Re: Quick question re UnknownHostException

[Josh Elser]

:) 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
<jroe...@phemi.com <mailto:jroe...@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>