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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-57308] Further investigate slow deletion of chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-57308</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; title=&quot;Inconsistent delete performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57221&quot;&gt;&lt;del&gt;SERVER-57221&lt;/del&gt;&lt;/a&gt; highlighted performance problems on deletes for collections with more than one secondary index and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57307&quot; title=&quot;Improve deletion of config.chunks entries with hint and retries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57307&quot;&gt;&lt;del&gt;SERVER-57307&lt;/del&gt;&lt;/a&gt; mitigates the problem with the use of a hint for chunk documents deletion.&lt;/p&gt;

&lt;p&gt;However, the ~17x performance gain showed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; title=&quot;Inconsistent delete performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57221&quot;&gt;&lt;del&gt;SERVER-57221&lt;/del&gt;&lt;/a&gt; does not seem to correspond to the ~5x gain obtained when locally testing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57307&quot; title=&quot;Improve deletion of config.chunks entries with hint and retries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57307&quot;&gt;&lt;del&gt;SERVER-57307&lt;/del&gt;&lt;/a&gt; changes.&lt;/p&gt;

&lt;p&gt;Investigate what leads to such a difference. Some options to check would be: interference on the machine, documents size, presence of specific config server hooks/observers, number of secondaries, sharding-specific overhead (since the test was done on a plain RS).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1764049">SERVER-57308</key>
            <summary>Further investigate slow deletion of chunks</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="13202">Works as Designed</resolution>
                                        <assignee username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-1965-Cleanup</label>
                    </labels>
                <created>Mon, 31 May 2021 10:03:01 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:22 +0000</updated>
                            <resolved>Tue, 1 Jun 2021 07:19:56 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3850404" author="pierlauro.sciarelli" created="Tue, 1 Jun 2021 07:19:56 +0000"  >&lt;p&gt;Closing as &quot;Works as designed&quot; because there are no relevant differences in performance between the example in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57221&quot; title=&quot;Inconsistent delete performance on collections with multiple secondary indexes on same key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57221&quot;&gt;&lt;del&gt;SERVER-57221&lt;/del&gt;&lt;/a&gt; and the deletion of entries in &lt;tt&gt;config.chunks&lt;/tt&gt; as part of a drop collection.&lt;/p&gt;

&lt;p&gt;Testing on the virtual workstation for hours has shown very consistently a speed up of 5x-6x using the hint in both cases.&lt;/p&gt;</comment>
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