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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-12261] Map Reduce with sharded output collection creates orphan documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-12261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the post-processing phase of a map reduce run, when a shard pulls the documents for the chunks (of the output collection) that it owns from other shard(s), those documents are not deleted from the source shard(s).  This may result in a large number of orphan documents which greatly increases the storage size of the output collection.&lt;/p&gt;

&lt;p&gt;When documents are migrated across shards during post-processing, they should be removed from the source shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="104813">SERVER-12261</key>
            <summary>Map Reduce with sharded output collection creates orphan documents</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="jon.rangel@mongodb.com">Jon Rangel</reporter>
                        <labels>
                            <label>gm-ack</label>
                    </labels>
                <created>Mon, 6 Jan 2014 17:57:46 +0000</created>
                <updated>Mon, 28 Jan 2019 19:29:47 +0000</updated>
                            <resolved>Mon, 28 Jan 2019 19:29:47 +0000</resolved>
                                                                    <component>MapReduce</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2129696" author="renctan" created="Mon, 28 Jan 2019 19:29:26 +0000"  >&lt;p&gt;My finding years ago was actually wrong. This is not an issue because the collection created on the first phase of map reduce is a temporary collection. Mongos also does a best-effort cleanup after the command is finished (regardless of whether it succeeded or errored out).&lt;/p&gt;</comment>
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