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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-53431] Server should respond running operations with appropriate topologyVersion on stepdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-53431</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. We kill operations as part of the beginning of stepdown. Calling &lt;a href=&quot;https://github.com/mongodb/mongo/blob/78026dc407a66a7f4a642c6c6962f0dbd03f2dab/src/mongo/db/repl/replication_coordinator_impl.cpp#L2549&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetRstlForStepUpStepDown&lt;/a&gt; starts the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/78026dc407a66a7f4a642c6c6962f0dbd03f2dab/src/mongo/db/repl/replication_coordinator_impl.cpp#L2422&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;killOp thread&lt;/a&gt;&lt;br/&gt;
 2. We start to kill user operations before we disabling writes on primary and before transitioning the server to SECONDARY (these are the things that update the server description and trigger a topologyVersion bump)&lt;br/&gt;
 3. The killed operation error response is appended with a topologyVersion that hasn&apos;t been incremented yet.&lt;/p&gt;

&lt;p&gt;Since the topologyVersion is not incremented, the driver will try to reselect the same server to run the command even though it may still be in the process of stepping down.&lt;/p&gt;

&lt;p&gt;We can consider adding an extra incrementation to the topologyVersion before scheduling the killOps (we already increment the topologyVersion twice as part of stepdown &#8211; once for when we disable writes, and another when we complete the transition to secondary). Another alternative is to delaying the killOps logic until the topologyVersion is properly incremented.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1571601">SERVER-53431</key>
            <summary>Server should respond running operations with appropriate topologyVersion on stepdown</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Dec 2020 23:38:05 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:25 +0000</updated>
                            <resolved>Tue, 26 Jan 2021 16:10:58 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                    <fixVersion>4.2.16</fixVersion>
                                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="3952173" author="xgen-internal-githook" created="Tue, 20 Jul 2021 14:28:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53431&quot; title=&quot;Server should respond running operations with appropriate topologyVersion on stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53431&quot;&gt;&lt;del&gt;SERVER-53431&lt;/del&gt;&lt;/a&gt; Server should report itself not writable during stepdown&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d73b402b349498d799d4d4458cff9b0c4cea5fb6)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/28efeba497f86e7d6c32cba7adeaf9ca04e14704&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/28efeba497f86e7d6c32cba7adeaf9ca04e14704&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3620348" author="xgen-internal-githook" created="Wed, 17 Feb 2021 21:51:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53431&quot; title=&quot;Server should respond running operations with appropriate topologyVersion on stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53431&quot;&gt;&lt;del&gt;SERVER-53431&lt;/del&gt;&lt;/a&gt; Server should respond running operations with appropriate topologyVersion on stepdown&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a83036b85dd4b120663a560109f623534fa240ca)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d73b402b349498d799d4d4458cff9b0c4cea5fb6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d73b402b349498d799d4d4458cff9b0c4cea5fb6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3582856" author="matthew.russotto" created="Tue, 26 Jan 2021 16:13:53 +0000"  >&lt;p&gt;Fixed by moving the first increment of the counter to before we enqueue the RSTL lock instead of (not in addition to) after.  While we are waiting for the lock to be enqueued, we will report that we are not a writable primary.  If stepdown fails, we will increment the counter again to report that we are writable. &lt;/p&gt;</comment>
                            <comment id="3581965" author="xgen-internal-githook" created="Tue, 26 Jan 2021 01:45:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53431&quot; title=&quot;Server should respond running operations with appropriate topologyVersion on stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53431&quot;&gt;&lt;del&gt;SERVER-53431&lt;/del&gt;&lt;/a&gt; Server should respond running operations with appropriate topologyVersion on stepdown&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a83036b85dd4b120663a560109f623534fa240ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a83036b85dd4b120663a560109f623534fa240ca&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3571826" author="matthew.russotto" created="Tue, 19 Jan 2021 18:31:13 +0000"  >&lt;p&gt;After looking at the code, I recall the issue: we can&apos;t disable writes until we take the RSTL.  We can&apos;t take the RSTL until we kill the operations.  So we kill operations in a loop until we get the RSTL.  If we increment the topology version first, we&apos;ll still get a window in which we can start a new operation and have it killed with the same topology version.  Unless we increment the version once per loop.  Since it&apos;s a 64-bit counter, that actually seems reasonable.&lt;/p&gt;</comment>
                            <comment id="3571767" author="matthew.russotto" created="Tue, 19 Jan 2021 18:12:36 +0000"  >&lt;p&gt;It seems wrong that we kill operations before disabling writes, but there was a lot of complexity around this and it may be unavoidable. &lt;/p&gt;</comment>
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