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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-47688] &quot;distinct&quot; supports snapshot reads on secondaries (mongod)</title>
                <link>https://jira.mongodb.org/browse/SERVER-47688</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1324558">SERVER-47688</key>
            <summary>&quot;distinct&quot; supports snapshot reads on secondaries (mongod)</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Apr 2020 18:02:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:13 +0000</updated>
                            <resolved>Thu, 30 Apr 2020 16:12:42 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3063944" author="lingzhi.deng" created="Fri, 1 May 2020 03:17:06 +0000"  >&lt;p&gt;I think it is because&#160;&quot;distinct&quot; already&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/98427b7a2228f6a8d54475adc9df3991c1c60314/src/mongo/db/commands/distinct.cpp#L91-L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;allows&quot; snapshot readConcern&lt;/a&gt;. And my patch made &quot;distinct&quot; return true for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8ced6df8f620daaa2e539f192f2eef356c63e9c/src/mongo/db/commands/distinct.cpp#L96-L98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;shouldAffectReadConcernCounter&lt;/tt&gt;&lt;/a&gt; so it is counted toward the metrics. And I think it just works for non-sharded collections for both transactions and non-transactions as long as we set the timestamp readSource correctly.&lt;/p&gt;</comment>
                            <comment id="3063917" author="jesse" created="Fri, 1 May 2020 02:47:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt; did you figure out why &quot;distinct&quot; seems to update serverStatus metrics without making any code changes to implement that behavior?&lt;/p&gt;</comment>
                            <comment id="3062428" author="xgen-internal-githook" created="Thu, 30 Apr 2020 13:56:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47688&quot; title=&quot;&amp;quot;distinct&amp;quot; supports snapshot reads on secondaries (mongod)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47688&quot;&gt;&lt;del&gt;SERVER-47688&lt;/del&gt;&lt;/a&gt; Enable snapshot &quot;distinct&quot; command&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3684f6c9461b89d9ff63a163b32b6e317fb80dd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3684f6c9461b89d9ff63a163b32b6e317fb80dd1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3060948" author="lingzhi.deng" created="Wed, 29 Apr 2020 17:34:11 +0000"  >&lt;p&gt;Hmm, in my currently open CR, I have a test for &quot;distinct&quot; and it seems to work. And &quot;distinct&quot; already &lt;a href=&quot;https://github.com/mongodb/mongo/blob/98427b7a2228f6a8d54475adc9df3991c1c60314/src/mongo/db/commands/distinct.cpp#L91-L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;allows snapshot&lt;/a&gt;. So I think we may already have test coverages for this in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47577&quot; title=&quot;readConcernCounters metric in serverStatus&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47577&quot;&gt;&lt;del&gt;SERVER-47577&lt;/del&gt;&lt;/a&gt;. And I am wondering why it works.&lt;/p&gt;</comment>
                            <comment id="3060907" author="jesse" created="Wed, 29 Apr 2020 17:22:20 +0000"  >&lt;p&gt;Ensure readConcern counters in serverStatus are updated to include &quot;distinct&quot; calls, follow up to  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47577&quot; title=&quot;readConcernCounters metric in serverStatus&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47577&quot;&gt;&lt;del&gt;SERVER-47577&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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