion&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d4968620215d5d18720605514a765641c896538&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d4968620215d5d18720605514a765641c896538&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1833520" author="charlie.swanson" created="Wed, 14 Mar 2018 15:17:43 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt; I agree this should probably be backported. I&apos;ve checked the box &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
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