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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-28448] Shard find commands get unnecessarily serialized by the ShardingState refresh rate limiting</title>
                <link>https://jira.mongodb.org/browse/SERVER-28448</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The find command implementation in 3.2 indiscriminately calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.12/src/mongo/db/commands/find_cmd.cpp#L263&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ShardingState::refreshMetadataIfNeeded&lt;/tt&gt;&lt;/a&gt; even if no migrations or shard version mismatch has been found for the collection being queried.&lt;/p&gt;

&lt;p&gt;This is bad, because the refreshMetadataIfNeeded call is internally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.12/src/mongo/db/s/sharding_state.cpp#L410&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rate limited&lt;/a&gt; to at most 3 concurrent callers in order to not overwhelm the config server if refresh &quot;is needed&quot;. However the rate limiting is done at the wrong place - where the in-memory check is done instead when the refresh from the config server is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.12/src/mongo/db/s/sharding_state.cpp#L458 performed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;actually&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This check should only be done if stale version has been hit and not on all occasions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="367336">SERVER-28448</key>
            <summary>Shard find commands get unnecessarily serialized by the ShardingState refresh rate limiting</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 Mar 2017 16:01:28 +0000</created>
                <updated>Wed, 6 Dec 2017 21:13:13 +0000</updated>
                            <resolved>Thu, 6 Apr 2017 11:33:53 +0000</resolved>
                                    <version>3.2.12</version>
                                    <fixVersion>3.2.13</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1542362" author="xgen-internal-githook" created="Thu, 6 Apr 2017 11:27:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28447&quot; title=&quot;Migration critical section for one collection will block finds for any other sharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28447&quot;&gt;&lt;del&gt;SERVER-28447&lt;/del&gt;&lt;/a&gt;/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28448&quot; title=&quot;Shard find commands get unnecessarily serialized by the ShardingState refresh rate limiting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28448&quot;&gt;&lt;del&gt;SERVER-28448&lt;/del&gt;&lt;/a&gt; Only refresh metadata or wait for critical section on StaleConfigException&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5a5098ea760396adbb9b096bed6c30357ab3cacd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5a5098ea760396adbb9b096bed6c30357ab3cacd&lt;/a&gt;&lt;/p&gt;</comment>
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