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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>[DOCS-15949] Investigate changes in SERVER-73394: Remove misleading operationsBlockedByRefresh metrics </title>
                <link>https://jira.mongodb.org/browse/DOCS-15949</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    Removed operationsBlockedByRefresh metrics of serverStatus:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/serverStatus/#mongodb-serverstatus-serverstatus.shardingStatistics.catalogCache.operationsBlockedByRefresh&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/command/serverStatus/#mongodb-serverstatus-serverstatus.shardingStatistics.catalogCache.operationsBlockedByRefresh&lt;/a&gt;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The operationsBlockedByRefresh counters are increased on mongos for every operation that use collection routing information even if the operation haven&apos;t been blocked by a catalog refresh.&lt;/p&gt;

&lt;p&gt;In fact all operations that requires collection routing information end up calling &#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0d5ad158ceb6fea1004034bcb78c82c9daf69eac/src/mongo/s/catalog_cache.cpp#L299&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CatalogCache::_getCollectionPlacementInfoAt&lt;/tt&gt;&lt;/a&gt; . In this function we unconditionally set the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0d5ad158ceb6fea1004034bcb78c82c9daf69eac/src/mongo/s/catalog_cache.cpp#L358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;operationBlockedBheindCatalogCacheRefres&lt;/a&gt; boolean to true and when the operation completes we execute &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0d5ad158ceb6fea1004034bcb78c82c9daf69eac/src/mongo/s/catalog_cache.cpp#L724-L753&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CatalogCache::checkAndRecordOperationBlockedByRefresh&lt;/tt&gt;&lt;/a&gt; that increase the metric counters.&lt;/p&gt;

&lt;p&gt;This metric has been introduced by &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; as part of PM-1633. &lt;a href=&quot;https://jira.mongodb.org/browse/PM-1633?focusedCommentId=4254897&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-4254897&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;The future flag for this project have been disabled because we discovered was causing performance regression&lt;/a&gt;.&lt;br/&gt;
This goal of this ticket is to remove this wrong and misleading metric to avoid confusion. &lt;/p&gt;
</description>
                <environment></environment>
        <key id="2282932">DOCS-15949</key>
            <summary>Investigate changes in SERVER-73394: Remove misleading operationsBlockedByRefresh metrics </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="kanchana.sekhar@mongodb.com">Kanchana Sekhar</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Mar 2023 10:47:12 +0000</created>
                <updated>Mon, 13 Nov 2023 17:34:55 +0000</updated>
                            <resolved>Wed, 19 Jul 2023 18:43:42 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5570670" author="kanchana.sekhar" created="Mon, 17 Jul 2023 14:09:02 +0000"  >&lt;p&gt;PR: &lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/pull/3951&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/pull/3951&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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