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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-18118] Question for Auto/Manual Migration Performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-18118</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Dear MongoDB Support Team,&lt;/p&gt;

&lt;p&gt;I have a problem that automatic migration process has taken a long time to distribute chunks to new shards. It actually took 35 days in my environment until the number of all chunks became even, with the default chunk size(64M). Please see the details below for what I have done on my sharded cluster.&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;when&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;what&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;11th, March&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Cluster was running with 7 shards, 2186 chunks for each.&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;12th, March&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Added new 3 shards to cluster and auto migration started. 10 shards from then on.&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;18th, April&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Migration has completed. Now, cluster is running with 10 shards, 1828 chunks for each.&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;My question is: would it be faster to process chunk migration if manually operated? If the manual migration will improve the speed of the entire migration process, I would opt for it when adding new shards next time.&lt;/p&gt;

&lt;p&gt;I have had some tries at seeing how moveChunk() works with a couple of options such as `_secondaryThrottle` or `_waitForDelete` experimentally with the balancer temporarily off, however, I am not sure how it affects the whole performance.&lt;/p&gt;

&lt;p&gt;It would be really appreciated if I could gain some of your insights about this.&lt;/p&gt;

&lt;p&gt;Best Regards,&lt;br/&gt;
Kazuo Yagi&lt;/p&gt;</description>
                <environment></environment>
        <key id="198862">SERVER-18118</key>
            <summary>Question for Auto/Manual Migration Performance</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="ka_yagi@fancs.com">Kazuo Yagi</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Apr 2015 05:42:49 +0000</created>
                <updated>Tue, 21 Apr 2015 01:55:46 +0000</updated>
                            <resolved>Mon, 20 Apr 2015 13:37:18 +0000</resolved>
                                    <version>2.6.6</version>
                                                    <component>Admin</component>
                    <component>Performance</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="893526" author="ramon.fernandez" created="Tue, 21 Apr 2015 01:55:46 +0000"  >&lt;p&gt;No bother at all, I reckon some times is not easy to find the right forum for each question. You may also want to take a look at &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.org/about/support/&lt;/a&gt; for more details, and if you find a bug or have an improvement suggestion the SERVER project is definitely the right place for it.&lt;/p&gt;

&lt;p&gt;Cheers,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="893505" author="ka_yagi@fancs.com" created="Tue, 21 Apr 2015 00:56:44 +0000"  >&lt;p&gt;Dear Ramon,&lt;/p&gt;

&lt;p&gt;Thank you for pointing it out. I will post this those recommended places.&lt;br/&gt;
I&apos;m sorry to bother you about this.&lt;/p&gt;

&lt;p&gt;Best Regards,&lt;br/&gt;
Kazuo Yagi&lt;/p&gt;</comment>
                            <comment id="892671" author="ramon.fernandez" created="Mon, 20 Apr 2015 13:37:09 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ka_yagi%40fancs.com&quot; class=&quot;user-hover&quot; rel=&quot;ka_yagi@fancs.com&quot;&gt;ka_yagi@fancs.com&lt;/a&gt;. Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;.&lt;/p&gt;

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