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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-53736] Resumable range deleter must use timestamps</title>
                <link>https://jira.mongodb.org/browse/SERVER-53736</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;By default, each range deletion task is scheduled on the executor at time (&lt;tt&gt;timestampMoveChunkFinished + &lt;a href=&quot;https://github.com/mongodb/mongo/blob/917e3e22cf21d71b1fb2a6649577c92a1beda78f/src/mongo/db/s/sharding_runtime_d_params.idl#L87-L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;15 mins&lt;/a&gt;)&lt;/tt&gt;. If a stepdown happens, at stepUp all pending range deletions &lt;a href=&quot;https://github.com/mongodb/mongo/blob/460b587740c5fa0504ecbf69191c00a7154713da/src/mongo/db/s/migration_util.cpp#L409-L410&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;are re-submitted&lt;/a&gt; at time (&lt;tt&gt;timeOfResubmit + 15 mins&lt;/tt&gt;) because the only persisted info is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4b6a89a429c39a4f0848e7723f7bda9d22576cf9/src/mongo/db/s/range_deletion_task.idl#L74-L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if a range deletion is delayed&lt;/a&gt; but not when it should have originally happened.&lt;/p&gt;

&lt;p&gt;This behavior makes it very easy to end up into problematic contexts such as:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;If a sufficient number of range deletions are rescheduled, the collection could be under pressure (because continuously &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9e1f0ea4f371a8101f96c84d2ecd3811d68cafb6/src/mongo/db/s/range_deletion_util.cpp#L318&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IX-locked&lt;/a&gt;) and the secondaries get very lagged because there is no syncrhonous wait for majority deletion and there are no timeouts between batches from different ranges.&lt;/li&gt;
	&lt;li&gt;If periodic stepdowns are happening (e.g. a stepdown every 10 mins), range deletions will never be performed.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1588744">SERVER-53736</key>
            <summary>Resumable range deleter must use timestamps</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Jan 2021 11:09:50 +0000</created>
                <updated>Tue, 6 Dec 2022 01:39:35 +0000</updated>
                            <resolved>Thu, 14 Jan 2021 16:47:31 +0000</resolved>
                                    <version>4.9.0</version>
                    <version>4.4.3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3565314" author="ratika.gandhi" created="Thu, 14 Jan 2021 16:47:32 +0000"  >&lt;p&gt;We will take care of this as a part of the larger undertaking on balancers.&#160;&lt;/p&gt;</comment>
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