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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-41037] Stepup should kill all user operations(that encounters prepare conflict)  before taking RSTL lock in X.</title>
                <link>https://jira.mongodb.org/browse/SERVER-41037</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently,&#160;there is a&#160;&#160;&lt;b&gt;3 way deadlock&lt;/b&gt;. Assume that we are transitioning from secondary to primary(signalDrainComplete).&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Thread A (Read thread) &#160;acquires RSTL lock in IX and &#160;blocked by a prepared txn due to prepare conflict.&lt;/li&gt;
	&lt;li&gt;Stepup enqueues RSTL lock in X mode. And blocked behind A.&lt;/li&gt;
	&lt;li&gt;Prepared txn won&#8217;t be able commit until we are able to change our state to primary.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;del&gt;Alternatively, thread A might have got blocked on prepare conflict due to conflicting DB/ collection lock. For eg. dbhash cmd.&lt;/del&gt;&#160;&lt;/p&gt;

&lt;p&gt;EDIT: Blocked due to conflicting mongoDB locks&#160; is not possible as secondary prepared txn yield&#160;mongoDB locks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="759654">SERVER-41037</key>
            <summary>Stepup should kill all user operations(that encounters prepare conflict)  before taking RSTL lock in X.</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="13201">Fixed</resolution>
                                        <assignee username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 May 2019 15:37:04 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:15 +0000</updated>
                            <resolved>Thu, 23 May 2019 18:36:02 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2258277" author="xgen-internal-githook" created="Thu, 23 May 2019 18:35:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;pvselvan@umich.edu&apos;, &apos;name&apos;: &apos;Pavi Vetriselvan&apos;, &apos;username&apos;: &apos;pvselvan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41037&quot; title=&quot;Stepup should kill all user operations(that encounters prepare conflict)  before taking RSTL lock in X.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41037&quot;&gt;&lt;del&gt;SERVER-41037&lt;/del&gt;&lt;/a&gt; kill all user operations that hit prepare conflicts on step up&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9b8814b6e7130652eca6f8fdaa9ff215b07d2ebb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9b8814b6e7130652eca6f8fdaa9ff215b07d2ebb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2250810" author="judah.schvimer" created="Fri, 17 May 2019 18:04:25 +0000"  >&lt;p&gt;This should use the error code &lt;tt&gt;InterruptedDueToStepDown&lt;/tt&gt; which &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41216&quot; title=&quot;Rename InterruptedDueToStepDown error code to InterruptedDueToReplStateChange&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41216&quot;&gt;&lt;del&gt;SERVER-41216&lt;/del&gt;&lt;/a&gt; will change to &lt;tt&gt;InterruptedDueToReplStateChange&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="2243584" author="suganthi.mani" created="Sun, 12 May 2019 05:02:57 +0000"  >&lt;p&gt;Quick note on the implementation,&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f80f6d084645dacff9572e7b1260492734a7e6b7/src/mongo/db/repl/replication_coordinator_impl.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_killUserOperationsOnStepDown&lt;/a&gt;&#160; should be called in a loop until RSTL lock is acquired in X mode by step up (like step down). Else, we might miss marking the operation killed that might end up in prepare conflict.&lt;/p&gt;</comment>
                            <comment id="2238801" author="judah.schvimer" created="Wed, 8 May 2019 17:27:53 +0000"  >&lt;p&gt;Making it depends on makes sense!&lt;/p&gt;</comment>
                            <comment id="2237775" author="suganthi.mani" created="Tue, 7 May 2019 20:48:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, yes,&#160; similar to&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40700&quot; title=&quot;Deadlock between read prepare conflicts and state transitions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40700&quot;&gt;&lt;del&gt;SERVER-40700&lt;/del&gt;&lt;/a&gt;((i.e) we should call the function &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f80f6d084645dacff9572e7b1260492734a7e6b7/src/mongo/db/repl/replication_coordinator_impl.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReplicationCoordinatorImpl::_killUserOperationsOnStepDown&lt;/a&gt;). Since, on secondaries, there cannot be any write,&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f80f6d084645dacff9572e7b1260492734a7e6b7/src/mongo/db/repl/replication_coordinator_impl.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_killUserOperationsOnStepDown&lt;/a&gt;&#160;will effectively kill operations that blocked by prepare conflict.&#160;&lt;/p&gt;

&lt;p&gt;This means we can mark this ticket as depended on&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40700&quot; title=&quot;Deadlock between read prepare conflicts and state transitions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40700&quot;&gt;&lt;del&gt;SERVER-40700&lt;/del&gt;&lt;/a&gt;. What do you say?&lt;/p&gt;

&lt;p&gt;P.S:&#160;Rollback(&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41035&quot; title=&quot;Rollback should kill all user operations before taking RSTL lock in X.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41035&quot;&gt;&lt;del&gt;SERVER-41035&lt;/del&gt;&lt;/a&gt;&#160;) can kill all user operations as we close the connection during rollback.&lt;/p&gt;</comment>
                            <comment id="2237718" author="judah.schvimer" created="Tue, 7 May 2019 20:21:44 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=suganthi.mani&quot; class=&quot;user-hover&quot; rel=&quot;suganthi.mani&quot;&gt;suganthi.mani&lt;/a&gt;, can you please clarify, is this only killing user operations that actually get a prepare conflict? Similar to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40700&quot; title=&quot;Deadlock between read prepare conflicts and state transitions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40700&quot;&gt;&lt;del&gt;SERVER-40700&lt;/del&gt;&lt;/a&gt; but on stepup, and there cannot be any writes because the node was a secondary?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="617120">SERVER-37574</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="740577">SERVER-40700</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="759612">SERVER-41035</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="770970">SERVER-41216</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="630322">SERVER-37988</issuekey>
        </issuelink>
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