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    <title>MongoDB Jira</title>
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    <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-45409] Rollback-via-refetch should wait for aborted two-phase index build threads to exit</title>
                <link>https://jira.mongodb.org/browse/SERVER-45409</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Before rollback, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5298bc2f3a9d038e6bdab1b31347960289969152/src/mongo/db/repl/bgsync.cpp#L648-L658&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;abort and record all active index builds&lt;/a&gt; so that upon completion of rollback, we know which&lt;a href=&quot;#L1543&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;&#160;index builds may need to be restarted&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The IndexBuildsCoordinator::onRollback() function &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5298bc2f3a9d038e6bdab1b31347960289969152/src/mongo/db/index_builds_coordinator.cpp#L600&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does not wait for these index build threads to exit&lt;/a&gt;, which opens the possibility for index builds to run concurrently with rollback (not good).&lt;/p&gt;

&lt;p&gt;This can cause rollback to fail with errors like &quot;There&apos;s already an index with name &apos;a_1&apos; being built on the collection&quot;. This error is not an UnrecoverableRollbackError, so rollback-via-refetch will restart. On its next attempt, it no longer has information about the aborted index builds, and as a result, will not restart them. This leads to index inconsistencies.&lt;/p&gt;

&lt;p&gt;In general, any non-fatal error during rollback-via-refetch will result in two-phase index builds not being restarted. We should potentially store these aborted index builds at higher level to be more resilient to this issue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1079943">SERVER-45409</key>
            <summary>Rollback-via-refetch should wait for aborted two-phase index build threads to exit</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Jan 2020 23:05:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:35 +0000</updated>
                            <resolved>Thu, 30 Jan 2020 14:32:36 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2771771" author="xgen-internal-githook" created="Thu, 30 Jan 2020 00:21:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;louiswilliams&apos;, &apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45409&quot; title=&quot;Rollback-via-refetch should wait for aborted two-phase index build threads to exit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45409&quot;&gt;&lt;del&gt;SERVER-45409&lt;/del&gt;&lt;/a&gt; Rollback should wait for all index builds to complete. Fail rollback-via-refetch on the first attempt if index builds were aborted beforehand&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31d27b87be16f2ebb5fd76cd8aef9ab65378def4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31d27b87be16f2ebb5fd76cd8aef9ab65378def4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2722463" author="louis.williams" created="Mon, 13 Jan 2020 17:48:13 +0000"  >&lt;p&gt;Determine whether recoverable rollback is also affected.&lt;/p&gt;

&lt;p&gt;Update: recovery-to-stable (recoverable rollback) is not affected, because it relies on the durable catalog state to determine how to restart index builds.&lt;/p&gt;</comment>
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            <issuekey id="1056414">SERVER-45174</issuekey>
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