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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-46150] Disable unit test CreateAndCheckForCachePressure</title>
                <link>https://jira.mongodb.org/browse/SERVER-46150</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Lookaside score from WiredTiger fed into the calculation used for MongoDB snapshot window size calculation. Since the lookaside is being replaced by the history store and the cache-usage / cache-pressure behaviour and statistics are not clear at the moment, there is no replacement available to the lookaside score. While we investigate a replacement in the future (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5499&quot; title=&quot;Replace lookaside score statistic with something similar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5499&quot;&gt;&lt;del&gt;WT-5499&lt;/del&gt;&lt;/a&gt;), we have decided to set the lookaside score to 0 (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5576&quot; title=&quot;Temporarily add lookaside score stat and cache_overflow config option&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5576&quot;&gt;&lt;del&gt;WT-5576&lt;/del&gt;&lt;/a&gt;), but this will lead to the snapshot window not adjusting to the cache pressure MongoDB unit test tries to create.&lt;/p&gt;

&lt;p&gt;This ticket will stop running the unit test &lt;a href=&quot;https://github.com/mongodb/mongo/blob/00477b903ef7b06b4e561f8cca06f2ad580815a5/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit_test.cpp#L183&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CreateAndCheckForCachePressure&lt;/tt&gt;&lt;/a&gt;, till &lt;a href=&quot;https://jira.mongodb.org/browse/WT-5499&quot; title=&quot;Replace lookaside score statistic with something similar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5499&quot;&gt;&lt;del&gt;WT-5499&lt;/del&gt;&lt;/a&gt; comes up with an alternate way to determine cache pressure.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1147865">SERVER-46150</key>
            <summary>Disable unit test CreateAndCheckForCachePressure</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="3">Duplicate</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="sulabh.mahajan@mongodb.com">Sulabh Mahajan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Feb 2020 01:22:26 +0000</created>
                <updated>Fri, 29 May 2020 18:46:40 +0000</updated>
                            <resolved>Fri, 29 May 2020 18:46:39 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3144076" author="dianna.hohensee" created="Fri, 29 May 2020 18:46:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47997&quot; title=&quot;Remove cachePressureThreshold and isCacheUnderPressure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47997&quot;&gt;&lt;del&gt;SERVER-47997&lt;/del&gt;&lt;/a&gt; Removed this unit test. Closing as a dupe thereof.&lt;/p&gt;</comment>
                            <comment id="3054246" author="donald.anderson" created="Fri, 24 Apr 2020 14:28:50 +0000"  >&lt;p&gt;Thanks for the context on this.  It&apos;s quite possible that there is nothing to do for this.  I&apos;ll assign it to the Execution team backlog to just confirm that the test is removed or appropriately disabled.&lt;/p&gt;</comment>
                            <comment id="3054081" author="dianna.hohensee" created="Fri, 24 Apr 2020 12:55:21 +0000"  >&lt;p&gt;Sure, you can assign it to execution to remove the test.&lt;/p&gt;

&lt;p&gt;I thought this unit test was already disabled? Hasn&apos;t the lookaside score been set to a constant 0 with the WT durable history drop, making the CreateAndCheckForCachePressure unit test fail? I don&apos;t see any BFG/BF tickets.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5499&quot; title=&quot;Replace lookaside score statistic with something similar&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5499&quot;&gt;&lt;del&gt;WT-5499&lt;/del&gt;&lt;/a&gt; is supposed to revisit whether any performance issues arise with maintaining a 5 second window of history. If the lookaside score is set to a constant 0 right now, MongoDB will default to establishing a 5 (adjustable server setting) second history window by not moving the oldest_timestamp forward until there is a 5 second window behind the stable_timestamp. Aside from checking whether there are any performance issues keeping extra history, I do not think there is any further work to be done by WT for MongoDB v4.4+ on this subject.&lt;/p&gt;</comment>
                            <comment id="3053509" author="donald.anderson" created="Thu, 23 Apr 2020 20:59:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, I&apos;m wondering what actions the storage engine group can do about this ticket?&#160; We don&apos;t have a lookaside table going forward and there is currently no equivalent way to measure cache pressure. If this test simply doesn&apos;t make sense anymore can I assign this to your team to deal with removing it?&lt;/p&gt;

&lt;p&gt;(&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.gorrod&quot; class=&quot;user-hover&quot; rel=&quot;alexander.gorrod&quot;&gt;alexander.gorrod&lt;/a&gt;&#160;thought you might best answer these questions).&lt;/p&gt;</comment>
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