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<item>
            <title>[SERVER-3446] Seeing lots of &quot;transport error&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-3446</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I see a lot of &quot;transport errors&quot; like the ones below in my application, and I can&apos;t figure out why. I&apos;ve had to guard every call to mongo in my application with a lot of error handling logic just to avoid keeling over every time it throws a OperationFailure.&lt;/p&gt;

&lt;p&gt;Here&apos;s a grep for &quot;transport error&quot; from a mongos.log, all these happened yesterday (there&apos;s tons more in the logs for previous days):&lt;/p&gt;

&lt;p&gt;Mon Jul 18 08:55:40 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb05:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 16:25:27 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn659&amp;#93;&lt;/span&gt; warning: Could not get last error.DBClientBase::findOne: transport error: rfmcolldb06:27117 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 16:25:27 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb06:27117 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 16:25:27 &lt;span class=&quot;error&quot;&gt;&amp;#91;Balancer&amp;#93;&lt;/span&gt; caught exception while doing balance: DBClientBase::findOne: transport error: rfmcolldb06:27117 query: &lt;/p&gt;
{ features: 1 }
&lt;p&gt;Mon Jul 18 16:25:27 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn664&amp;#93;&lt;/span&gt; warning: Could not get last error.DBClientBase::findOne: transport error: rfmcolldb06:27117 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 16:35:14 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb01:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 16:43:53 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb01:27117 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 16:43:53 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn685&amp;#93;&lt;/span&gt; warning: Could not get last error.DBClientBase::findOne: transport error: rfmcolldb01:27117 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 16:43:53 &lt;span class=&quot;error&quot;&gt;&amp;#91;Balancer&amp;#93;&lt;/span&gt; caught exception while doing balance: DBClientBase::findOne: transport error: rfmcolldb01:27117 query: &lt;/p&gt;
{ features: 1 }
&lt;p&gt;Mon Jul 18 17:08:48 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb04:27117 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 17:09:02 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb04:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 17:09:02 &lt;span class=&quot;error&quot;&gt;&amp;#91;Balancer&amp;#93;&lt;/span&gt; caught exception while doing balance: DBClientBase::findOne: transport error: rfmcolldb04:27017 query: &lt;/p&gt;
{ features: 1 }
&lt;p&gt;Mon Jul 18 17:09:08 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb05:27117 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 17:15:08 ERROR: couldn&apos;t unset sharding : DBClientBase::findOne: transport error: rfmcolldb05:27117 query: &lt;/p&gt;
{ unsetSharding: 1 }
&lt;p&gt;Mon Jul 18 17:19:44 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb04:27017 query: { setShardVersion: &quot;fragments.pageview_fragments&quot;, configdb: &quot;rfmcolldb01:28100,rfmcolldb0&lt;br/&gt;
Mon Jul 18 17:20:17 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb05:27117 query: { setShardVersion: &quot;complete.exposures&quot;, configdb: &quot;rfmcolldb01:28100,rfmcolldb02:28100,rf&lt;br/&gt;
Mon Jul 18 17:20:56 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb05:27117 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 18:20:05 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb04:27017 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 22:10:17 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb03:27117 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 22:10:30 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 22:10:30 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn1374&amp;#93;&lt;/span&gt; warning: Could not get last error.DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ getlasterror: 1 }
&lt;p&gt;Mon Jul 18 22:10:31 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 22:10:31 ERROR: couldn&apos;t unset sharding : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ unsetSharding: 1 }
&lt;p&gt;Mon Jul 18 22:10:31 ERROR: couldn&apos;t unset sharding : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ unsetSharding: 1 }
&lt;p&gt;Mon Jul 18 22:10:31 ERROR: couldn&apos;t unset sharding : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ unsetSharding: 1 }
&lt;p&gt;Mon Jul 18 22:10:31 ERROR: couldn&apos;t unset sharding : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ unsetSharding: 1 }
&lt;p&gt;Mon Jul 18 22:10:33 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; WriteBackListener exception : DBClientBase::findOne: transport error: rfmcolldb03:27017 query: &lt;/p&gt;
{ writebacklisten: ObjectId(&apos;4e16ba0635330bc016259dc4&apos;) }
&lt;p&gt;Mon Jul 18 22:10:43 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb02:27017 query: { setShardVersion: &quot;fragments.exposure_fragments&quot;, configdb: &quot;rfmcolldb01:28100,rfmcolldb0&lt;br/&gt;
Mon Jul 18 22:10:43 &lt;span class=&quot;error&quot;&gt;&amp;#91;WriteBackListener&amp;#93;&lt;/span&gt; ERROR: error processing writeback: 10276 DBClientBase::findOne: transport error: rfmcolldb02:27017 query: { setShardVersion: &quot;fragments.exposure_fragments&quot;, configdb: &quot;rfmcolldb01:28100,rfmcolldb0&lt;/p&gt;</description>
                <environment>mongod 1.8.1, mongos 1.8.2-rc2. Six server cluster with four shards, 68 gig RAM EC2 instances. JRuby with latest mongo gem. </environment>
        <key id="19729">SERVER-3446</key>
            <summary>Seeing lots of &quot;transport error&quot;</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="iconara">Theo Hultberg</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Jul 2011 05:44:38 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:58 +0000</updated>
                            <resolved>Fri, 2 Sep 2011 05:11:17 +0000</resolved>
                                    <version>1.8.1</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="52139" author="eliot" created="Fri, 2 Sep 2011 05:11:17 +0000"  >&lt;p&gt;We&apos;ve lowered the keep alive time in 2.0&lt;/p&gt;</comment>
                            <comment id="44818" author="kbanker" created="Wed, 27 Jul 2011 15:12:15 +0000"  >&lt;p&gt;I&apos;ve seen this issue on EC2 when the tcp_keepalive_time is too low. 300 is a good setting, but sometimes it&apos;s 7200 by default.&lt;/p&gt;

&lt;p&gt;sysctl net.ipv4.tcp_keepalive_time=300 &lt;/p&gt;

&lt;p&gt;Edit /etc/sysctl.conf to make this permanent.&lt;/p&gt;</comment>
                            <comment id="43483" author="iconara" created="Wed, 20 Jul 2011 08:47:22 +0000"  >&lt;p&gt;Yes, it looks like they correspond to times when the mongo logs complain about network connectivity errors.&lt;/p&gt;</comment>
                            <comment id="42999" author="eliot" created="Tue, 19 Jul 2011 05:54:34 +0000"  >&lt;p&gt;That usually indicates either a server down or network trouble.&lt;br/&gt;
Can you check for those?&lt;/p&gt;</comment>
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