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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-85857] Avoid closing the connections with ARS destruction by waiting for all responses</title>
                <link>https://jira.mongodb.org/browse/SERVER-85857</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80838&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-80838&lt;/a&gt; made it so that any pending child writes of parent writes of type WWSKWID are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/write_ops/batch_write_exec.cpp#L693&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;canceled&lt;/a&gt; (by breaking out of the ARS execution loop) with &lt;tt&gt;ErrorCodes::CallBackCanceled&lt;/tt&gt; as per the default behavior of mongo RPC. This causes the connections to those shards to be closed in the ConnectionPool dropping the number of active connections. When a new request comes in to connect to those shards, more CPU time is spent establishing SSL/TLS connection impacting performance during higher write rates.&lt;/p&gt;

&lt;p&gt;One approach is to cancel the requests out of band by sending a killOps and cancel any pending write operation at mongod - but even that takes a network RTT to complete. It would be better to wait for the pending shards&apos; responses and discard them without processing. We would still be faster the majority of the time when shards are co-located in the same zone. In the cases where the shards are in other zones that take a longer time to respond, we wouldn&apos;t be performing any worse than what it was earlier.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2559833">SERVER-85857</key>
            <summary>Avoid closing the connections with ARS destruction by waiting for all responses</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="13201">Fixed</resolution>
                                        <assignee username="abdul.qadeer@mongodb.com">Abdul Qadeer</assignee>
                                    <reporter username="abdul.qadeer@mongodb.com">Abdul Qadeer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jan 2024 15:27:17 +0000</created>
                <updated>Fri, 2 Feb 2024 14:11:45 +0000</updated>
                            <resolved>Fri, 2 Feb 2024 14:11:44 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="6061599" author="xgen-internal-githook" created="Fri, 2 Feb 2024 06:04:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Abdul Qadeer&apos;, &apos;email&apos;: &apos;abdul.qadeer@mongodb.com&apos;, &apos;username&apos;: &apos;zorro786&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85857&quot; title=&quot;Avoid closing the connections with ARS destruction by waiting for all responses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85857&quot;&gt;&lt;del&gt;SERVER-85857&lt;/del&gt;&lt;/a&gt; Wait for ARS responses without processing them for WriteWithoutShardKeyWithId (#18499)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: abb4172161ca73618e9489d70a04476e2519779f&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/217261c88f10bf6d1ec99f77e260d712ce378122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/217261c88f10bf6d1ec99f77e260d712ce378122&lt;/a&gt;&lt;/p&gt;</comment>
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