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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-51755] Introduce a sharding serializer for collection DDL coordinators</title>
                <link>https://jira.mongodb.org/browse/SERVER-51755</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This new component will be built on top of the current collection critical section and will be used to prevent DDL(drop, rename, shard, etc...) operations to be executed concurrently on the same collection, when running in a sharded cluster.&lt;/p&gt;

&lt;p&gt;Each DDL operation needs to enter the DDL critical section before to start and will release it on its cleanup. If a DDL operation tries to enter a critical section already occupied by another DDL operation, an exception will be thrown and will be propagated to the router.&lt;/p&gt;

&lt;p&gt;This component will be exposed by the CollectionShardingRuntime and will expose two main functions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Enter DDL critical section (may throw exception)&lt;/li&gt;
	&lt;li&gt;Exit DDL critical section&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1519594">SERVER-51755</key>
            <summary>Introduce a sharding serializer for collection DDL coordinators</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="3">Duplicate</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0</label>
                    </labels>
                <created>Tue, 20 Oct 2020 12:57:41 +0000</created>
                <updated>Tue, 10 May 2022 22:42:55 +0000</updated>
                            <resolved>Thu, 28 Jan 2021 08:31:53 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3453889" author="tommaso.tocci" created="Tue, 20 Oct 2020 13:46:56 +0000"  >&lt;p&gt;For sure we need to enter this critical section when we try to shard an unsharded collection, so that we won&apos;t run two shardCollection at the same time on the same collection.&lt;br/&gt;
 Moreover having in mind that all collections will be made soon sharded by default by PM-1967 , I think the short answer is yes: The DDL serializer will be used for both sharded and unsharded collections in&#160; sharded clusters.&lt;/p&gt;</comment>
                            <comment id="3453807" author="louis.williams" created="Tue, 20 Oct 2020 13:03:27 +0000"  >&lt;p&gt;Does this only apply to sharded collections or all collections?&lt;/p&gt;</comment>
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