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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-46432] Enable mapReduce out to collection to run on secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-46432</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Note that mapReduce will not work as written with secondary read preference on a replica set because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/64ec33d37d99a663ef27a0f8c1120785052aebea/src/mongo/client/dbclient_rs.cpp#L232&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;all mapReduce commands will be unconditionally sent to the primary&lt;/a&gt;. Besides test coverage, this ticket will remove this check and also update the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/26e416635c9ec155f293e767650dc3b17a2a6671/jstests/sharding/read_pref_cmd.js#L264&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;following test as well&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1190887">SERVER-46432</key>
            <summary>Enable mapReduce out to collection to run on secondaries</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                            <label>qexec-team</label>
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                <created>Wed, 26 Feb 2020 19:42:14 +0000</created>
                <updated>Tue, 6 Dec 2022 02:34:45 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3033455" author="david.storch" created="Thu, 9 Apr 2020 15:26:55 +0000"  >&lt;p&gt;I&apos;m removing this ticket from the &quot;$out/$merge on secondaries&quot; epic, since mapReduce improvements were not initially in scope. We should still consider backporting this to 4.4 once it lands, though.&lt;/p&gt;</comment>
                            <comment id="2987875" author="david.storch" created="Thu, 19 Mar 2020 17:38:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=arun.banala&quot; class=&quot;user-hover&quot; rel=&quot;arun.banala&quot;&gt;arun.banala&lt;/a&gt;, as we discussed over our call today, we would like to achieve this test coverage by ensuring that in our various secondary reads passthroughs for jscore, the shell targets all mapReduce commands to the secondaries. We suspect that there is currently an issue around causal consistency working with secondary reads for mapReduce, so you may be blocked until &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mihai.andrei&quot; class=&quot;user-hover&quot; rel=&quot;mihai.andrei&quot;&gt;mihai.andrei&lt;/a&gt; merges his fix for this.&lt;/p&gt;</comment>
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