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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>
    </build-info>


<item>
            <title>[SERVER-56004] Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig </title>
                <link>https://jira.mongodb.org/browse/SERVER-56004</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We see the following sequence occur when running &lt;tt&gt;rollback_set_fcv.js&lt;/tt&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;It first successfully runs a test which ends with the replica set in version 4.9.&lt;/li&gt;
	&lt;li&gt;Then, in the second test, the primary first sets the FCV of the entire replica set to 4.4. Since this is a downgrade from 4.9, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L413-L437&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we issue a reconfig, which waits to be propagated to a &lt;b&gt;majority&lt;/b&gt; of the nodes&lt;/a&gt;.&#160;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;We see a log message indicating that it has been propagated to a majority of nodes:
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:07.492+00:00 I  -        5042304 [conn2] &quot;The downgraded replica set config has been propagated to a majority&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;It also seems like from heartbeat requests, all nodes have actually updated to this new config of configVersion: 6, configTerm: 2.
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:06.003+00:00 D2 REPL_HB  24095   [conn20] &quot;Received heartbeat request&quot;,&quot;attr&quot;:{&quot;from&quot;:&quot;ip-10-122-51-241.ec2.internal:20772&quot;,&quot;cmdObj&quot;:{&quot;replSetHeartbeat&quot;:&quot;rollback_set_fcv&quot;,&quot;configVersion&quot;:6,&quot;configTerm&quot;:2,&quot;hbv&quot;:1,&quot;from&quot;:&quot;ip-10-122-51-241.ec2.internal:20772&quot;,&quot;fromId&quot;:2,&quot;term&quot;:2,&quot;primaryId&quot;:-1,&quot;maxTimeMSOpOnly&quot;:10000,&quot;$replData&quot;:1,&quot;$clusterTime&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;signature&quot;:{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;7OtpxE//rC4QyFMzAfGz+yomYA4=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:6937200231259832000}},&quot;$db&quot;:&quot;admin&quot;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:06.140+00:00 D2 REPL_HB  24095   [conn5] &quot;Received heartbeat request&quot;,&quot;attr&quot;:{&quot;from&quot;:&quot;ip-10-122-51-241.ec2.internal:20770&quot;,&quot;cmdObj&quot;:{&quot;replSetHeartbeat&quot;:&quot;rollback_set_fcv&quot;,&quot;configVersion&quot;:6,&quot;configTerm&quot;:2,&quot;hbv&quot;:1,&quot;from&quot;:&quot;ip-10-122-51-241.ec2.internal:20770&quot;,&quot;fromId&quot;:0,&quot;term&quot;:2,&quot;maxTimeMSOpOnly&quot;:10000,&quot;$replData&quot;:1,&quot;$db&quot;:&quot;admin&quot;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:07.492+00:00 I  REPL     4508701 [conn2] &quot;The current replica set config is committed&quot;,&quot;attr&quot;:{&quot;configVersion&quot;:6,&quot;configTerm&quot;:2,&quot;configWaitDurationMillis&quot;:2009,&quot;oplogWaitDurationMillis&quot;:0,&quot;configOplogCommitmentOpTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192804,&quot;i&quot;:1}},&quot;t&quot;:2}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;However, on the primary, we only receive heartbeat responses with the new config of configVersion: 6, configTerm: 2 from one of the secondaries:
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:05.658+00:00 D2 REPL_HB  4615620 [ReplCoord-6] &quot;Received response to heartbeat&quot;,&quot;attr&quot;:{&quot;requestId&quot;:125,&quot;target&quot;:&quot;ip-10-122-51-241.ec2.internal:20770&quot;,&quot;response&quot;:{&quot;ok&quot;:1,&quot;state&quot;:2,&quot;v&quot;:5,&quot;configTerm&quot;:2,&quot;set&quot;:&quot;rollback_set_fcv&quot;,&quot;syncingTo&quot;:&quot;ip-10-122-51-241.ec2.internal:20771&quot;,&quot;term&quot;:2,&quot;primaryId&quot;:1,&quot;durableOpTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;t&quot;:2},&quot;durableWallTime&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:05.459Z&quot;},&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;t&quot;:2},&quot;wallTime&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:05.459Z&quot;},&quot;electable&quot;:true,&quot;$replData&quot;:{&quot;term&quot;:2,&quot;lastOpCommitted&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;t&quot;:2},&quot;lastCommittedWall&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:05.459Z&quot;},&quot;lastOpVisible&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;t&quot;:2},&quot;configVersion&quot;:5,&quot;configTerm&quot;:2,&quot;replicaSetId&quot;:{&quot;$oid&quot;:&quot;6045e2dbfd9e9af77a0e716b&quot;},&quot;syncSourceIndex&quot;:1,&quot;isPrimary&quot;:false},&quot;$clusterTime&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;signature&quot;:{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAA=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:0}},&quot;operationTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:rollback_set_fcv] d20781| 2021-03-08T08:40:07.491+00:00 D2 REPL_HB  4615620 [ReplCoord-2] &quot;Received response to heartbeat&quot;,&quot;attr&quot;:{&quot;requestId&quot;:127,&quot;target&quot;:&quot;ip-10-122-51-241.ec2.internal:20772&quot;,&quot;response&quot;:{&quot;ok&quot;:1,&quot;state&quot;:2,&quot;v&quot;:6,&quot;configTerm&quot;:2,&quot;set&quot;:&quot;rollback_set_fcv&quot;,&quot;syncingTo&quot;:&quot;ip-10-122-51-241.ec2.internal:20771&quot;,&quot;term&quot;:2,&quot;primaryId&quot;:1,&quot;durableOpTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192801,&quot;i&quot;:2}},&quot;t&quot;:2},&quot;durableWallTime&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:01.459Z&quot;},&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192801,&quot;i&quot;:2}},&quot;t&quot;:2},&quot;wallTime&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:01.459Z&quot;},&quot;electable&quot;:false,&quot;$replData&quot;:{&quot;term&quot;:2,&quot;lastOpCommitted&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;t&quot;:2},&quot;lastCommittedWall&quot;:{&quot;$date&quot;:&quot;2021-03-08T08:40:05.459Z&quot;},&quot;lastOpVisible&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192801,&quot;i&quot;:2}},&quot;t&quot;:2},&quot;configVersion&quot;:6,&quot;configTerm&quot;:2,&quot;replicaSetId&quot;:{&quot;$oid&quot;:&quot;6045e2dbfd9e9af77a0e716b&quot;},&quot;syncSourceIndex&quot;:1,&quot;isPrimary&quot;:false},&quot;$clusterTime&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192805,&quot;i&quot;:1}},&quot;signature&quot;:{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAA=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:0}},&quot;operationTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1615192801,&quot;i&quot;:2}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;After this, the primary is network partitioned from the other nodes, and attempts to set its FCV to the target version of 4.9.&lt;/li&gt;
	&lt;li&gt;In order to do this, it must first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ce0ca59fe078248631d0de5bc82a46374865c3fa/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L110-L119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait for the current replica set config (configVersion: 6, configTerm: 2) to propagate to &lt;b&gt;all&lt;/b&gt; nodes&lt;/a&gt;. It seems like the primary never updated its local view of one of the secondaries (node with port 20770), so it still thinks it has an old config. Since the primary is partitioned, it is never able to update its view of the other nodes&apos; configs, which causes the hang in &lt;tt&gt;awaitReplication&lt;/tt&gt;, so it is never able to set its FCV to the target version of 4.9.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;One possible solution could be to make sure the initial downgrade reconfig is propagated to all of the nodes in the replica set, rather than just the majority. This way, the primary&apos;s view of the other nodes&apos; configs would be up to date before trying to set its FCV. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1676708">SERVER-56004</key>
            <summary>Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig </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="huayu.ouyang@mongodb.com">Huayu Ouyang</assignee>
                                    <reporter username="huayu.ouyang@mongodb.com">Huayu Ouyang</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Apr 2021 19:32:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:04 +0000</updated>
                            <resolved>Thu, 10 Jun 2021 20:56:19 +0000</resolved>
                                                    <fixVersion>5.0.0-rc2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4108241" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 19:01:09 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3871748" author="xgen-internal-githook" created="Thu, 10 Jun 2021 19:55:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Huayu Ouyang&apos;, &apos;email&apos;: &apos;huayu.ouyang@mongodb.com&apos;, &apos;username&apos;: &apos;huayu-ouyang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56004&quot; title=&quot;Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56004&quot;&gt;&lt;del&gt;SERVER-56004&lt;/del&gt;&lt;/a&gt; Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7f56da83d8ce91fa17bd5687a33747fe34e64cf8)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/24f30176f35df97b2d2ca569a946287ff4b2938f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/24f30176f35df97b2d2ca569a946287ff4b2938f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3871015" author="xgen-internal-githook" created="Thu, 10 Jun 2021 15:42:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Huayu Ouyang&apos;, &apos;email&apos;: &apos;huayu.ouyang@mongodb.com&apos;, &apos;username&apos;: &apos;huayu-ouyang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56004&quot; title=&quot;Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56004&quot;&gt;&lt;del&gt;SERVER-56004&lt;/del&gt;&lt;/a&gt; Fix rollback_set_fcv.js where primary hangs when setting FCV after reconfig&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f56da83d8ce91fa17bd5687a33747fe34e64cf8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f56da83d8ce91fa17bd5687a33747fe34e64cf8&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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