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    <title>MongoDB Jira</title>
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    <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-62008] Support majority read for $indexStats</title>
                <link>https://jira.mongodb.org/browse/SERVER-62008</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In C2C replication, we would like to only replicate majority committed data so that we can avoid handling rollbacks of the source cluster. This is now done by using majority readConcern in collection scans in the cloning phase. However, listDatabases/listCollections/listIndexes don&apos;t support reading majority committed catalog as the catalog is not versioned. This makes it very hard for an external process to detect when the result returned by these list commands rolls back. For mongosync, we are planning to use $indexStats instead of listIndexes to get the index info.&lt;/p&gt;

&lt;p&gt;This work is to support read concern level &#8220;majority&#8221; for $indexStats (or support it for some new $listIndexes aggregation stage which targets all shards owning chunks) by reading from a majority committed snapshot of the _mdb_catalog without actually introducing versioned catalog.&lt;/p&gt;

&lt;p&gt;And it should work for both replica sets and sharded clusters.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1947757">SERVER-62008</key>
            <summary>Support majority read for $indexStats</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Dec 2021 15:36:37 +0000</created>
                <updated>Sun, 21 May 2023 23:43:11 +0000</updated>
                            <resolved>Wed, 2 Mar 2022 21:29:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4387820" author="benety.goh" created="Wed, 2 Mar 2022 21:29:06 +0000"  >&lt;p&gt;The indexStats aggregation stage reads the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d883e3e0c216f10f7a1368bdd9d59316c32d2cd6/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L223&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unversioned index usage tracker&lt;/a&gt;. The aggregation stage added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62006&quot; title=&quot;Support majority read for _mdb_catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62006&quot;&gt;&lt;del&gt;SERVER-62006&lt;/del&gt;&lt;/a&gt; provides index specs from a snapshot of the &lt;tt&gt;_mdb_catalog&lt;/tt&gt; that is consistent with the requested read concern.&lt;/p&gt;</comment>
                            <comment id="4248025" author="connie.chen" created="Tue, 14 Dec 2021 21:39:30 +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;&#160;could you provide more context on the motivation for this?&#160;&lt;/p&gt;</comment>
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