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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-46396] Add metrics to track number of operations blocked behind a catalog cache refresh</title>
                <link>https://jira.mongodb.org/browse/SERVER-46396</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Text from scope document:&lt;/p&gt;

&lt;p&gt;&quot;Count and percentage of number of queries that are no longer blocked, but would have been blocked on a refresh&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1184662">SERVER-46396</key>
            <summary>Add metrics to track number of operations blocked behind a catalog cache refresh</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Feb 2020 19:20:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:43 +0000</updated>
                            <resolved>Tue, 14 Apr 2020 13:41:05 +0000</resolved>
                                                    <fixVersion>4.2.7</fixVersion>
                    <fixVersion>4.4.0-rc2</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3042598" author="xgen-internal-githook" created="Thu, 16 Apr 2020 14:33:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46396&quot; title=&quot;Add metrics to track number of operations blocked behind a catalog cache refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46396&quot;&gt;&lt;del&gt;SERVER-46396&lt;/del&gt;&lt;/a&gt; Add metrics to track number of operations blocked behind a catalog cache refresh&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8d136e00f5a204609403075ccd96fceb8d6e8ea7)&lt;/p&gt;

&lt;p&gt;(chunk_bounds_util.js cherry picked from commit aefce507386045fe6a77eebcbec567000a6a98e5&lt;br/&gt;
authored by Cheahuychou Mao (cheahuychou on Github))&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7545d9ffa5f7c980a1619d419e8fc03647e86cc5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7545d9ffa5f7c980a1619d419e8fc03647e86cc5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3042509" author="xgen-internal-githook" created="Thu, 16 Apr 2020 14:00:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46396&quot; title=&quot;Add metrics to track number of operations blocked behind a catalog cache refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46396&quot;&gt;&lt;del&gt;SERVER-46396&lt;/del&gt;&lt;/a&gt; Add metrics to track number of operations blocked behind a catalog cache refresh&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8d136e00f5a204609403075ccd96fceb8d6e8ea7)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21f1f40e9ffb5cd169a5a3aca16ecd93b4a30189&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21f1f40e9ffb5cd169a5a3aca16ecd93b4a30189&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3037034" author="xgen-internal-githook" created="Mon, 13 Apr 2020 16:21:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46396&quot; title=&quot;Add metrics to track number of operations blocked behind a catalog cache refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46396&quot;&gt;&lt;del&gt;SERVER-46396&lt;/del&gt;&lt;/a&gt; Add metrics to track number of operations blocked behind a catalog cache refresh&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8d136e00f5a204609403075ccd96fceb8d6e8ea7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8d136e00f5a204609403075ccd96fceb8d6e8ea7&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>Added new metric under shardingStatistics.catalogCache that will only be incremented on mongos:&lt;br/&gt;
&lt;br/&gt;
&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/serverStatus/#shardingstatistics&quot;&gt;https://docs.mongodb.com/manual/reference/command/serverStatus/#shardingstatistics&lt;/a&gt;&lt;br/&gt;
&lt;br/&gt;
It will be the field OperationsBlockedByRefresh, which will be a container with six counts:&lt;br/&gt;
&lt;br/&gt;
OperationsBlockedByRefresh.countAllOperations&lt;br/&gt;
OperationsBlockedByRefresh.countInserts&lt;br/&gt;
OperationsBlockedByRefresh.countQueries&lt;br/&gt;
OperationsBlockedByRefresh.countUpdates&lt;br/&gt;
OperationsBlockedByRefresh.countDeletes&lt;br/&gt;
OperationsBlockedByRefresh.countCommands&lt;br/&gt;
&lt;br/&gt;
This metric will track any operations that flow through the mongos/router and had to block on a catalog cache refresh during the operation. &lt;br/&gt;
&lt;br/&gt;
This metric will be backported back to 4.2.</customfieldvalue>

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