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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4015] Chunk migration should be instantaneous when there&apos;s no data in the chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-4015</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you pre-split a brand new collection into a large number of chunks, it will take a long time for the balancer to balance out those new chunks, because only one chunk is moved every few seconds.  If there&apos;s no actual data to move, chunk migration is really just a metadata update to the config database, and should be able to be done instantaneously.&lt;/p&gt;</description>
                <environment></environment>
        <key id="23213">SERVER-4015</key>
            <summary>Chunk migration should be instantaneous when there&apos;s no data in the chunks</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>migration</label>
                            <label>sharding</label>
                    </labels>
                <created>Tue, 4 Oct 2011 16:30:04 +0000</created>
                <updated>Mon, 19 Nov 2012 20:50:21 +0000</updated>
                            <resolved>Mon, 19 Nov 2012 20:50:21 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="194103" author="eliot" created="Mon, 19 Nov 2012 20:50:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3602&quot; title=&quot;Add fast-path for migrating empty chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3602&quot;&gt;&lt;del&gt;SERVER-3602&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="91485" author="greg_10gen" created="Thu, 23 Feb 2012 19:00:42 +0000"  >&lt;p&gt;Don&apos;t think we can do this instantaneously, at least in the non-initial split case.  The key part of migration is to redirect any writes that could be going on as we perform the move - if we solely update the metadata without doing the locking on shards, new writes to the empty chunk could be misdirected.&lt;/p&gt;

&lt;p&gt;Initial split actually has similar issues too - if we initially create chunks in different shards of the cluster, any writes coming in simultaneously for the unsharded collection won&apos;t correctly be redirected.  &lt;/p&gt;</comment>
                            <comment id="64017" author="spencer" created="Tue, 1 Nov 2011 18:17:19 +0000"  >&lt;p&gt;Can just split the initial chunk into as many chunks as there are shards, assign one large chunk to each shard, then split those chunks up further as desired.  This avoids needing to migrate a ton of empty chunks after doing a bunch of splits on a new collection.&lt;/p&gt;</comment>
                            <comment id="58379" author="spencer" created="Tue, 4 Oct 2011 16:31:27 +0000"  >&lt;p&gt;This would make pre-splitting before a large bulk import much simpler and faster to do.&lt;/p&gt;</comment>
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