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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-22616] Make balancer architecture more scalable by allowing parallel chunk migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-22616</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. Moving one chunk at a time is not a feature of an allegedly &quot;linear scalable&quot; product.&lt;/p&gt;

&lt;p&gt;2. Waiting for chunks to be deleted on a target shard, before moving chunks of a totally different collection, is not a scalable design.&lt;br/&gt;
Note: I&apos;m not referring to the wait which is controllable via waitForDelete, I&apos;m referring to not starting at all - i.e. &quot;can&apos;t accept new chunks because  there are still X deletes from previous migration&quot;&lt;/p&gt;

&lt;p&gt;3. If you detect this behavior, why not move to the next chunk in the meantime? other shards can accept chunks. The current bottleneck for our system at the moment is the range deleter on a single shard. Until it finishes deleting, no balancing occurs in the entire cluster. This is ridicoulus.&lt;/p&gt;</description>
                <environment></environment>
        <key id="265484">SERVER-22616</key>
            <summary>Make balancer architecture more scalable by allowing parallel chunk migrations</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="yonido">Yoni Douek</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Feb 2016 13:41:41 +0000</created>
                <updated>Mon, 15 Feb 2016 13:59:41 +0000</updated>
                            <resolved>Mon, 15 Feb 2016 13:56:23 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1173304" author="yonido" created="Mon, 15 Feb 2016 13:59:41 +0000"  >&lt;p&gt;OK, consider solving 2 and 3 in the meantime. They are unrelated.&lt;/p&gt;</comment>
                            <comment id="1173302" author="ramon.fernandez" created="Mon, 15 Feb 2016 13:56:10 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yonido&quot; class=&quot;user-hover&quot; rel=&quot;yonido&quot;&gt;yonido&lt;/a&gt;, this feature was already requested in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4355&quot; title=&quot;Support multiple parallel chunk migrations for the same collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4355&quot;&gt;&lt;del&gt;SERVER-4355&lt;/del&gt;&lt;/a&gt;, so I&apos;m closing this ticket as a duplicate. Feel free to watch &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4355&quot; title=&quot;Support multiple parallel chunk migrations for the same collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4355&quot;&gt;&lt;del&gt;SERVER-4355&lt;/del&gt;&lt;/a&gt; for updates and vote for it.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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