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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>
    </build-info>


<item>
            <title>[SERVER-73633] Refactor the transaction supporting ShardingCatalogManager::commitChunkMigration()</title>
                <link>https://jira.mongodb.org/browse/SERVER-73633</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The commit of a chunk migration triggers the execution of a &lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2221-L2432&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transaction&lt;/a&gt; with multiple conditional steps, which can summarised as:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2301-L2311&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;persist updated data&lt;/a&gt; in &lt;tt&gt;config.chunks&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;If the &lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2313-L2316&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;placement of the parent collection is impacted&lt;/a&gt; by the migrated chunk(s), also persist updated data into &lt;tt&gt;config.placementHistory&lt;/tt&gt;:
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;if prior information of the parent collection &lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2367-L2377&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is available&lt;/a&gt; in &lt;tt&gt;config.placementHistory&lt;/tt&gt;, fetch it, &lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2396-L2423&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;adapt it and re-insert it&lt;/a&gt;&lt;/li&gt;
		&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/d8a92273a4a51dd88588b5a122a4ba471e36b9ae/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2390&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;otherwise&lt;/a&gt;, extract up-to-date placement data from &lt;tt&gt;config.chunks&lt;/tt&gt; and persist it into &lt;tt&gt;config.placementHistory.&lt;/tt&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Such logic is currently distributed through several future sub-chains, which complicates the understanding of the whole process.&lt;/p&gt;

&lt;p&gt;The objective of this ticket is to provide a more explicit alternative.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2253530">SERVER-73633</key>
            <summary>Refactor the transaction supporting ShardingCatalogManager::commitChunkMigration()</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                            <label>car-qw</label>
                            <label>oldshardingemea</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 6 Feb 2023 11:35:04 +0000</created>
                <updated>Thu, 23 Nov 2023 08:33:46 +0000</updated>
                            <resolved>Thu, 23 Nov 2023 08:33:46 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5899300" author="xgen-internal-githook" created="Wed, 22 Nov 2023 17:26:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pol Pinol Castuera&apos;, &apos;email&apos;: &apos;pol.pinol@mongodb.com&apos;, &apos;username&apos;: &apos;PolPinol&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73633&quot; title=&quot;Refactor the transaction supporting ShardingCatalogManager::commitChunkMigration()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73633&quot;&gt;&lt;del&gt;SERVER-73633&lt;/del&gt;&lt;/a&gt; Refactor commit chunk migration transaction chain&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/464ce20d75bb0b689d6325efad1125287d02ff55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/464ce20d75bb0b689d6325efad1125287d02ff55&lt;/a&gt;&lt;/p&gt;</comment>
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