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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-42011] Create concurrency suites to enable WiredTiger eviction debugging mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-42011</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-4477&quot; title=&quot;Add eviction debug mode and extra checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4477&quot;&gt;&lt;del&gt;WT-4477&lt;/del&gt;&lt;/a&gt; provides a new debugging option for eviction, lookaside, and reconciliation.  It would be useful to turn this on for at least one builder.&lt;/p&gt;</description>
                <environment></environment>
        <key id="828291">SERVER-42011</key>
            <summary>Create concurrency suites to enable WiredTiger eviction debugging mode</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Jun 2019 19:21:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:25 +0000</updated>
                            <resolved>Wed, 21 Aug 2019 14:28:43 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2380905" author="xgen-internal-githook" created="Wed, 21 Aug 2019 14:27:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42011&quot; title=&quot;Create concurrency suites to enable WiredTiger eviction debugging mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42011&quot;&gt;&lt;del&gt;SERVER-42011&lt;/del&gt;&lt;/a&gt; Create concurrency suite to enable WiredTiger eviction debugging mode&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54d445e84388ae82477b0094bb35cb11830056d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54d445e84388ae82477b0094bb35cb11830056d0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2377566" author="maria.vankeulen" created="Mon, 19 Aug 2019 17:27:45 +0000"  >&lt;p&gt;Thanks for the clarification, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If we&apos;re interested in testing the interaction between debug builds and eviction debugging, perhaps we could add the new concurrency suites but only run them on debug builds.&lt;/p&gt;</comment>
                            <comment id="2377316" author="sue.loverso" created="Mon, 19 Aug 2019 15:42:26 +0000"  >&lt;p&gt;We haven&apos;t done a side-by-side performance comparison but this additional debugging isn&apos;t just additional checking. The eviction debug mode changes algorithms to force more lookaside behavior. It would likely be a more noticeable impact than other debug-style checking. I would probably suggest being a bit more selective in turning it on, at least initially. Some tests or workloads may stress eviction more than others so the impact will vary.&lt;/p&gt;</comment>
                            <comment id="2374365" author="louis.williams" created="Thu, 15 Aug 2019 22:28:16 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sue.loverso&quot; class=&quot;user-hover&quot; rel=&quot;sue.loverso&quot;&gt;sue.loverso&lt;/a&gt;, how expensive is this eviction debugging? Making new concurrency suites just to enable these debug checks doesn&apos;t make sense to me without testing any additional features. Could we just enable this in all debug builds? Our debug builds already perform additional runtime checks, and are often slower than other builds.&lt;/p&gt;</comment>
                            <comment id="2356929" author="max.hirschhorn@10gen.com" created="Sat, 3 Aug 2019 21:02:36 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Based on my understanding of &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4477&quot; title=&quot;Add eviction debug mode and extra checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4477&quot;&gt;&lt;del&gt;WT-4477&lt;/del&gt;&lt;/a&gt;, I think adding new jstestfuzz_concurrent and jstestfuzz_concurrent_replication tasks with eviction debugging turned on makes sense.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maria.vankeulen&quot; class=&quot;user-hover&quot; rel=&quot;maria.vankeulen&quot;&gt;maria.vankeulen&lt;/a&gt;, the mutational (jstestfuzz) fuzzer is only able to detect cases where the server crashes, hangs, or corrupts data. In particular, it won&apos;t detect data correctness issues because it makes no assertions about the server&apos;s response. My impression for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42011&quot; title=&quot;Create concurrency suites to enable WiredTiger eviction debugging mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42011&quot;&gt;&lt;del&gt;SERVER-42011&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41492&quot; title=&quot;Disable WiredTiger cursor caching and introduce more aggressive file handle sweeps in testing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41492&quot;&gt;&lt;del&gt;SERVER-41492&lt;/del&gt;&lt;/a&gt;, and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41494&quot; title=&quot;Introduce more aggressive WiredTiger file handle sweeps in testing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41494&quot;&gt;&lt;del&gt;SERVER-41494&lt;/del&gt;&lt;/a&gt; is that we should be configuring these options in some of the &lt;tt&gt;concurrency&amp;#42;.yml&lt;/tt&gt; test suites as well.&lt;/p&gt;</comment>
                            <comment id="2354703" author="maria.vankeulen" created="Thu, 1 Aug 2019 18:05:24 +0000"  >&lt;p&gt;Based on my understanding of &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4477&quot; title=&quot;Add eviction debug mode and extra checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4477&quot;&gt;&lt;del&gt;WT-4477&lt;/del&gt;&lt;/a&gt;, I think adding new jstestfuzz_concurrent and jstestfuzz_concurrent_replication tasks with eviction debugging turned on makes sense. It seems like we should add them for the enterprise rhel 6.2 required builder as well as enterprise rhel 6.2 (majority read concern off).&lt;br/&gt;
CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;&lt;/p&gt;</comment>
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