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From Josh Elser <josh.el...@gmail.com>
Subject Re: Quick question re UnknownHostException
Date Fri, 13 Nov 2015 16:44:39 GMT
:) never think to expect a DNS issue until you have a DNS issue

Josef Roehrl - PHEMI wrote:
> Hi Everyone,
>
> Turns out that it was a DNS server issue exactly.  Had to get this
> confirmed by the Data Centre, though.
>
> Thanks!
>
> On Fri, Nov 13, 2015 at 12:25 PM, Josef Roehrl - PHEMI
> <jroehrl@phemi.com <mailto:jroehrl@phemi.com>> wrote:
>
>     Hi All,
>
>     3 times in the past few weeks (twice on 1 system, once on another),
>     the master gets UnknownHostException (s), one by one, for each of
>     the tablet servers.  Then, it wants to stop them. Eventually, all
>     the tablet servers quit.
>
>     It goes like this for all the tablet servers:
>
>     12 08:14:01,0498	tserver:6	20	
>     ERROR
>     	
>
>     error sending update to tserver3:9997: org.apache.thrift.transport.TTransportException:
java.net.UnknownHostException
>
>     12 09:01:53,0352	master:1	2	
>     ERROR
>     	
>
>     org.apache.thrift.transport.TTransportException: java.net.UnknownHostException
>
>     12 16:35:50,0672	master:1	10	
>     ERROR
>     	
>
>     unable to get tablet server status tserver3:9997[250e6cd2c500012] org.apache.thrift.transport.TTransportException:
java.net.UnknownHostException
>
>
>
>     I've redacted the real host names, of course.
>
>     This could be a DNS problem, though the system was running fine for
>     days before this happened (same scenario on the 2 systems with
>     really quite different DNS servers).
>
>     If any one has a hint or seen something like this, I would
>     appreciate any pointers.
>
>     I have looked at the JIRA issues regarding DNS outages, but nothing
>     seems to fit this pattern.
>
>     Thanks
>
>     --
>>
>>     Josef Roehrl
>>     Senior Software Developer
>>     *PHEMI Systems*
>>     180-887 Great Northern Way
>>     Vancouver, BC V5T 4T5
>>     604-336-1119
>>     Website <http://www.phemi.com/> Twitter
>>     <https://twitter.com/PHEMISystems> Linkedin
>>     <http://www.linkedin.com/company/3561810?trk=tyah&amp;trkInfo=tarId%3A1403279580554%2Ctas%3Aphemi%20hea%2Cidx%3A1-1-1>
>
>
>
>
>
> --
>>
>> Josef Roehrl
>> Senior Software Developer
>> *PHEMI Systems*
>> 180-887 Great Northern Way
>> Vancouver, BC V5T 4T5
>> 604-336-1119
>> Website <http://www.phemi.com/> Twitter
>> <https://twitter.com/PHEMISystems> Linkedin
>> <http://www.linkedin.com/company/3561810?trk=tyah&amp;trkInfo=tarId%3A1403279580554%2Ctas%3Aphemi%20hea%2Cidx%3A1-1-1>
>

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