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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-51255] rollback persists resumable index info before index build thread is cleaned up</title>
                <link>https://jira.mongodb.org/browse/SERVER-51255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When an index build is interrupted for shutdown, the index build thread is responsible for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cadb990e1ac4229bcf419f47c82656b6458faf8a/src/mongo/db/catalog/index_builds_manager.cpp#L336&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;persisting the resumable information to disk&lt;/a&gt;. This is done in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cadb990e1ac4229bcf419f47c82656b6458faf8a/src/mongo/db/index_builds_coordinator.cpp#L2358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexBuildsCoordinator::_cleanUpTwoPhaseAfterFailure()&lt;/a&gt; function.&lt;/p&gt;

&lt;p&gt;For rollback, the resumable index build information is written to disk in the thread (typically &lt;b&gt;BackgroundSync&lt;/b&gt;) that is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cadb990e1ac4229bcf419f47c82656b6458faf8a/src/mongo/db/index_builds_coordinator.cpp#L1418&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stopping the index build&lt;/a&gt; before starting the rollback process. The state of the index build thread is unclear at this point. In most cases, the index build is in a valid state for us to extract the resumable index build information&lt;/p&gt;

&lt;p&gt;This inconsistency between rollback and shutdown with respect to writing out the resumable index information means that we would either have to:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;synchronize the shutdown of the index build thread with the rollback abort thread; or&lt;/li&gt;
	&lt;li&gt;have the index build thread write out the resumable index build state under both rollback and shutdown scenarios.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1496669">SERVER-51255</key>
            <summary>rollback persists resumable index info before index build thread is cleaned up</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                            <label>pm-1344</label>
                    </labels>
                <created>Wed, 30 Sep 2020 22:21:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:35 +0000</updated>
                            <resolved>Thu, 8 Oct 2020 14:49:26 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3427121" author="xgen-internal-githook" created="Tue, 6 Oct 2020 00:47:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51255&quot; title=&quot;rollback persists resumable index info before index build thread is cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51255&quot;&gt;&lt;del&gt;SERVER-51255&lt;/del&gt;&lt;/a&gt; rollback persists resumable index build info after joining builder thread&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae16f30da8c3acc89ead3ff6a753b2ad3985121d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae16f30da8c3acc89ead3ff6a753b2ad3985121d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3427079" author="xgen-internal-githook" created="Mon, 5 Oct 2020 23:49:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51255&quot; title=&quot;rollback persists resumable index info before index build thread is cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51255&quot;&gt;&lt;del&gt;SERVER-51255&lt;/del&gt;&lt;/a&gt; clean up log message in MultiIndexBlock::_writeStateToDisk()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ec3484ee93c60e34cd26b336943d1e514b2b835&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ec3484ee93c60e34cd26b336943d1e514b2b835&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3426889" author="xgen-internal-githook" created="Mon, 5 Oct 2020 23:08:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51255&quot; title=&quot;rollback persists resumable index info before index build thread is cleaned up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51255&quot;&gt;&lt;del&gt;SERVER-51255&lt;/del&gt;&lt;/a&gt; log _runIndexBuildInner() result when joining thread after commit/abort&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb62d034c5cdf7df6f760be0f93cc057c812fd75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb62d034c5cdf7df6f760be0f93cc057c812fd75&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3420815" author="benety.goh" created="Thu, 1 Oct 2020 15:13:26 +0000"  >&lt;p&gt;Currently index builds are interrupted with the same IndexBuildAborted error code for both resumable (abortIndexBuild oplog entry) and non-resumable (rollback) scenarios. We could consider using a different error code (maybe IndexBuildAbortedForRollback?) from IndexBuildAborted to facilitate the decision making in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cadb990e1ac4229bcf419f47c82656b6458faf8a/src/mongo/db/index_builds_coordinator.cpp#L2358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexBuildsCoordinator::_cleanUpTwoPhaseAfterFailure()&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1215254">SERVER-46560</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1496130">SERVER-51238</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1478458">SERVER-51008</issuekey>
        </issuelink>
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