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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-74312] Avoid issuing too many automerge requests in parallel</title>
                <link>https://jira.mongodb.org/browse/SERVER-74312</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, from a high level point of view, the auto-merger is:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Constructing a &amp;lt;shard, nss&amp;gt; map (that is being optimized under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73378&quot; title=&quot;Find &amp;lt;shard, nss&amp;gt; pairs with mergeable chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73378&quot;&gt;&lt;del&gt;SERVER-73378&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;for each shard:&lt;/li&gt;
	&lt;li&gt;- For each namespace&lt;/li&gt;
	&lt;li&gt;---- Issue an auto merger request (in parallel)&lt;/li&gt;
	&lt;li&gt;- Wait for previous merge requests to drain before throttling and issuing requests for next shard&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In presence of thousands of collections, this may result in performance issues:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Sending 100K network requests to the same shard in case of 100K collections with mergeable chunks on the same shard&lt;/li&gt;
	&lt;li&gt;The commit of merges (for different collections) will serialize on the CSRS under the chunks lock&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2273556">SERVER-74312</key>
            <summary>Avoid issuing too many automerge requests in parallel</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 Feb 2023 16:29:35 +0000</created>
                <updated>Tue, 7 Mar 2023 11:41:03 +0000</updated>
                            <resolved>Tue, 7 Mar 2023 11:41:03 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
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