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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-41244] The WT inMemory storage engine needs an alternative metric to determine cache pressure for the snapshot window size controls</title>
                <link>https://jira.mongodb.org/browse/SERVER-41244</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The WT inMemory engine does not use a persisted lookaside table for cache overflow, so it needs to look at something other than LAS table writes to determine cache pressure.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36956&quot; title=&quot;Replace the statistic that dynamically resizes the snapshot history window&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36956&quot;&gt;&lt;del&gt;SERVER-36956&lt;/del&gt;&lt;/a&gt; introduced the problem for the inMemory engine. Perf testing revealed the problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="772343">SERVER-41244</key>
            <summary>The WT inMemory storage engine needs an alternative metric to determine cache pressure for the snapshot window size controls</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 May 2019 17:01:17 +0000</created>
                <updated>Thu, 6 Jun 2019 13:23:56 +0000</updated>
                            <resolved>Thu, 6 Jun 2019 13:23:35 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2273720" author="dianna.hohensee" created="Thu, 6 Jun 2019 13:23:35 +0000"  >&lt;p&gt;I&apos;m closing this as Won&apos;t Fix in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41560&quot; title=&quot;MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41560&quot;&gt;&lt;del&gt;SERVER-41560&lt;/del&gt;&lt;/a&gt;. As described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41560&quot; title=&quot;MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41560&quot;&gt;&lt;del&gt;SERVER-41560&lt;/del&gt;&lt;/a&gt;, we cannot run transactions on an inMemory replica set member in v4.2. Therefore, there is currently no need to maintain snapshot history for the inMemory storage engine. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41560&quot; title=&quot;MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41560&quot;&gt;&lt;del&gt;SERVER-41560&lt;/del&gt;&lt;/a&gt; will set the window size to 0 for nodes running the inMemory storage engine.&lt;/p&gt;</comment>
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            <issuekey id="791232">SERVER-41560</issuekey>
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            <issuekey id="788013">WT-4842</issuekey>
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