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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-25384] Create a config.migrations collection and a Scoped RAII object class to write to it for migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-25384</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The balancer is going to write every active migrations to the config.migrations collection so that this collection can be used for migration recovery on balancer startup after a stepdown/crash.&lt;/p&gt;

&lt;p&gt;config.migrations should have fields to identify the specific chunk as well as a version and toShard field&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This collection should have an index on (ns, min, max) so that duplicate migrations cannot be scheduled &amp;#8211; this would fail anyway.&lt;/p&gt;

&lt;p&gt;The version field is necessary so that on recovery that balancer will not try to schedule a migration that managed to both succeed and be moved back to the original source shard. This can only happen if a v3.2 mongos is running and scheduling moveChunk commands directly to the shards rather than through the balancer &amp;#8211; in v3.4, all moveChunks go through the balancer, i.e. a v3.4 mongos routes moveChunk commands to the balancer.&lt;/p&gt;

&lt;p&gt;------------------------------------------------&lt;/p&gt;

&lt;p&gt;Create a ScopedMigrationRequest RAII object class that will write to config.migrations on creation and destruction, to add and remove an entry, respectively.&lt;/p&gt;

&lt;p&gt;Create a static method that:&lt;br/&gt;
    instantiates the scoped object after a local insert is successful. &lt;br/&gt;
    waits for majority write concern, and returns an error on failure&lt;/p&gt;

&lt;p&gt;The destructor does a local delete &amp;#8211; don&apos;t need to worry about majority because if majority fails and we stepdown/crash, recovery will just safely check the migration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="305655">SERVER-25384</key>
            <summary>Create a config.migrations collection and a Scoped RAII object class to write to it for migrations</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, 1 Aug 2016 19:56:31 +0000</created>
                <updated>Fri, 2 Sep 2016 00:29:28 +0000</updated>
                            <resolved>Sat, 20 Aug 2016 19:54:38 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1361207" author="xgen-internal-githook" created="Thu, 18 Aug 2016 18:09:02 +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-25384&quot; title=&quot;Create a config.migrations collection and a Scoped RAII object class to write to it for migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25384&quot;&gt;&lt;del&gt;SERVER-25384&lt;/del&gt;&lt;/a&gt; fixing asan build error for copy elision in scoped_migration_request_test.cpp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ceeb17e4265c4c48765acbf9ad6a60b5f1889332&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ceeb17e4265c4c48765acbf9ad6a60b5f1889332&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1361036" author="xgen-internal-githook" created="Thu, 18 Aug 2016 15:57:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25384&quot; title=&quot;Create a config.migrations collection and a Scoped RAII object class to write to it for migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25384&quot;&gt;&lt;del&gt;SERVER-25384&lt;/del&gt;&lt;/a&gt; fixing asan build error for copy elision in scoped_migration_request_test.cpp&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit bb63fec164121c14f80a09ae80880c6629edac35.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb182510659174ca4b6ea355414671abf3eb9533&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb182510659174ca4b6ea355414671abf3eb9533&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1360934" author="xgen-internal-githook" created="Thu, 18 Aug 2016 14:59:44 +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-25384&quot; title=&quot;Create a config.migrations collection and a Scoped RAII object class to write to it for migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25384&quot;&gt;&lt;del&gt;SERVER-25384&lt;/del&gt;&lt;/a&gt; fixing asan build error for copy elision in scoped_migration_request_test.cpp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bb63fec164121c14f80a09ae80880c6629edac35&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bb63fec164121c14f80a09ae80880c6629edac35&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1359778" author="xgen-internal-githook" created="Wed, 17 Aug 2016 17:08:13 +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-25384&quot; title=&quot;Create a config.migrations collection and a Scoped RAII object class to write to it for migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25384&quot;&gt;&lt;del&gt;SERVER-25384&lt;/del&gt;&lt;/a&gt; Create a config.migrations collection and a Scoped RAII object class to write to it for migrations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8e19a43ce5401c6333efc7c7dee291778bcec94a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8e19a43ce5401c6333efc7c7dee291778bcec94a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1344807" author="dianna.hohensee" created="Tue, 2 Aug 2016 16:25:27 +0000"  >&lt;p&gt;True. Thanks!&lt;/p&gt;</comment>
                            <comment id="1344722" author="spencer" created="Tue, 2 Aug 2016 15:40:19 +0000"  >&lt;p&gt;Probably also need to include the collection epoch, in case the collection was dropped and re-created.&lt;/p&gt;</comment>
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