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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-38311] Investigate changing host type requirement for $out</title>
                <link>https://jira.mongodb.org/browse/SERVER-38311</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the design we agreed to the following change in merging policy:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;We will change the pipeline splitting logic such that $out is not forced to execute in the merger part of the pipeline, and does not cause the pipeline to split. If $out is preceded by stages that can all execute in the shards part, then each shard will be responsible for dispatching writes to the correct shard.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="640325">SERVER-38311</key>
            <summary>Investigate changing host type requirement for $out</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Nov 2018 15:02:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:16 +0000</updated>
                            <resolved>Wed, 13 Feb 2019 12:48:54 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2147071" author="xgen-internal-githook" created="Wed, 13 Feb 2019 12:48:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Change out merging strategy&lt;/p&gt;

&lt;p&gt;Allows an $out stage to run in parallel on all shards if the target&lt;br/&gt;
collection is sharded and so is the input collection to the aggregate.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/87194fbe0c24525bc1f2d674012fe6978eca77d2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/87194fbe0c24525bc1f2d674012fe6978eca77d2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2147070" author="xgen-internal-githook" created="Wed, 13 Feb 2019 12:47:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Conform backup cursor stages to new mergingLogic interface&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/c6497d94d328ee39788a85b882323ebe92a57918&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/c6497d94d328ee39788a85b882323ebe92a57918&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2117821" author="charlie.swanson" created="Thu, 17 Jan 2019 01:17:32 +0000"  >&lt;p&gt;Re-opening due to failures in the sharding_csrs_continuous_config_stepdown: &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_display_sharding_csrs_continuous_config_stepdown_fe187bdf22a6c67d5ff6f035d51a308870255e10_19_01_16_20_33_09&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_display_sharding_csrs_continuous_config_stepdown_fe187bdf22a6c67d5ff6f035d51a308870255e10_19_01_16_20_33_09&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2117820" author="xgen-internal-githook" created="Thu, 17 Jan 2019 01:16:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cswanson310&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;}
&lt;p&gt;Message: Revert &quot; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Adjust $out merging strategy&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 0cb2195939494660334db8e9d0a52509caeb621c.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97821dfa13cccb5acad6faef0f536e3d5d77d678&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97821dfa13cccb5acad6faef0f536e3d5d77d678&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2117819" author="xgen-internal-githook" created="Thu, 17 Jan 2019 01:16:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cswanson310&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Conform to new DocumentSource interface&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 02d19b792c3a48a45b4a2b1ce29998c6a6b04f9e.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/991976694c0ce0fc4bc511a68b812ae7e4e7fd8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/991976694c0ce0fc4bc511a68b812ae7e4e7fd8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2116900" author="xgen-internal-githook" created="Wed, 16 Jan 2019 15:10:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cswanson310&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;}
&lt;p&gt;Message:  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Adjust $out merging strategy&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0cb2195939494660334db8e9d0a52509caeb621c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0cb2195939494660334db8e9d0a52509caeb621c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2116895" author="xgen-internal-githook" created="Wed, 16 Jan 2019 15:09:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cswanson310&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38311&quot; title=&quot;Investigate changing host type requirement for $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38311&quot;&gt;&lt;del&gt;SERVER-38311&lt;/del&gt;&lt;/a&gt; Conform to new DocumentSource interface&lt;/p&gt;

&lt;p&gt;This was shifted around a bit to help change the merging strategy&lt;br/&gt;
required to run $out in a sharded cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/02d19b792c3a48a45b4a2b1ce29998c6a6b04f9e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/02d19b792c3a48a45b4a2b1ce29998c6a6b04f9e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2082835" author="charlie.swanson" created="Thu, 6 Dec 2018 16:48:11 +0000"  >&lt;p&gt;This one got a little hairier than originally anticipated. Temporarily pausing progress on this one to get some of the quicker and higher priority things out of the way first.&lt;/p&gt;</comment>
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