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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-56353] Clear leftover incomplete chunk entries on FCV upgrade from 4.4 to 5.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-56353</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sharded DDL running under versions 4.4 and earlier can possibly fail after having written some &lt;tt&gt;config.chunks&lt;/tt&gt; entries, but before it has written the &lt;tt&gt;config.collection&lt;/tt&gt; entry to join them. Such chunks would become unreachable and are effectively garbage.&lt;/p&gt;

&lt;p&gt;Since they are unreachable for the upgrade process as well, it means we cannot assign UUID to them and because of this they would result in a duplicate key error on the &lt;tt&gt;uuid, min&lt;/tt&gt; index. Because of this, they should be deleted after we have patched up all the chunks reachable from &lt;tt&gt;config.collections&lt;/tt&gt; entries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1691609">SERVER-56353</key>
            <summary>Clear leftover incomplete chunk entries on FCV upgrade from 4.4 to 5.0</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0-Metadata-Format</label>
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                <created>Mon, 26 Apr 2021 16:28:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:30 +0000</updated>
                            <resolved>Wed, 28 Apr 2021 07:37:05 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3743011" author="xgen-internal-githook" created="Wed, 28 Apr 2021 07:11:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56353&quot; title=&quot;Clear leftover incomplete chunk entries on FCV upgrade from 4.4 to 5.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56353&quot;&gt;&lt;del&gt;SERVER-56353&lt;/del&gt;&lt;/a&gt; Cleanup incomplete chunks from a failed pre-5.0 shard/dropCollection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc69d699417c64335942cbadcbdd3c2b886debd8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc69d699417c64335942cbadcbdd3c2b886debd8&lt;/a&gt;&lt;/p&gt;</comment>
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