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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-59683] Make LRU cache utility more generic so that it can limit its size by bytes</title>
                <link>https://jira.mongodb.org/browse/SERVER-59683</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The base &lt;tt&gt;PlanCache&lt;/tt&gt; implementation uses the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c96a409f1b61384d9ca5c464e9ec55b05f6507d5/src/mongo/db/query/lru_key_value.h#L61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;LRUKeyValue&lt;/a&gt; store for caching plans. This class implements a least recently used (LRU) eviction policy based on the number of entries in the cache, which is set upon construction. This is fine for the classic &lt;tt&gt;PlanCache&lt;/tt&gt; but in SBE the eviction policy should be based on memory consumption rather than on a number of entries. That is, we should be able to track a total amount of memory occupied by the plan cache entries and start eviction when it reaches a pre-defined limit set via a server configuration parameter.&lt;/p&gt;

&lt;p&gt;Given that we&apos;re looking to reuse this LRU store both for the classic and SBE engines, we need to abstract out the logic dealing with the cache size into a separate interface with two implementations - one would compute the size based on the number of cache entries, another one based on the total size of the entries - and refactor &lt;tt&gt;LRUKeyValue&lt;/tt&gt; to support this new interface.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1863990">SERVER-59683</key>
            <summary>Make LRU cache utility more generic so that it can limit its size by bytes</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="alexander.ignatyev@mongodb.com">Alexander Ignatyev</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Aug 2021 11:32:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:04 +0000</updated>
                            <resolved>Fri, 17 Sep 2021 19:03:21 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4106584" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:28:51 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4069150" author="xgen-internal-githook" created="Fri, 17 Sep 2021 18:04:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alexander Ignatyev&apos;, &apos;email&apos;: &apos;alexander.ignatyev@mongodb.com&apos;, &apos;username&apos;: &apos;aligusnet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59683&quot; title=&quot;Make LRU cache utility more generic so that it can limit its size by bytes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59683&quot;&gt;&lt;del&gt;SERVER-59683&lt;/del&gt;&lt;/a&gt; Extract BudgetEstimator logic from LRU cache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d22a8b46abe0bcdbcbe1c84b0e22f6b2c9dc1d87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d22a8b46abe0bcdbcbe1c84b0e22f6b2c9dc1d87&lt;/a&gt;&lt;/p&gt;</comment>
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