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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-26213] Remove MigrationManager::CollectionMigrationsState::distLockHandle variable or remove MigrationManager&apos;s constant value distlock lockSessionID</title>
                <link>https://jira.mongodb.org/browse/SERVER-26213</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since the MigrationManager is using a constant value as a lock session id, which is what DistLockHandle is, there is no longer a need for MigrationManager::CollectionMigrationsState to store this value. DistLockHandle will always be equal to MigrationManager::_lockSessionID for every balancer instance.&lt;/p&gt;

&lt;p&gt;Remove the MigrationManager::CollectionMigrationsState struct&apos;s distLockHandle variable, and clean up the MigrationManager code a bit because it no longer needs to handle it.&lt;/p&gt;

&lt;p&gt;OR:           ------------&lt;/p&gt;

&lt;p&gt;Get rid of the constant lockSessionID value per balancer instance. This &lt;a href=&quot;https://github.com/mongodb/mongo/commit/6b5fd115d38582d8b349a5aad2c29867e69dc758#diff-5b3bc744a1b56a2b2b44d69177922ef8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commit&lt;/a&gt; is then revertible. This would probably involve creating the MigrationManager::CollectionMigrationState objects in MigrationManager::startRecoveryAndAcquireDistLocks&lt;/p&gt;</description>
                <environment></environment>
        <key id="317802">SERVER-26213</key>
            <summary>Remove MigrationManager::CollectionMigrationsState::distLockHandle variable or remove MigrationManager&apos;s constant value distlock lockSessionID</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>Wed, 21 Sep 2016 14:07:12 +0000</created>
                <updated>Wed, 5 Apr 2017 11:41:37 +0000</updated>
                            <resolved>Fri, 27 Jan 2017 15:22:36 +0000</resolved>
                                                    <fixVersion>3.5.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1486796" author="xgen-internal-githook" created="Fri, 27 Jan 2017 15:22:19 +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-26213&quot; title=&quot;Remove MigrationManager::CollectionMigrationsState::distLockHandle variable or remove MigrationManager&amp;#39;s constant value distlock lockSessionID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26213&quot;&gt;&lt;del&gt;SERVER-26213&lt;/del&gt;&lt;/a&gt; Remove MigrationManager::CollectionMigrationsState::distLockHandle variable&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/310ce16e32d0f2c110a0f8e2b11e0e0cbc1617ad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/310ce16e32d0f2c110a0f8e2b11e0e0cbc1617ad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1474746" author="dianna.hohensee" created="Wed, 11 Jan 2017 17:20:53 +0000"  >&lt;p&gt;Going forward with removing MigrationManager::CollectionMigrationsState::distLockHandle, rather than more extensive MigrationManager refactoring and cleaning up the DistLockManager. The work has already been put in to change the DistLockManager for the use cases of MigrationManager, and we don&apos;t want to spend more time making DistLockManager nicer when we&apos;re angling to remove it entirely.&lt;/p&gt;</comment>
                            <comment id="1474530" author="dianna.hohensee" created="Wed, 11 Jan 2017 15:30:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, this is still applicable and should be done. &lt;/p&gt;

&lt;p&gt;The MigrationManager is using MigrationManager::_lockSessionID to lock distlocks, then _lockSessionID&apos;s value is returned by the lock function and stored in MigrationManager::CollectionMigrationsState::distLockHandle. FInally, distLockHandle, which is the same as _lockSessionID, is used to unlock the distlock.&lt;/p&gt;</comment>
                            <comment id="1474052" author="kaloian.manassiev" created="Tue, 10 Jan 2017 22:41:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, can you see whether this is still applicable and necessary?&lt;/p&gt;</comment>
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                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
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