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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-53394] Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD</title>
                <link>https://jira.mongodb.org/browse/SERVER-53394</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently set ShardingTaskExecutorPoolReplicaSetMatching to &quot;matchPrimaryNode&quot; by default for both MongoD and MongoS (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/04401a326046babcb390cc444f52699f732b3b2f/src/mongo/s/sharding_task_executor_pool.idl#L87-L93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). However, the &quot;matchPrimaryNode&quot; behavior can be problematic for topologies when multiple shardsvrs experience a rapid influx of cross-shard operations. We should disable this behavior on MongoD nodes but not MongoS nodes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1570514">SERVER-53394</key>
            <summary>Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="george.wangensteen@mongodb.com">George Wangensteen</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Dec 2020 18:27:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:30 +0000</updated>
                            <resolved>Fri, 29 Jan 2021 17:34:30 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.2.13</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="3619217" author="xgen-internal-githook" created="Wed, 17 Feb 2021 15:08:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;George Wangensteen&apos;, &apos;email&apos;: &apos;george.wangensteen@mongodb.com&apos;, &apos;username&apos;: &apos;gewa24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53394&quot; title=&quot;Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53394&quot;&gt;&lt;del&gt;SERVER-53394&lt;/del&gt;&lt;/a&gt; Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for mongod&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ac99b5cf6202e2941220a1f5f56b8223af1841e9)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b1754775cf6a95e35b7e8943ae2dda0080636d92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b1754775cf6a95e35b7e8943ae2dda0080636d92&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3605366" author="xgen-internal-githook" created="Mon, 8 Feb 2021 20:24:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;George Wangensteen&apos;, &apos;email&apos;: &apos;george.wangensteen@mongodb.com&apos;, &apos;username&apos;: &apos;gewa24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53394&quot; title=&quot;Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53394&quot;&gt;&lt;del&gt;SERVER-53394&lt;/del&gt;&lt;/a&gt; Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for mongod&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ac99b5cf6202e2941220a1f5f56b8223af1841e9)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c57358e4156ae4291f24fce1cf22ffc54f4dbb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c57358e4156ae4291f24fce1cf22ffc54f4dbb0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3585192" author="xgen-internal-githook" created="Wed, 27 Jan 2021 16:43:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;George Wangensteen&apos;, &apos;email&apos;: &apos;george.wangensteen@mongodb.com&apos;, &apos;username&apos;: &apos;gewa24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53394&quot; title=&quot;Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for MongoD&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53394&quot;&gt;&lt;del&gt;SERVER-53394&lt;/del&gt;&lt;/a&gt; Make ShardingTaskExecutorPoolReplicaSetMatching default to disabled for mongod&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac99b5cf6202e2941220a1f5f56b8223af1841e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac99b5cf6202e2941220a1f5f56b8223af1841e9&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>Downstream changes:&lt;br/&gt;
Configuration Changes (Atlas, STAR, docs)&lt;br/&gt;
The ShardingTaskExecutorPoolReplicaSetMatching server parameter (see &lt;a href=&quot;https://docs.mongodb.com/manual/reference/parameters/#param.ShardingTaskExecutorPoolReplicaSetMatching)&quot;&gt;https://docs.mongodb.com/manual/reference/parameters/#param.ShardingTaskExecutorPoolReplicaSetMatching)&lt;/a&gt; has a new possible value, &amp;quot;automatic&amp;quot;. This new value is now the default. The behavior of this new value depends on the process: on mongos, it is identical to the existing &amp;quot;matchPrimaryNode&amp;quot; option; on mongod, it is identical to the existing &amp;quot;disabled&amp;quot; option. (On mongos, this parameter determines the minimum size limit of the mongos instance&amp;#39;s connection pools to the secondaries of the cluster&amp;#39;s shards; on mongod, this parameter determines the minimum size limit of the mongod instance&amp;#39;s connection pools to the secondaries of _other_ shards in the cluster.)&lt;br/&gt;
&lt;br/&gt;
Command results changes (ADL, drivers, BIC, docs):&lt;br/&gt;
The connPoolStats command output now contains an additional field, &amp;quot;replicaSetMatchingStrategy&amp;quot;; the value of this field describes the actual policy used by that process to determine the min size of connection pools from that server to RS secondaries in (other) shards. The policy will either be &amp;quot;matchPrimaryNode&amp;quot;, &amp;quot;matchBusiestNode&amp;quot;, or &amp;quot;disabled&amp;quot;, with the behavior described by the existing docs for the STEPRSM parameter. Note that even if the &amp;quot;automatic&amp;quot; value is used to set the server parameter, the &amp;quot;replicaSetMatchingStrategy&amp;quot; field in the connPoolStats output will describe the _actual_ policy being used, not &amp;quot;automatic.&amp;quot; This contrasts with the output of using getParameter() to find the value of the STEPRSM parameter, which will display &amp;quot;automatic&amp;quot; if that is the value of the server parameter.&lt;br/&gt;
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