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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-24532] Create a MigrationManager on the balancer</title>
                <link>https://jira.mongodb.org/browse/SERVER-24532</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The balancer will handle starting up, shutting down, periodically checking for balancing work, and finding precise chunks to move around. These chunks will then be handed to the MigrationManager, which will: attempt to schedule the migrations; manage the distlocks; maintain information about the migrations in progress. The MigrationManager will call moveChunks in parallel by using the TaskExecutor to asynchronously schedule them. It will then wait synchronously for the moveChunk commands to return.&lt;/p&gt;

&lt;p&gt;MigrationManager&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;schedule the migrations&lt;/li&gt;
	&lt;li&gt;take the distlocks, store them as shared_ptrs in some Migration object&lt;/li&gt;
	&lt;li&gt;hold a set of Migration objects &amp;#8211; make up an appropriate name &amp;#8211; to maintain information about each active migration.
	&lt;ul&gt;
		&lt;li&gt;collection NamespaceString&lt;/li&gt;
		&lt;li&gt;distlock shared_ptr&lt;/li&gt;
		&lt;li&gt;ChunkRange&lt;/li&gt;
		&lt;li&gt;toShard&lt;/li&gt;
		&lt;li&gt;fromShard&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;TODO in a later ticket: use the information in the Migration objects to determine migration conflicts so that conflicts aren&apos;t just found when the moveChunk command is rejected.&lt;br/&gt;
TODO in a later ticket: find a way to parallelize receiving moveChunk responses, so a slow migration won&apos;t hold up releasing the distlocks of faster migrations that were scheduled later.&lt;/p&gt;</description>
                <environment></environment>
        <key id="293381">SERVER-24532</key>
            <summary>Create a MigrationManager on the balancer</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="9">Done</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Jun 2016 14:11:27 +0000</created>
                <updated>Tue, 19 Jul 2016 17:04:21 +0000</updated>
                            <resolved>Wed, 13 Jul 2016 19:02:27 +0000</resolved>
                                                    <fixVersion>3.3.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1323117" author="xgen-internal-githook" created="Wed, 13 Jul 2016 19:00:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24532&quot; title=&quot;Create a MigrationManager on the balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24532&quot;&gt;&lt;del&gt;SERVER-24532&lt;/del&gt;&lt;/a&gt; adding MigrationManager to manage parallel migrations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08f3a57fbb54e72a03e47047a1e8aea0f708f1c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08f3a57fbb54e72a03e47047a1e8aea0f708f1c7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1321595" author="xgen-internal-githook" created="Tue, 12 Jul 2016 17:10:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24532&quot; title=&quot;Create a MigrationManager on the balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24532&quot;&gt;&lt;del&gt;SERVER-24532&lt;/del&gt;&lt;/a&gt; adding MigrationManager to manage parallel migrations&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 2155b293eaf4264dee1bdf68022b66e636a20a63.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e9da86226846bd5838af7be9aa60188c180e209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e9da86226846bd5838af7be9aa60188c180e209&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1320437" author="xgen-internal-githook" created="Mon, 11 Jul 2016 18:39:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DiannaHohensee&apos;, u&apos;name&apos;: u&apos;Dianna Hohensee&apos;, u&apos;email&apos;: u&apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24532&quot; title=&quot;Create a MigrationManager on the balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24532&quot;&gt;&lt;del&gt;SERVER-24532&lt;/del&gt;&lt;/a&gt; adding MigrationManager to manage parallel migrations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2155b293eaf4264dee1bdf68022b66e636a20a63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2155b293eaf4264dee1bdf68022b66e636a20a63&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="265917">SERVER-22669</issuekey>
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