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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-13531] Collection drop doesn&apos;t clean the shard version on empty shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-13531</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a sharded collection, if all chunks on the primary shard has been migrated to non-primary shards, collection drop command on mongos will not send &quot;drop&quot; command to the empty primary shard, but set its shard version to unsharded/dropped state &lt;tt&gt;0|0||0000...&lt;/tt&gt; However, an empty shard has the shard version &lt;tt&gt;0|0||epoch&lt;/tt&gt; and thinks the new shard version is compatible with its current one, so the empty shard doesn&apos;t drop its metadata.&lt;/p&gt;

&lt;p&gt;In this situation, another insert and query to the just dropped (now unsharded) collection will go to the primary that has stale metadata. The inserted doc will be skipped because the shard doesn&apos;t think this doc belongs to it (it thinks it&apos;s empty) based on its stale metadata.&lt;/p&gt;</description>
                <environment></environment>
        <key id="130284">SERVER-13531</key>
            <summary>Collection drop doesn&apos;t clean the shard version on empty shards</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Apr 2014 20:49:32 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:26 +0000</updated>
                            <resolved>Fri, 6 Jun 2014 14:43:47 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="542870" author="thomasr" created="Wed, 9 Apr 2014 21:13:42 +0000"  >&lt;p&gt;attached test fails on 2.4.10 and 2.6.0 as well.&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="41290" name="coll_drop.js" size="1323" author="siyuan.zhou@mongodb.com" created="Wed, 9 Apr 2014 20:49:32 +0000"/>
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