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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35034] Shard balancing failed </title>
                <link>https://jira.mongodb.org/browse/SERVER-35034</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Data balancing fails on MOngo cluster with 1 mongos and 3 mongods.. All the data for the collection fs.chunks stays in the same shard with the following error.&lt;/p&gt;

&lt;p&gt;Env: Ubuntu- AWS m3.large, &lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;error from sh.status()&lt;/p&gt;

&lt;p&gt;6 : Failed with error &apos;could not acquire collection lock for test.fs.chunks to migrate chunk [{ : MinKey },{ : MaxKey }) :: caused by :: Lock for migrating chunk [{ : MinKey }, { : MaxKey }) in test.fs.chunks is taken.&apos;, from shard0001 to shard0000&lt;br/&gt;
 3826 : Failed with error &apos;moveChunk failed to engage TO-shard in the data transfer: can&apos;t accept new chunks because there are still 7 deletes from previous migration&apos;, from shard0000 to shard0001&lt;br/&gt;
 7655 : Failed with error &apos;moveChunk failed to engage TO-shard in the data transfer: can&apos;t accept new chunks because there are still 4 deletes from previous migration&apos;, from shard0001 to shard0000&lt;/p&gt;</description>
                <environment>PROD</environment>
        <key id="545164">SERVER-35034</key>
            <summary>Shard balancing failed </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="abhisam">Abhi</reporter>
                        <labels>
                            <label>Bug</label>
                    </labels>
                <created>Wed, 16 May 2018 23:10:35 +0000</created>
                <updated>Fri, 8 Jun 2018 03:39:11 +0000</updated>
                            <resolved>Thu, 17 May 2018 21:21:29 +0000</resolved>
                                                                    <component>GridFS</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1894677" author="thomas.schubert" created="Thu, 17 May 2018 21:21:29 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=abhisam&quot; class=&quot;user-hover&quot; rel=&quot;abhisam&quot;&gt;abhisam&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue. This error message indicates that the balancer is waiting for documents on the receiving shard to be deleted (likely because some documents were previously migrated off of this shard) before starting a new migration to that shad. &lt;/p&gt;

&lt;p&gt;From the information provided, I do not see anything to indicate a bug in 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;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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