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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[COMPASS-6210] Investigate changes in PM-3001: BACKPORT: Add concurrency to the chunk migration code</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6210</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    We are providing a way to add a server parameter (setParameter) to change the destination shard insert concurrency. backporting to 4.4, 5.0 and 6.0. &lt;/p&gt;

&lt;p&gt;syntax changes - &lt;br/&gt;
{setParameter: { migrationConcurrency: N }}&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;h1&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h1&gt;

&lt;p&gt;This project is for backporting changes to parallelize portions of the existing chunk migration algorithm. We propose backporting this through mongoDB 4.4.&lt;/p&gt;
&lt;h1&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h1&gt;

&lt;p&gt;During PM-2740 spike we implemented the following changes to realize up to 5 times higher chunk migration throughput:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Increase the level of concurrency on the destination for the insert portion when moving a chunk.&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;As a result of that spike, we created PM-3014, which implements a new server parameter specifying the level of concurrency for the item above.&lt;/p&gt;
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        <key id="2160553">COMPASS-6210</key>
            <summary>Investigate changes in PM-3001: BACKPORT: Add concurrency to the chunk migration code</summary>
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                        <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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
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                <created>Mon, 17 Oct 2022 15:56:25 +0000</created>
                <updated>Wed, 19 Oct 2022 10:24:07 +0000</updated>
                            <resolved>Wed, 19 Oct 2022 10:23:51 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
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