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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-34675] shard should clear its own CollectionShardingState on dropCollection</title>
                <link>https://jira.mongodb.org/browse/SERVER-34675</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would eliminate a class of bugs (some which show up in BF&apos;s) where the setShardVersion for dropCollection is not sent due to a config failover.&lt;/p&gt;</description>
                <environment></environment>
        <key id="534037">SERVER-34675</key>
            <summary>shard should clear its own CollectionShardingState on dropCollection</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Apr 2018 17:29:52 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:50 +0000</updated>
                            <resolved>Fri, 4 May 2018 15:08:14 +0000</resolved>
                                    <version>3.7.7</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1884454" author="esha.maharishi@10gen.com" created="Mon, 7 May 2018 13:16:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, do you mean a SERVER ticket that specifically tracks the crash in renameCollection? (Anywhere we directly use CollectionShardingState::getMetadata(), which includes agg, createIndexes, and update, is susceptible to this bug, though they may not all lead to a crash - they may instead return incorrect results or allow changing an immutable field).&lt;/p&gt;</comment>
                            <comment id="1884301" author="siyuan.zhou@10gen.com" created="Mon, 7 May 2018 05:38:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt;, if this is indeed a bug and we are not going to fix it in this ticket, can we at least have a ticket to track it (if not this one), since the bug leads to a crash of secondary and&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34760&quot; title=&quot;Retries of _configsvrShardCollection may not send setShardVersion to primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34760&quot;&gt;&lt;del&gt;SERVER-34760&lt;/del&gt;&lt;/a&gt; only reduces but does not eliminate the likelihood of the crash.&lt;/p&gt;</comment>
                            <comment id="1882997" author="esha.maharishi@10gen.com" created="Fri, 4 May 2018 15:08:05 +0000"  >&lt;p&gt;I realized this would not work:&lt;/p&gt;

&lt;p&gt;1) config server sends dropCollection to all shards&lt;/p&gt;

&lt;p&gt;2) shard drops collection locally&lt;/p&gt;

&lt;p&gt;3) shard clears in-memory sharding state for dropped collection&lt;/p&gt;

&lt;p&gt;4) shard receives request on collection, which&#160;triggers shard to refresh, so shard updates in-memory sharding state&lt;/p&gt;

&lt;p&gt;5) config server removes collection from sharding catalog&lt;/p&gt;

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

&lt;p&gt;In this case, the shard will still end up with stale in-memory state after the drop.&lt;/p&gt;

&lt;p&gt;Closing as Works as Designed (though it is also buggy as designed).&lt;/p&gt;</comment>
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