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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-61849] Make collection defragmenter cleanup asyncronous</title>
                <link>https://jira.mongodb.org/browse/SERVER-61849</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current cleanup of the defragmentation state is done in &lt;tt&gt;BalancerDefragmentationPolicyImpl::refreshCollectionDefragmentationStatus&lt;/tt&gt;. As part of the defragmentation state cleanup we perform the removal of the data size estimation from all the chunks, for collection with millions of chunks this could take up to seconds.Currently the cleanup is done synchronously in &lt;tt&gt;BalancerDefragmentationPolicyImpl::refreshCollectionDefragmentationStatus&lt;/tt&gt; and it will block the balancer round and the streaming action (since we are holding the _streamingMutex lock).&lt;/p&gt;

&lt;p&gt;My proposal is to introduce an ad-hoc defragmentation phase that will be responsible for performing the cleanup procedure. So that we can execute it asyncornously.&lt;/p&gt;

&lt;p&gt;Regarding the interruption of the defragmentation process I would structure it as follows: &lt;br/&gt;
 1. &lt;tt&gt;refreshCollectionDefragmentationStatus&lt;/tt&gt; set an interrupted flag on the collectionState&lt;br/&gt;
2. All the phases will stop producing actions if the interrupted flag is enabled and will eventually move to the subsequent phase.&lt;br/&gt;
3. The last phase will execute the clear of the data size&lt;br/&gt;
4. When all the phases are completed we can clear the collection entry in config.collections and remove the state from the _defragmentationState map&lt;/p&gt;</description>
                <environment></environment>
        <key id="1941174">SERVER-61849</key>
            <summary>Make collection defragmenter cleanup asyncronous</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Dec 2021 11:58:15 +0000</created>
                <updated>Tue, 6 Dec 2022 00:45:07 +0000</updated>
                            <resolved>Wed, 5 Jan 2022 12:15:05 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4255943" author="JIRAUSER1259531" created="Fri, 17 Dec 2021 11:52:50 +0000"  >&lt;p&gt;This ticket is intended just for performance optimisation and it is not a must have for epic delivery.&lt;/p&gt;</comment>
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