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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-73659] Account for size of KVMap in LRUKeyValue cache memory budget tracking</title>
                <link>https://jira.mongodb.org/browse/SERVER-73659</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71882&quot; title=&quot;Add serverStatus metric for the number of entries evicted from the telemetry store&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71882&quot;&gt;&lt;del&gt;SERVER-71882&lt;/del&gt;&lt;/a&gt;, the size of the BSON key and telemetryMetrics value are included in LRUKeyValue memory tracking. However, the size of KVMap, which holds a int_32 hash of the cache keys and pointers to the associated key&apos;s position in KVList, should also be included in memory tracking.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;LRUKeyValue should maintain its own budge tracker for this overhead cost. It might make sense to replace the estimator from LRUBudgetTracker with a lambda:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;template &amp;lt;typename K, typename V&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;class&lt;/span&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; LRUBudgetTracker {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public&lt;/span&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;
		&lt;/tr&gt;
				&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;LRUBudgetTracker(size_t maxBudget) : _max(maxBudget), _current(&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&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;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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&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; onAdd(&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; K&amp;amp; k, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; V&amp;amp; v, std::function&amp;lt;size_t(&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; K&amp;amp;, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; V&amp;amp;)&amp;gt; estimator)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;{ _current += estimator(k, v); } &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;This would call the estimator defined in LRUKeyValue which would have a flag for including overhead size or not in total size. In case of classic plan cache, we only want to know number of entries. We do not care about the size of the keys, size of the plans, or size of overhead. However, we do care about size of overhead for SBE plan cache and telemetry.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2253985">SERVER-73659</key>
            <summary>Account for size of KVMap in LRUKeyValue cache memory budget tracking</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="maddie.zechar@mongodb.com">Maddie Zechar</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Feb 2023 18:25:13 +0000</created>
                <updated>Wed, 24 May 2023 12:30:52 +0000</updated>
                            <resolved>Thu, 27 Apr 2023 18:24:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5448386" author="xgen-internal-githook" created="Wed, 24 May 2023 12:30:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Anton Korshunov&apos;, &apos;email&apos;: &apos;anton.korshunov@mongodb.com&apos;, &apos;username&apos;: &apos;antkorsh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76769&quot; title=&quot;Complete TODO listed in SERVER-73659&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76769&quot;&gt;&lt;del&gt;SERVER-76769&lt;/del&gt;&lt;/a&gt; Complete TODO listed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73659&quot; title=&quot;Account for size of KVMap in LRUKeyValue cache memory budget tracking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73659&quot;&gt;&lt;del&gt;SERVER-73659&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec7fbab0ecdbe68bcfbadc3dff5f91d3c5782119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec7fbab0ecdbe68bcfbadc3dff5f91d3c5782119&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5378806" author="david.storch" created="Wed, 26 Apr 2023 19:34:46 +0000"  >&lt;p&gt;Marking this for re-triage. I filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76574&quot; title=&quot;Improve LRUKeyValue to avoid storing keys twice&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76574&quot;&gt;&lt;del&gt;SERVER-76574&lt;/del&gt;&lt;/a&gt; about avoiding storing keys twice in &lt;tt&gt;LRUKeyValue&lt;/tt&gt;. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73649&quot; title=&quot;Improve SBE plan cache BudgetEstimator to incorporate the size of the key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73649&quot;&gt;&lt;del&gt;SERVER-73649&lt;/del&gt;&lt;/a&gt; tracks the work to actually account for the size of the key in the plan cache budget estimators.&lt;/p&gt;

&lt;p&gt;I believe that we can close this ticket as &quot;Won&apos;t Fix&quot;. While we could account for the overhead of &lt;tt&gt;LRUKeyValue::_kvMap&lt;/tt&gt;, I&apos;m not sure that we really need to do so. It seems sufficient if the sum of the size estimates of the (key, value) pairs stored within the data structure fit within the budget.&lt;/p&gt;

&lt;p&gt;If we do decide not to do this ticket, note that there is a &quot;TODO&quot; comment in the code base that needs to be cleaned up before this ticket is resolved.&lt;/p&gt;</comment>
                            <comment id="5201099" author="anton.korshunov" created="Wed, 15 Feb 2023 16:25:20 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73649?focusedCommentId=5201093&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-5201093&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this&lt;/a&gt; comment.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2253899">SERVER-73649</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2326420">SERVER-76622</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2330368">SERVER-76769</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2325350">SERVER-76574</issuekey>
        </issuelink>
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