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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-25596] Rename SplittableDocumentSource to NeedsMergerDocumentSource</title>
                <link>https://jira.mongodb.org/browse/SERVER-25596</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When planning how to execute an aggregation command on a sharded cluster, the agg system must &quot;split&quot; the pipeline into two pieces:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The part that can be executed in parallel on each targeted shard.&lt;/li&gt;
	&lt;li&gt;The part that must be executed on the merging node. This includes stages like &lt;tt&gt;$group&lt;/tt&gt;, which must aggregate the data from all targeted shards.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;A stage marks itself as requiring execution on the merging shard by inheriting from SplittableDocumentSource. The name reflects the fact that many of the stages which require the merging shard can also be split into two steps: &lt;tt&gt;$group&lt;/tt&gt;, for example, can be executed by grouping on each of the shards and then merging the groups together on the merging shard. In this sense, the &lt;tt&gt;$group&lt;/tt&gt; has been split across the shards part and the merger part of the pipeline.&lt;/p&gt;

&lt;p&gt;In order to better reflect the fact that we use SplittableDocumentSource to mark stages which must happen on the merging shard, even if the stage cannot be split (e.g. &lt;tt&gt;$facet&lt;/tt&gt;), I propose renaming this class to NeedsMergerDocumentSource.&lt;/p&gt;

&lt;p&gt;As part of this change, we may also want to update the code/comments to reflect that the return value of NeedsMergerDocumentSource::getMergeSource() should never be null.&lt;/p&gt;</description>
                <environment></environment>
        <key id="308700">SERVER-25596</key>
            <summary>Rename SplittableDocumentSource to NeedsMergerDocumentSource</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 12 Aug 2016 20:53:03 +0000</created>
                <updated>Fri, 18 May 2018 20:51:21 +0000</updated>
                            <resolved>Fri, 11 May 2018 22:30:22 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1889692" author="xgen-internal-githook" created="Fri, 11 May 2018 22:25:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;KevinCybura&apos;, &apos;email&apos;: &apos;KevinCybura@gmail.com&apos;, &apos;username&apos;: &apos;KevinCybura&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25596&quot; title=&quot;Rename SplittableDocumentSource to NeedsMergerDocumentSource&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25596&quot;&gt;&lt;del&gt;SERVER-25596&lt;/del&gt;&lt;/a&gt; Rename SplittableDocumentSource to NeedsMergerDocumentSource&lt;/p&gt;

&lt;p&gt;Closes #1237&lt;/p&gt;

&lt;p&gt;Signed-off-by: Charlie Swanson &amp;lt;charlie.swanson@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e885cbbc9458eb0de8882ba4fe0b5591498efaf1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e885cbbc9458eb0de8882ba4fe0b5591498efaf1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1875668" author="charlie.swanson" created="Thu, 26 Apr 2018 22:17:11 +0000"  >&lt;p&gt;One of the CUNY students I&apos;m working with is working on a pull request, assigning to myself.&lt;/p&gt;</comment>
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