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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-80722] Rationalize Catalog Cache&apos; statistics</title>
                <link>https://jira.mongodb.org/browse/SERVER-80722</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;serverStatus&lt;/tt&gt; command and the FTDC data files report general statistics on the server. As part of this, there is a section dedicated to the &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/serverStatus/#shardingstatistics&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Catalog Cache&lt;/a&gt;:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;shardingStatistics : {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  ...&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   catalogCache : {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      numDatabaseEntries : Long(&quot;&amp;lt;num&amp;gt;&quot;),&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;In case of the FTDC file, this information can be graphically represented by T2:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/473533/473533_image-2023-09-05-14-31-48-034.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;One goal of this ticket is to identify metrics that can be considered useful and clear for investigating the behavior of the Catalog Cache (i.e., it shouldn&apos;t need to be a Sharding expert to interpreter these metrics).&lt;/p&gt;

&lt;p&gt;Ideally, for both collection and database metadata, we would need (TBD):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;number of the entries in the cache (TBD: stale and non-stale?)&lt;/li&gt;
	&lt;li&gt;number of cache misses (TBD: and cache hits?)&lt;/li&gt;
	&lt;li&gt;number of incremental refreshes started/completed (only for collection metadata)&lt;/li&gt;
	&lt;li&gt;number of full refreshes started/completed&lt;/li&gt;
	&lt;li&gt;number of failed refreshes&lt;/li&gt;
	&lt;li&gt;time spent waiting for refreshes (in milliseconds)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;On the other hand, T2 should be fixed and/or improved to represent this information in the best way (for example, it currently shows &lt;tt&gt;threads&lt;/tt&gt; as unit of the &lt;tt&gt;totalRefreshWaitTimeMicros&lt;/tt&gt; metric, which is a definitely a bug). Consequently, some tickets for the Server Triage &amp;amp; Release team should be created as a part of this work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2434006">SERVER-80722</key>
            <summary>Rationalize Catalog Cache&apos; statistics</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Tue, 5 Sep 2023 12:57:54 +0000</created>
                <updated>Thu, 26 Oct 2023 09:56:59 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
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                                        <issuelink>
            <issuekey id="2434023">SERVER-80724</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2436895">SERVER-80868</issuekey>
        </issuelink>
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            <issuekey id="517998">SERVER-34164</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="473533" name="image-2023-09-05-14-31-48-034.png" size="42568" author="antonio.fuschetto@mongodb.com" created="Tue, 5 Sep 2023 12:31:49 +0000"/>
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