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    <title>MongoDB Jira</title>
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    <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-21626] Balancer should skip namespaces which get dropped while it is running</title>
                <link>https://jira.mongodb.org/browse/SERVER-21626</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the sharding balancer first selects chunks which should be moved around and then passes them to the _moveChunks routine to do the actual move. This routine does not expect any of these chunks&apos; databases to disappear during the round, but there is nothing to prevent this (and there is no need to).&lt;/p&gt;

&lt;p&gt;We should make the balancer _moveChunks routine skip databases and collections, which do not exist and there should be a secondary check, which checks the collection&apos;s epoch to ensure that if a collection is dropped and recreated, we will discard any further moves for that collection from this round.&lt;/p&gt;</description>
                <environment></environment>
        <key id="240675">SERVER-21626</key>
            <summary>Balancer should skip namespaces which get dropped while it is running</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Nov 2015 14:27:41 +0000</created>
                <updated>Wed, 7 Sep 2016 21:46:16 +0000</updated>
                            <resolved>Wed, 7 Sep 2016 21:45:35 +0000</resolved>
                                                    <fixVersion>3.3.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1378972" author="kaloian.manassiev" created="Wed, 7 Sep 2016 21:45:35 +0000"  >&lt;p&gt;Fixed as a result of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24853&quot; title=&quot;Refactor Balancer code to use MigrationManager in order to move chunks in parallel&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24853&quot;&gt;&lt;del&gt;SERVER-24853&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1095907" author="xgen-internal-githook" created="Mon, 23 Nov 2015 16:38:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21626&quot; title=&quot;Balancer should skip namespaces which get dropped while it is running&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21626&quot;&gt;&lt;del&gt;SERVER-21626&lt;/del&gt;&lt;/a&gt; Do not fassert if namespace gets dropped during balancing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5a60bf3705a6f060c15b1d21d5353391523e61d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5a60bf3705a6f060c15b1d21d5353391523e61d&lt;/a&gt;&lt;/p&gt;</comment>
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