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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-79191] continuous_initial_sync.py Can Be in Rollback During FSM Teardown</title>
                <link>https://jira.mongodb.org/browse/SERVER-79191</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s possible for the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4ff092d683be418230ef28fa3f3c81833b82c570/buildscripts/resmokelib/testing/hooks/continuous_initial_sync.py&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ContinuousInitialSync hook&lt;/a&gt; to leave the cluster in rollback during FSM teardown (see &lt;a href=&quot;https://jira.mongodb.org/browse/BF-28126?focusedCommentId=5316952&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-5316952&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt; for more details), which can cause the error seen in BF-28126.&lt;/p&gt;

&lt;p&gt;It should be ensured that the topology is stable (e.g. by performing a write and ensuring it is replicated successfully to all nodes) before entering FSM teardown.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2398130">SERVER-79191</key>
            <summary>continuous_initial_sync.py Can Be in Rollback During FSM Teardown</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="13201">Fixed</resolution>
                                        <assignee username="sean.zimmerman@mongodb.com">Sean Zimmerman</assignee>
                                    <reporter username="brett.nawrocki@mongodb.com">Brett Nawrocki</reporter>
                        <labels>
                            <label>repl-shortlist</label>
                    </labels>
                <created>Fri, 21 Jul 2023 17:38:55 +0000</created>
                <updated>Mon, 29 Jan 2024 15:18:37 +0000</updated>
                            <resolved>Fri, 19 Jan 2024 14:15:59 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                    <fixVersion>7.0.6</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="6049210" author="xgen-internal-githook" created="Mon, 29 Jan 2024 15:17:30 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;seanzimm&apos;, &apos;email&apos;: &apos;102551488+seanzimm@users.noreply.github.com&apos;, &apos;username&apos;: &apos;seanzimm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79191&quot; title=&quot;continuous_initial_sync.py Can Be in Rollback During FSM Teardown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79191&quot;&gt;&lt;del&gt;SERVER-79191&lt;/del&gt;&lt;/a&gt;: Make sure topology is stable during ContinuousInitialSyncHook&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 290fbfb8c30649de9b12509ac0ca22ade1cf0f15&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/027db00f7684051d08c5b5d23d5d1d632e309871&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/027db00f7684051d08c5b5d23d5d1d632e309871&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6024497" author="xgen-internal-githook" created="Fri, 19 Jan 2024 01:04:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;seanzimm&apos;, &apos;email&apos;: &apos;102551488+seanzimm@users.noreply.github.com&apos;, &apos;username&apos;: &apos;seanzimm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79191&quot; title=&quot;continuous_initial_sync.py Can Be in Rollback During FSM Teardown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79191&quot;&gt;&lt;del&gt;SERVER-79191&lt;/del&gt;&lt;/a&gt;: Make sure topology is stable during ContinuousInitialSyncHook (#18033)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 0b8363faeb014d3dc3dea5089f2db5fcfee9d6ba&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d08038252cf0d1346a78399bb82d4f33b78345f2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d08038252cf0d1346a78399bb82d4f33b78345f2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5598862" author="JIRAUSER1265594" created="Fri, 28 Jul 2023 16:20:50 +0000"  >&lt;p&gt;Initial thoughts from looking at it this morning. The ContinuousInitialSync hook has a very similar structure to [ContinuousStepdown|&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/buildscripts/resmokelib/testing/hooks/stepdown.py&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/master/buildscripts/resmokelib/testing/hooks/stepdown.py&lt;/a&gt;] . I don&apos;t notice any additional concurrency mechanisms that stepdown uses that continuous initial sync does not. The thread is paused between tests and killed and restarted between suites.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;At a glance the methods for stepping up the new primary seem similar too, ContinuousInitialSync directly calls replSetStepUp while stepdown uses the fixture &lt;a href=&quot;https://github.com/10gen/mongo/blob/5944235d7cd94eb59a34c97374977d00ffb2edb5/buildscripts/resmokelib/testing/fixtures/replicaset.py#L660&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stepup_node&lt;/a&gt; but the code in ContiunousInitialSync seems to be exactly the same as that function. I will continue looking more into it but right now I don&apos;t see any specific reason why ContinuousInitialSync would have this problem but ContinuousStepdown does not&lt;/p&gt;</comment>
                            <comment id="5583552" author="max.hirschhorn@10gen.com" created="Fri, 21 Jul 2023 18:24:05 +0000"  >&lt;p&gt;I wonder if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4ff092d683be418230ef28fa3f3c81833b82c570/buildscripts/resmokelib/testing/hooks/continuous_initial_sync.py&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;continuous&amp;#95;initial&amp;#95;sync.py&lt;/a&gt; is missing some synchronization to quiesce the MongoDB cluster and ensure the topology is stable. The concurrency framework is written expecting the topology is stable when both of the $config.setup() and $config.teardown() functions are being called. The concurrency framework only expects elections, shutdowns, rollbacks, etc. during the execution of the $config.states functions. I don&apos;t think the problem we&apos;d have here would be specific to the multi&amp;#95;statement&amp;#95;transaction&amp;#95;simple.js FSM workload.&lt;/p&gt;

&lt;p&gt;This might be something better looked into by the Replication team.&lt;/p&gt;</comment>
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