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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-66480] Create a new command to join a generic chunk migration on a donor/recipient shard.</title>
                <link>https://jira.mongodb.org/browse/SERVER-66480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On startup time, the Balancer needs to wait for the completion of all the outstanding chunk migrations executed across the cluster before generating new requests.&lt;/p&gt;

&lt;p&gt;In the past this was achieved by persisting in &lt;tt&gt;config.migrations&lt;/tt&gt; a recovery doc for every &lt;tt&gt;moveChunk&lt;/tt&gt; requested and repeating the command for every unanswered one upon a config server step down/crash.&lt;/p&gt;

&lt;p&gt;The same approach cannot be adopted to recover &lt;tt&gt;moveRange&lt;/tt&gt; commands (which semantics are slightly different) without causing undesired side effects when the cluster gets downgraded.&lt;/p&gt;

&lt;p&gt;A more generic alternative could be built upon a new command that allows a client to wait until the contacted shard is no longer involved in any migration activity.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2047216">SERVER-66480</key>
            <summary>Create a new command to join a generic chunk migration on a donor/recipient shard.</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="13201">Fixed</resolution>
                                        <assignee username="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 May 2022 14:00:28 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:14 +0000</updated>
                            <resolved>Tue, 24 May 2022 07:09:32 +0000</resolved>
                                                    <fixVersion>6.0.0-rc8</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4580279" author="xgen-internal-githook" created="Sun, 29 May 2022 20:43:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66480&quot; title=&quot;Create a new command to join a generic chunk migration on a donor/recipient shard.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66480&quot;&gt;&lt;del&gt;SERVER-66480&lt;/del&gt;&lt;/a&gt; introduce joinMigration shard cmd to set a barrier on the Balancer initialisation&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 531dfe764bc0645f5e676feaf5687100c0a5e612)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ae0a24f4d2323424784a941c783c7cf39c3ec20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ae0a24f4d2323424784a941c783c7cf39c3ec20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4568383" author="JIRAUSER1259531" created="Tue, 24 May 2022 07:08:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;

{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66480&quot; title=&quot;Create a new command to join a generic chunk migration on a donor/recipient shard.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66480&quot;&gt;&lt;del&gt;SERVER-66480&lt;/del&gt;&lt;/a&gt; introduce joinMigration shard cmd to set a barrier on the Balancer initialisation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/531dfe764bc0645f5e676feaf5687100c0a5e612&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/531dfe764bc0645f5e676feaf5687100c0a5e612&lt;/a&gt;&lt;/p&gt;
</comment>
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