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From Josef Roehrl - PHEMI <jroe...@phemi.com>
Subject Re: Quick question re UnknownHostException
Date Mon, 16 Nov 2015 19:20:10 GMT
Never expect the unexpected :8)

On 15-11-13 08:44 AM, Josh Elser wrote:
> :) 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>

>>>
>>

-- 
>
> Josef Roehrl
> Senior Software Developer
> *PHEMI Systems*
> 180-887 Great Northern Way
> Vancouver, BC V5T 4T5
> 604-336-1119 <tel:604-336-1119>
> Website <http://www.phemi.com/> Twitter 
> <https://twitter.com/PHEMISystems> Linkedin 
> <http://www.linkedin.com/company/3561810?trk=tyah&trkInfo=tarId%3A1403279580554%2Ctas%3Aphemi%20hea%2Cidx%3A1-1-1>

>

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