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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-20517] Queries failing when replica set secondary is down.</title>
                <link>https://jira.mongodb.org/browse/SERVER-20517</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a sharded cluster, with mongos on each of the app servers.  If I stop a secondary on the first shard, then from the replica set point of view, everything seems ok (primary still up).  However, our application servers are then unable to query the local mongos (the queries just time out).&lt;/p&gt;

&lt;p&gt;Looking at the mongos logs, there are errors like this:&lt;/p&gt;

&lt;p&gt;W NETWORK  &lt;span class=&quot;error&quot;&gt;&amp;#91;Balancer&amp;#93;&lt;/span&gt; Failed to connect to &amp;lt;IP of replica set SECONDARY&amp;gt;, reason: errno:111 Connection refused&lt;br/&gt;
W NETWORK  &lt;span class=&quot;error&quot;&gt;&amp;#91;ReplicaSetMonitorWatcher&amp;#93;&lt;/span&gt; Failed to connect to  &amp;lt;IP of replica set SECONDARY&amp;gt;, reason: errno:111 Connection refused&lt;/p&gt;</description>
                <environment>Debian7</environment>
        <key id="230646">SERVER-20517</key>
            <summary>Queries failing when replica set secondary is down.</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="bgsosh@gmail.com">Scott Lowe</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Sep 2015 10:12:38 +0000</created>
                <updated>Thu, 6 Apr 2023 16:24:29 +0000</updated>
                            <resolved>Wed, 23 Sep 2015 12:20:11 +0000</resolved>
                                    <version>3.0.5</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1040652" author="bgsosh@gmail.com" created="Wed, 23 Sep 2015 08:54:19 +0000"  >&lt;p&gt;Doh, someone had slipped a read preference in the app code.  It&apos;s working as expected now.&lt;/p&gt;

&lt;p&gt;Thank you for your support, and sorry for the false issue.&lt;/p&gt;</comment>
                            <comment id="1038952" author="samk" created="Mon, 21 Sep 2015 21:00:56 +0000"  >&lt;p&gt;Thanks for this report, and sorry that you&apos;re experiencing this issue. I have a few questions about your configuration and system: &lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;What read preference or preferences are your applications using?&lt;/li&gt;
	&lt;li&gt;Can you provide a copy of the output of &lt;tt&gt;sh.status()&lt;/tt&gt; while connected to the &lt;tt&gt;mongos&lt;/tt&gt; systems?&lt;/li&gt;
	&lt;li&gt;Do you see the same behavior while connected to all &lt;tt&gt;mongos&lt;/tt&gt; instances?&lt;/li&gt;
	&lt;li&gt;Do all app servers have identical workloads, or are some specialized for worker or reporting roles?&lt;/li&gt;
	&lt;li&gt;How do you resolve this issue? Does the issue go away after a period of time? Are you restarting your &lt;tt&gt;mongos&lt;/tt&gt; instances?&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Regards,&lt;br/&gt;
sam&lt;/p&gt;</comment>
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