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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-50735] Mongos 4.4.0 can return the topologyVersion of a shard in state change errors</title>
                <link>https://jira.mongodb.org/browse/SERVER-50735</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongos can return the wrong topologyVersion in state change error responses to the client. Instead of returning its own topologyVersion, mongos can return the topologyVersion of a shard member in some error responses.&lt;/p&gt;

&lt;p&gt;I&apos;ve attach a reproduction script using failCommand (&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/276904/276904_reproMongosWrongTopologyVersion.js&quot; title=&quot;reproMongosWrongTopologyVersion.js attached to SERVER-50735&quot;&gt;reproMongosWrongTopologyVersion.js&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;). It&apos;s also possible to trigger the same bug using a real shutdown or replSetStepDown event. To reproduce:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Start a cluster. Mine has 1 mongos and a 1 member shard.&lt;/li&gt;
	&lt;li&gt;Note the topologyVersion reported by the mongos.&lt;/li&gt;
	&lt;li&gt;Insert into test.test&lt;/li&gt;
	&lt;li&gt;Run an operation on mongos, my example uses findAndModify but I imagine other commands will also reproduce.&lt;/li&gt;
	&lt;li&gt;At the same time, cause the mongos-mongod operation to fail. This can be done with failCommand, shutdown:1, etc...&lt;/li&gt;
	&lt;li&gt;See the operation fails and mongos returns a error with the incorrect topologyVersion.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The attach repro script&apos;s output (notice the different topologyVersion fields both reported by mongos):&lt;/p&gt;
&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;mongos topologyVersion:  {&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;	&quot;processId&quot; : ObjectId(&quot;5f501dd34f1464b2cf98116a&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;	&quot;counter&quot; : NumberLong(0)&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;}&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;&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;...&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;&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;uncaught exception: Error: findAndModifyFailed failed: {&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;	&quot;topologyVersion&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;		&quot;processId&quot; : ObjectId(&quot;5f501dcf33e67a0de9b4ab21&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;		&quot;counter&quot; : NumberLong(8)&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;	},&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;	&quot;ok&quot; : 0,&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;	&quot;errmsg&quot; : &quot;Failing command due to &apos;failCommand&apos; failpoint&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;	&quot;code&quot; : 11602,&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;	&quot;codeName&quot; : &quot;InterruptedDueToReplStateChange&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;	&quot;operationTime&quot; : Timestamp(1599086037, 28),&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;	&quot;$clusterTime&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;		&quot;clusterTime&quot; : Timestamp(1599086037, 28),&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;		&quot;signature&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;			&quot;hash&quot; : BinData(0,&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAA=&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;			&quot;keyId&quot; : NumberLong(0)&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;		}&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;	}&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;} :&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;_getErrorWithCode@src/mongo/shell/utils.js:25:13&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;DBCollection.prototype.findAndModify@src/mongo/shell/collection.js:730:15&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;DBCollection.prototype.findOneAndReplace@src/mongo/shell/crud_api.js:833:12&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;@reproMongosWrongTopologyVersion.js:27:11&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;failed to load: reproMongosWrongTopologyVersion.js&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;exiting with code -3&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;p&gt;It&apos;s possible this could be fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50549&quot; title=&quot;Transform connection-related error codes in proxied commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50549&quot;&gt;&lt;del&gt;SERVER-50549&lt;/del&gt;&lt;/a&gt; but I wanted to call out this bug separately.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1461212">SERVER-50735</key>
            <summary>Mongos 4.4.0 can return the topologyVersion of a shard in state change errors</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="shane.harvey@mongodb.com">Shane Harvey</reporter>
                        <labels>
                            <label>sa-remove-fv-backlog-22</label>
                    </labels>
                <created>Wed, 2 Sep 2020 22:50:53 +0000</created>
                <updated>Tue, 6 Dec 2022 02:10:01 +0000</updated>
                                            <version>4.4.0</version>
                                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3607376" author="ratika.gandhi" created="Tue, 9 Feb 2021 18:14:03 +0000"  >&lt;p&gt;We will revisit the ticket after&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50549&quot; title=&quot;Transform connection-related error codes in proxied commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50549&quot;&gt;&lt;del&gt;SERVER-50549&lt;/del&gt;&lt;/a&gt;&#160;is complete.&#160;&lt;/p&gt;</comment>
                            <comment id="3405315" author="tess.avitabile" created="Tue, 22 Sep 2020 14:57:49 +0000"  >&lt;p&gt;I agree it&apos;s a problem for mongos to forward state change errors from shards to drivers. However, I don&apos;t think appending the mongos&apos;s topologyVersion is the right way to solve this problem. It&apos;s an important aspect of the streamable hello protocol that a node only attach its topologyVersion for state change errors that change its topologyVersion. If mongos attaches topologyVersion to shutdown errors in 4.4, for example, then drivers will incorrectly ignore those shutdown errors, even though the mongos is shutting down. I would rather solve &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50549&quot; title=&quot;Transform connection-related error codes in proxied commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50549&quot;&gt;&lt;del&gt;SERVER-50549&lt;/del&gt;&lt;/a&gt; in a different way, by distinguishing errors from the shard vs the mongos itself, rather than using topologyVersion to say that errors should be ignored.&lt;/p&gt;</comment>
                            <comment id="3405223" author="divjot.arora" created="Tue, 22 Sep 2020 14:30:05 +0000"  >&lt;p&gt;I have some concerns about mongos never returning topologyVersion for command errors. In drivers, an omitted topologyVersion means that the response is never considered stale, so it will be processed. Because the errors propagated from mongod&apos;s can be state change errors, this would cause drivers to mark the mongos Unknown due to a state change in one of the shards. This could potentially happen multiple times for the same state change if there are multiple concurrent operations running on the shard.&lt;/p&gt;

&lt;p&gt;This concern will probably be alleviated by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50549&quot; title=&quot;Transform connection-related error codes in proxied commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50549&quot;&gt;&lt;del&gt;SERVER-50549&lt;/del&gt;&lt;/a&gt;, but I wanted to bring it up here as well because I don&apos;t understand why it&apos;s incorrect for a mongos to always add its topologyVersion to responses. My understanding is that topologyVersion is a way to communicate how new/old a server is to drivers so they can decide if an error or heartbeat response requires processing. If the monogs were to always append its own version, drivers would never mark it Unknown for state changes in shards because the version wouldn&apos;t be considered newer than the one the driver is already aware of.&lt;/p&gt;</comment>
                            <comment id="3405213" author="tess.avitabile" created="Tue, 22 Sep 2020 14:27:34 +0000"  >&lt;p&gt;Thank you!&lt;/p&gt;</comment>
                            <comment id="3405203" author="pavithra.vetriselvan" created="Tue, 22 Sep 2020 14:23:40 +0000"  >&lt;p&gt;The changes should be relatively straightforward, so I can do it this sprint!&lt;/p&gt;</comment>
                            <comment id="3405184" author="tess.avitabile" created="Tue, 22 Sep 2020 14:17:02 +0000"  >&lt;p&gt;Cool, sounds good! I think we should fix the issue this sprint if we can. Would it work for you to implement the fix this sprint? If it would be tough to fit in with your project plans this sprint, I can ask someone else.&lt;/p&gt;</comment>
                            <comment id="3405137" author="pavithra.vetriselvan" created="Tue, 22 Sep 2020 14:00:41 +0000"  >&lt;p&gt;Ah, yes that makes sense to me. Good call, Tess! In that case, I think we would have to check &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0/src/mongo/s/commands/strategy.cpp#L346-L347&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0/src/mongo/s/commands/strategy.cpp#L1087&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; to see if the response contains a topologyVersion. If so, we remove it. This logic should probably be implemented in a helper function, perhaps called &lt;tt&gt;removeTopologyVersionFromResponse&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="3405108" author="tess.avitabile" created="Tue, 22 Sep 2020 13:47:16 +0000"  >&lt;p&gt;Thanks, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt;!&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt;, when the driver receives a topologyVersion as part of a command error, does it store that topologyVersion and use it in its next isMaster command to the mongos? If so, the next isMaster command to the mongos will return immediately, since the processId will be wrong. I don&apos;t think that&apos;s terribly harmful, but it&apos;s unexpected behavior.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;, I think that in 4.4, mongos should never return its own topologyVersion as part of a command error. A node should only return its topologyVersion as part of a command error if that error is associated with a change in that node&apos;s topologyVersion. Otherwise, the driver will incorrectly ignore the command error. Post-4.4, the mongos should only return its own topologyVersion when in quiesce mode. So I think that the mongos should strip out the topologyVersion of the mongod from the response, but it should not append its own. Do you know the right place for us to strip out the topologyVersion of the mongod?&lt;/p&gt;</comment>
                            <comment id="3404182" author="pavithra.vetriselvan" created="Mon, 21 Sep 2020 21:17:42 +0000"  >&lt;p&gt;Got it, thanks for the explanation Shane!&lt;/p&gt;</comment>
                            <comment id="3404155" author="shane.harvey" created="Mon, 21 Sep 2020 21:04:31 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;. I believe that the only impact of returning the wrong topologyVersion is that clients which get multiple errors at the same time may mark the server unknown and clear the connection pool multiple times. In other words, it negates some of the benefit of DRIVERS-1187. &lt;/p&gt;</comment>
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