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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-55001] Node entering rollback during stopSet() in step_down_during_draining.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-55001</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The primary and secondary (which was the former primary) have diverging oplogs. This is because we have set the primary catchup timeout to 0 seconds, and we immediately step up the new primary and it writes a no-op start-of-term entry. As a result, the secondary goes into rollback.&lt;/p&gt;

&lt;p&gt;There are two possible solutions:&lt;/p&gt;

&lt;p&gt;1. (Prevent rollback) Wait until the 20020&apos;s start-of-term oplog entry has been fetched by all nodes, by pausing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/76e12a94289be9539ce5f597d3006d0df6044c42/jstests/replsets/step_down_during_draining.js#L91&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. For example, adding a &quot;sleep(3000);&quot; prevented rollback. Of course, adding a sleep there wouldn&apos;t be a stable solution, but maybe we could add some kind of synchronization there so that all nodes have fetched 20020&apos;s entry. That way, when 20021 steps up, it will write its own start-of-term entry after 20020&apos;s entry, and the two oplogs will not diverge.&lt;/p&gt;

&lt;p&gt;2. (Work with possibility of rollback) Change step 9 to be &quot;w: 3&quot;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/76e12a94289be9539ce5f597d3006d0df6044c42/jstests/replsets/step_down_during_draining.js#L104&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. After this line, 20020 and 20022 should have completed rollback if they rolled back, and the three nodes should be in sync.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1641244">SERVER-55001</key>
            <summary>Node entering rollback during stopSet() in step_down_during_draining.js</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="vishnu.kaushik@mongodb.com">Vishnu Kaushik</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Mar 2021 19:49:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:38 +0000</updated>
                            <resolved>Tue, 9 Mar 2021 19:43:05 +0000</resolved>
                                                    <fixVersion>5.0.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3655317" author="xgen-internal-githook" created="Tue, 9 Mar 2021 19:24:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vishnu Kaushik&apos;, &apos;email&apos;: &apos;vishnu.kaushik@mongodb.com&apos;, &apos;username&apos;: &apos;kauboy26&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55001&quot; title=&quot;Node entering rollback during stopSet() in step_down_during_draining.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55001&quot;&gt;&lt;del&gt;SERVER-55001&lt;/del&gt;&lt;/a&gt; Allow rollback to complete before calling stopSet()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d09c95567beeb791e934a5ccece41984360bae9f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d09c95567beeb791e934a5ccece41984360bae9f&lt;/a&gt;&lt;/p&gt;</comment>
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