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    <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-47240] Add the &quot;The live migration protocol&quot; section to the sharding arch guide</title>
                <link>https://jira.mongodb.org/browse/SERVER-47240</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Guidelines:&lt;/p&gt;

&lt;p&gt;Should include&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Why do we only allow a shard to donate/receive one chunk at a time? E.g. to avoid frequent StaleShardVersions&lt;/li&gt;
	&lt;li&gt;What is the serialization mechanism to make a shard only donate/receive one chunk at a time?&lt;/li&gt;
	&lt;li&gt;What are the phases of the live migration (e.g. bulk clone, transfer mods, commit)&lt;/li&gt;
	&lt;li&gt;Why do we update the ShardingStateRecovery document during migration and what is it used for?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Code references&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;ActiveMigrationsRegistry class&lt;/li&gt;
	&lt;li&gt;MigrationSourceManager class&lt;/li&gt;
	&lt;li&gt;MigrationDestinationManager class&lt;/li&gt;
	&lt;li&gt;ShardingStateRecovery class&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1300590">SERVER-47240</key>
            <summary>Add the &quot;The live migration protocol&quot; section to the sharding arch guide</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="alex.taskov@mongodb.com">Alexander Taskov</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Apr 2020 19:01:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:06 +0000</updated>
                            <resolved>Fri, 17 Apr 2020 17:30:22 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3045033" author="xgen-internal-githook" created="Fri, 17 Apr 2020 16:59:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alex Taskov&apos;, &apos;email&apos;: &apos;alex.taskov@mongodb.com&apos;, &apos;username&apos;: &apos;alextaskov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47240&quot; title=&quot;Add the &amp;quot;The live migration protocol&amp;quot; section to the sharding arch guide&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47240&quot;&gt;&lt;del&gt;SERVER-47240&lt;/del&gt;&lt;/a&gt; Add the &quot;The live migration protocol&quot; section to the sharding arch guide&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8fa3fd63e5338dc7a0e1c156e74441e1c481fe10&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8fa3fd63e5338dc7a0e1c156e74441e1c481fe10&lt;/a&gt;&lt;/p&gt;</comment>
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