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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-25061] Make CollectionShardingState a decoration on Collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-25061</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the &lt;tt&gt;CollectionShardingState&lt;/tt&gt; is kept on a map, which tracks the set of {{Collection}}s on the server. We should instead make it a decoration on the Collection in order to avoid the separate map lookup and mutex.&lt;/p&gt;

&lt;p&gt;This also better ties the lifetime of a collection with that of its sharding state and allows us to potentially prevent direct drop of sharded collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="301086">SERVER-25061</key>
            <summary>Make CollectionShardingState a decoration on Collection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Jul 2016 14:24:06 +0000</created>
                <updated>Tue, 6 Dec 2022 04:21:33 +0000</updated>
                            <resolved>Thu, 19 Dec 2019 14:25:06 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2649705" author="sheeri.cabral" created="Thu, 19 Dec 2019 14:25:06 +0000"  >&lt;p&gt;This is not a design change we want to make right now; if we find the pressing need in the future we can reopen.&lt;/p&gt;</comment>
                            <comment id="1728858" author="kaloian.manassiev" created="Fri, 17 Nov 2017 15:30:09 +0000"  >&lt;p&gt;Turns out that these calls cause contention on &lt;tt&gt;ShardingState::_mutex&lt;/tt&gt; which ends up being called frequently. Because of this I am reopening this ticket.&lt;/p&gt;</comment>
                            <comment id="1449660" author="schwerin" created="Mon, 5 Dec 2016 21:12:04 +0000"  >&lt;p&gt;There&apos;s no pressing need for this. If it comes up as part of future work, we can do it under separate cover then.&lt;/p&gt;</comment>
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