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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-24725] Hidden Member switched sync source multiple times and then crashes during rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-24725</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a tag-aware sharded cluster with each node being a 3 member replicaset of which 1 member is hidden.&lt;/p&gt;

&lt;p&gt;In this particular instance, the hidden member keeps switching the sync source between Primary &amp;amp; the other Secondary and rolls back updates after every switch.&lt;/p&gt;

&lt;p&gt;After a couple of such switches and rollbacks, it enters into an invalid/inconsistent state and crashes.&lt;/p&gt;


&lt;p&gt;Attached is the log file for the mongod instance showing this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="295871">SERVER-24725</key>
            <summary>Hidden Member switched sync source multiple times and then crashes during rollback</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="3">Duplicate</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="darshan.shah@interactivedata.com">Darshan Shah</reporter>
                        <labels>
                            <label>RF</label>
                    </labels>
                <created>Wed, 22 Jun 2016 16:47:45 +0000</created>
                <updated>Thu, 14 Jul 2016 16:05:02 +0000</updated>
                            <resolved>Fri, 8 Jul 2016 14:16:30 +0000</resolved>
                                    <version>3.2.5</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1318075" author="thomas.schubert" created="Fri, 8 Jul 2016 14:16:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=darshan.shah%40interactivedata.com&quot; class=&quot;user-hover&quot; rel=&quot;darshan.shah@interactivedata.com&quot;&gt;darshan.shah@interactivedata.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for providing the complete logs; they align with my previous hypothesis so I will be closing this ticket as a duplicate. Please watch &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7200&quot; title=&quot;use oplog as op buffer on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7200&quot;&gt;&lt;del&gt;SERVER-7200&lt;/del&gt;&lt;/a&gt; for updates.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1305636" author="darshan.shah@interactivedata.com" created="Fri, 24 Jun 2016 15:04:31 +0000"  >&lt;p&gt;Log files from primary &amp;amp; secondary mongod from the same time we see the issue in the hidden secondary.&lt;/p&gt;</comment>
                            <comment id="1305631" author="darshan.shah@interactivedata.com" created="Fri, 24 Jun 2016 15:03:20 +0000"  >&lt;p&gt;Hi Thomas,&lt;/p&gt;

&lt;p&gt;Thanks for checking and providing details.&lt;/p&gt;

&lt;p&gt;Attaching the logs from the primary and secondary mongod logs from that time for your reference.&lt;br/&gt;
Please review and let me know if these logs confirm your suspicion.&lt;/p&gt;

&lt;p&gt;Thanks.&lt;/p&gt;</comment>
                            <comment id="1303895" author="thomas.schubert" created="Thu, 23 Jun 2016 08:03:32 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=darshan.shah%40interactivedata.com&quot; class=&quot;user-hover&quot; rel=&quot;darshan.shah@interactivedata.com&quot;&gt;darshan.shah@interactivedata.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this behavior. I believe the issue you describe will be corrected by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7200&quot; title=&quot;use oplog as op buffer on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7200&quot;&gt;&lt;del&gt;SERVER-7200&lt;/del&gt;&lt;/a&gt;. For additional discussion relating to the error you observed, please see its linked ticket, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23841&quot; title=&quot;Mongod always complain &amp;quot;Fatal assertion 18750 UnrecoverableRollbackError&amp;quot; after mongod abnormal termination&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23841&quot;&gt;&lt;del&gt;SERVER-23841&lt;/del&gt;&lt;/a&gt;. To confirm this diagnosis, would you please upload the logs from the other members of the replica set?&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="127989" name="mongod.log.txt" size="168666" author="darshan.shah@interactivedata.com" created="Wed, 22 Jun 2016 16:47:45 +0000"/>
                            <attachment id="128370" name="primary_mongod.zip" size="288912" author="darshan.shah@interactivedata.com" created="Fri, 24 Jun 2016 15:04:31 +0000"/>
                            <attachment id="128369" name="secondary_mongod.zip" size="166498" author="darshan.shah@interactivedata.com" created="Fri, 24 Jun 2016 15:04:31 +0000"/>
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