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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-22656] Componentize Migration{Source,Dest}Manager</title>
                <link>https://jira.mongodb.org/browse/SERVER-22656</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Make the migration logic be entirely owned by the the migration source and destination managers and add abstractions so they can be unit-tested.&lt;/p&gt;</description>
                <environment></environment>
        <key id="265890">SERVER-22656</key>
            <summary>Componentize Migration{Source,Dest}Manager</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>Tue, 16 Feb 2016 22:28:16 +0000</created>
                <updated>Mon, 9 Dec 2019 16:05:55 +0000</updated>
                            <resolved>Wed, 23 Mar 2016 16:27:09 +0000</resolved>
                                                    <fixVersion>3.3.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1212614" author="xgen-internal-githook" created="Wed, 23 Mar 2016 16:26:01 +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-22656&quot; title=&quot;Componentize Migration{Source,Dest}Manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22656&quot;&gt;&lt;del&gt;SERVER-22656&lt;/del&gt;&lt;/a&gt; Componentize MigrationSourceManager&lt;/p&gt;

&lt;p&gt;This change moves the entire chunk migration state machine to be driven by&lt;br/&gt;
the MigrationSourceManager and abstracts the cloning logic behind an interface&lt;br/&gt;
called MigrationChunkClonerSource with a default legacy implementation, which&lt;br/&gt;
uses the existing _migrateClone/_transferMods commands.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84223317a67211cf19d9ef1e944ef3fe12a819ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84223317a67211cf19d9ef1e944ef3fe12a819ac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1211254" author="xgen-internal-githook" created="Tue, 22 Mar 2016 15:22:47 +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-22656&quot; title=&quot;Componentize Migration{Source,Dest}Manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22656&quot;&gt;&lt;del&gt;SERVER-22656&lt;/del&gt;&lt;/a&gt; Tighten assertions for move chunk donate&lt;/p&gt;

&lt;p&gt;Moves the shard version checking during move chunk to happen at the time&lt;br/&gt;
of metadata clone instead of being decided in advance and tightens the&lt;br/&gt;
associated assertions.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/622707b5ce4bde79cbf6df07bafc98038d5c7e8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/622707b5ce4bde79cbf6df07bafc98038d5c7e8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1208422" author="xgen-internal-githook" created="Fri, 18 Mar 2016 20:37:18 +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-22656&quot; title=&quot;Componentize Migration{Source,Dest}Manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22656&quot;&gt;&lt;del&gt;SERVER-22656&lt;/del&gt;&lt;/a&gt; Use RAII classes to enter migration&lt;/p&gt;

&lt;p&gt;Adds a RAII-style classes to put a shard into migration mode and acquire&lt;br/&gt;
distributed lock and adds means to register the migration on the global&lt;br/&gt;
sharding state.&lt;/p&gt;

&lt;p&gt;Removes references to the global migration source manager from everywhere&lt;br/&gt;
but the migration code itself. All others will be referencing it from the&lt;br/&gt;
collection.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5080cbfac539b5184d96e97b58c00fbfba7ab90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5080cbfac539b5184d96e97b58c00fbfba7ab90&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1190334" author="xgen-internal-githook" created="Wed, 2 Mar 2016 14:45:25 +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-22656&quot; title=&quot;Componentize Migration{Source,Dest}Manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22656&quot;&gt;&lt;del&gt;SERVER-22656&lt;/del&gt;&lt;/a&gt; Move _recvChunkStart command parsing to separate class&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/52ccff6c2112f45fcf6869484e663371bcfc8cf8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/52ccff6c2112f45fcf6869484e663371bcfc8cf8&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="265892">SERVER-22657</issuekey>
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            <issuelink>
            <issuekey id="265893">SERVER-22658</issuekey>
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            <issuekey id="246482">SERVER-22116</issuekey>
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