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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-25202] Make MigrationManager able to schedule new migrations while there are migrations outstanding</title>
                <link>https://jira.mongodb.org/browse/SERVER-25202</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to be able to support multiple manual &lt;tt&gt;moveChunk&lt;/tt&gt; requests for the same collection (but different shards) we need to change the API of the MigrationManager so new migrations can be scheduled on it, while there are migrations outstanding.&lt;/p&gt;

&lt;p&gt;In order to do this, we will introduce a &lt;tt&gt;scheduleMigration(MigrationRequest)&lt;/tt&gt; method, which will return a &lt;tt&gt;Notification&lt;/tt&gt; object, which can be waited on for the purposes of obtaining the results of that migration request.&lt;/p&gt;</description>
                <environment></environment>
        <key id="303096">SERVER-25202</key>
            <summary>Make MigrationManager able to schedule new migrations while there are migrations outstanding</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Jul 2016 20:46:56 +0000</created>
                <updated>Fri, 2 Sep 2016 00:28:59 +0000</updated>
                            <resolved>Fri, 12 Aug 2016 19:14:08 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1355756" author="xgen-internal-githook" created="Fri, 12 Aug 2016 19:12:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25202&quot; title=&quot;Make MigrationManager able to schedule new migrations while there are migrations outstanding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25202&quot;&gt;&lt;del&gt;SERVER-25202&lt;/del&gt;&lt;/a&gt; Support parallel manual chunk migrations&lt;/p&gt;

&lt;p&gt;This change switches the MigrationManager to use the UsedResourcesMap&lt;br/&gt;
class for acquiring the collection distributed lock on first migration&lt;br/&gt;
attempt and dropping it on the last.&lt;/p&gt;

&lt;p&gt;This allows it to support parallel manual migrations.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0c6bbea55ee45db0813043b470246fc62501a38c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0c6bbea55ee45db0813043b470246fc62501a38c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1346481" author="xgen-internal-githook" created="Wed, 3 Aug 2016 23:30:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25202&quot; title=&quot;Make MigrationManager able to schedule new migrations while there are migrations outstanding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25202&quot;&gt;&lt;del&gt;SERVER-25202&lt;/del&gt;&lt;/a&gt; Expose lock/unlock control on DistLockManager&lt;/p&gt;

&lt;p&gt;This change exposes the lock/unlock methods as public on the&lt;br/&gt;
DistLockManager. This enables the scenario of being able to pass locks&lt;br/&gt;
between threads, which is necessary for the parallel balancer.&lt;/p&gt;

&lt;p&gt;Also makes the sharding balancer acquire the balancer distributed lock&lt;br/&gt;
permanently.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/604b2e18bd8b7c0affb601f53ed4b57d18d72947&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/604b2e18bd8b7c0affb601f53ed4b57d18d72947&lt;/a&gt;&lt;/p&gt;</comment>
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