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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-74385] Investigate if it is safe for DiskSpaceMonitor to abort builds during startup recovery or rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-74385</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should determine if it is safe first, and then if it is worth the effort. Can we get into a state where nodes are crashing or blocked from transitioning into steady state replication?&lt;/p&gt;

&lt;p&gt;If we end up enabling this, make sure to add tests.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2275734">SERVER-74385</key>
            <summary>Investigate if it is safe for DiskSpaceMonitor to abort builds during startup recovery or rollback</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="josef.ahmad@mongodb.com">Josef Ahmad</assignee>
                                    <reporter username="yujin.kang@mongodb.com">Yujin Kang Park</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Feb 2023 12:12:58 +0000</created>
                <updated>Mon, 20 Mar 2023 14:10:36 +0000</updated>
                            <resolved>Mon, 20 Mar 2023 14:10:36 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5284778" author="josef.ahmad" created="Mon, 20 Mar 2023 14:10:23 +0000"  >&lt;p&gt;Closing as Won&apos;t Do, as the current behaviour looks fine.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Startup recovery (from unclean shutdown) &lt;a href=&quot;https://github.com/10gen/mongo/blob/a9d058fe453c04352289e644c64150b588e46847/src/mongo/db/startup_recovery.cpp#L562-L565&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;restarts&lt;/a&gt; an incomplete index build.
	&lt;ul&gt;
		&lt;li&gt;The DiskSpaceMonitor starts after startup recovery completes. At that point, it is able to abort the in-progress build.&lt;/li&gt;
		&lt;li&gt;A corner case scenario probably exists where the server crashed&#160;&lt;em&gt;because&lt;/em&gt; it ran out of disk space, an index build contributing to it. On restart, the DiskSpaceMonitor must race again to cancel that index build. Even if it eventually managed to do it (potentially after multiple restarts) at that point, the index build may have already committed in the replica set. In summary, it would be the administrator&apos;s responsibility to increase disk size at that point.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Replication rollback&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/a9d058fe453c04352289e644c64150b588e46847/src/mongo/db/repl/rollback_impl.cpp#L360-L361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kills the index build&lt;/a&gt;. Quoting&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/a9d058fe453c04352289e644c64150b588e46847/src/mongo/db/index_builds_coordinator.h#L355-L358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;: &quot;&lt;em&gt;Called during rollback to stop all active index builds. &lt;span class=&quot;error&quot;&gt;&amp;#91;...&amp;#93;&lt;/span&gt; no abortIndexBuild is replicated and the current node will restart these builds at the completion of rollback. &lt;span class=&quot;error&quot;&gt;&amp;#91;...&amp;#93;&lt;/span&gt;&quot;.&lt;/em&gt; At that point, the DiskSpaceMonitor comes into play.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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