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    <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-22107] Improve error message when ReplicaSetMonitor cannot connect to a replSet node in mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-22107</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When mongos cannot connect to any of the members of a shard replica set for extended periods of time (&amp;gt; 5 minutes), it will remove the ReplicaSetMonitor for that particular set in memory. The consequence is that it will start returning &quot;unknown replica set&quot; error instead of the usual cannot connect to host X.&lt;/p&gt;

&lt;p&gt;Original summary:&lt;br/&gt;
&apos;unknown replica set&apos; error message from mongos during failover&lt;br/&gt;
Original description:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;We had a user report that he got an error from mongos during a failover:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;This doesn&apos;t seem to be an error that should make its way back to the user. Is this possibly a bug in mongos?&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-ruby-driver/pull/739&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Here&lt;/a&gt; is the relevant report from the user.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="246335">SERVER-22107</key>
            <summary>Improve error message when ReplicaSetMonitor cannot connect to a replSet node in mongos</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="emily.stolfo">Emily Stolfo</reporter>
                        <labels>
                            <label>PM550</label>
                    </labels>
                <created>Fri, 8 Jan 2016 16:30:45 +0000</created>
                <updated>Tue, 6 Dec 2022 04:36:23 +0000</updated>
                            <resolved>Mon, 12 Dec 2016 20:14:11 +0000</resolved>
                                    <version>2.6.11</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1455601" author="schwerin" created="Mon, 12 Dec 2016 20:14:11 +0000"  >&lt;p&gt;As of 3.2.11 and 3.4.0, mongos no longer forgets about replica sets it&apos;s had trouble contacting, so the message should not longer appear.&lt;/p&gt;</comment>
                            <comment id="1134063" author="behackett" created="Wed, 13 Jan 2016 19:31:23 +0000"  >&lt;p&gt;I see. I misunderstood and thought you were saying it returned this error if it couldn&apos;t communicate with any individual seed. The problem is when it can&apos;t talk to the shard at all. In that case, I think the error message needs some work. The current message makes it sound like the replica set&apos;s setName changed or something.&lt;/p&gt;</comment>
                            <comment id="1134058" author="renctan" created="Wed, 13 Jan 2016 19:24:17 +0000"  >&lt;p&gt;I believe that is what is happening - mongos can&apos;t complete the request because it can&apos;t connect to the shard.&lt;/p&gt;</comment>
                            <comment id="1133817" author="behackett" created="Wed, 13 Jan 2016 17:02:52 +0000"  >&lt;p&gt;But why is that reported back to the client? This seems like something that should be logged by mongos. It should only cause a client side error if mongos can&apos;t complete the request.&lt;/p&gt;</comment>
                            <comment id="1133809" author="renctan" created="Wed, 13 Jan 2016 16:57:00 +0000"  >&lt;p&gt;Mongos can return this error message if it cannot connect to any node in the seed list (for mongos, the seed list is extracted from config.shards, which is updated whenever mongos detect membership changes). I propose that we change the message to something that gives more context.&lt;/p&gt;

&lt;p&gt;Note that mongos also &apos;forgets&apos; cache replica sets if it cannot contact any of it&apos;s members for 5 minutes. It can be repopulated again when it needs to talk to the replica set and at least one member in the seed list can be reached.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="273120">SERVER-23192</issuekey>
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