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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-60204] Idea - collect the exact sequence of visited checkpoints in failed tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-60204</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This comes from discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt;&#160;about possible relation of&#160;PM-2248&#160;thread liveness monitoring and&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42308&quot; title=&quot;Improve synchronization between two fail points&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42308&quot;&gt;SERVER-42308&lt;/a&gt;&#160;that proposes to make it possible to trigger failpoints based on previously reached failpoints.&lt;/p&gt;

&lt;p&gt;This idea is slightly different - when in debug mode, collect the exact sequence of visited checkpoints defined by the instrumentation of thread liveness monitoring and log them if the test fails. This way we will have the exact sequence of what happened in the code before the test failed.&lt;/p&gt;

&lt;p&gt;The plan of&#160;PM-2248 was to dump stacks for instrumented threads in the failed tests anyway, but with timestamps. Timestamps are not sufficiently accurate and cannot be relied up to reason on extremely narrow races between multiple threads. This is just an incremental improvement to the planned feature, not much extra effort.&lt;/p&gt;

&lt;p&gt;Lingzhi said: &quot;Yes, that would be helpful. It is an idea similar to undoDB but we keep track of the last x sequences ourselves. But I still think it is valuable to be able to examine possible interleaving in unittests instead of integration tests. I know STM team has a project to integrate some thread/network fuzzing into our tests. So maybe that&apos;s good enough. In that case, having the checkpoint sequence logged will be helpful.&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1882884">SERVER-60204</key>
            <summary>Idea - collect the exact sequence of visited checkpoints in failed tests</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="andrew.shuvalov@mongodb.com">Andrew Shuvalov</reporter>
                        <labels>
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                <created>Fri, 24 Sep 2021 15:21:16 +0000</created>
                <updated>Tue, 6 Dec 2022 00:54:47 +0000</updated>
                            <resolved>Fri, 23 Sep 2022 18:06:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4851814" author="ratika.gandhi" created="Fri, 23 Sep 2022 18:06:57 +0000"  >&lt;p&gt;Since the prereq work (PM-2248) won&apos;t be done, we can&apos;t schedule this work.&#160;&lt;/p&gt;</comment>
                            <comment id="4849000" author="connie.chen" created="Thu, 22 Sep 2022 17:13:51 +0000"  >&lt;p&gt;Putthing this in to &quot;Needs Scheduling&quot; for Sharding NY to review as Service Arch has decided that we will not pursue the Thread Liveness Monitoring Project (PM-2248)&lt;/p&gt;</comment>
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