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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>
    </build-info>


<item>
            <title>[SERVER-60728] Improved MDB crash recovery testing</title>
                <link>https://jira.mongodb.org/browse/SERVER-60728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MDB currently has powercycle and process termination tests which have historically discovered durability bugs. It&apos;s not obvious those are fundamentally insufficient, but we&apos;ve found other durability bugs when using other techniques. Specifically we can set up a mongodb cluster and:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Run a workload against the cluster&lt;/li&gt;
	&lt;li&gt;SIGSTOP one of the mongodb processes&lt;/li&gt;
	&lt;li&gt;Copy that process&apos; dbpath to a tmp path with direct I/O&lt;/li&gt;
	&lt;li&gt;SIGCONT the paused process&lt;/li&gt;
	&lt;li&gt;Start a mongod on the tmp path&lt;/li&gt;
	&lt;li&gt;Run validate on all collections in the tmp path&lt;/li&gt;
	&lt;li&gt;Repeat in a tight loop.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There&apos;s interest in permanently adding this to our testing suites. Attached is an unrefined (apologies) patch that can be used as a starting point in implementing the above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1899089">SERVER-60728</key>
            <summary>Improved MDB crash recovery testing</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>CA-PM</label>
                            <label>post-mortem</label>
                    </labels>
                <created>Fri, 15 Oct 2021 02:36:17 +0000</created>
                <updated>Mon, 6 Nov 2023 02:37:53 +0000</updated>
                            <resolved>Tue, 8 Feb 2022 01:36:26 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4341014" author="xgen-internal-githook" created="Tue, 8 Feb 2022 00:05:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60728&quot; title=&quot;Improved MDB crash recovery testing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60728&quot;&gt;&lt;del&gt;SERVER-60728&lt;/del&gt;&lt;/a&gt; Add a new test hook to simulate crashes and validate data files after recovery&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f61906c0621c146115b5f8e00b9b79c59ebc1088&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f61906c0621c146115b5f8e00b9b79c59ebc1088&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4216325" author="daniel.gottlieb@10gen.com" created="Tue, 30 Nov 2021 01:59:40 +0000"  >&lt;p&gt;I wouldn&apos;t say we understand the gap between the existing tests and what this proposes. What the patch offers did find some data corruption bugs that the existing tests seemed unable to uncover. It was requested we file a ticket to productionize the new testing, but it&apos;s not clear to me exactly what form this should take.&lt;/p&gt;</comment>
                            <comment id="4214885" author="connie.chen" created="Mon, 29 Nov 2021 16:08:41 +0000"  >&lt;p&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;, would you be able to answer &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;&apos;s&#160;question above?&lt;/p&gt;</comment>
                            <comment id="4175020" author="judah.schvimer" created="Mon, 8 Nov 2021 16:29:28 +0000"  >&lt;p&gt;Do we plan to add this testing to our existing terminate/kill passthroughs? Do we understand the gap between our existing tests and what this proposes?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2490513">SERVER-82781</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2473489">WT-11821</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2041073">SERVER-66273</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1896752">SERVER-60636</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="340578" name="stop_cont_crash_testing.diff" size="14898" author="daniel.gottlieb@mongodb.com" created="Fri, 15 Oct 2021 02:35:59 +0000"/>
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