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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: Again UnknowScannerException
Date Wed, 10 Dec 2008 02:11:17 GMT
To change hbase.regionserver.lease.period, Should I restart hbase cluster?

On Sat, Nov 22, 2008 at 1:33 AM, Jean-Daniel Cryans <jdcryans@apache.org> wrote:
> David,
>
> You should indeed increase your hbase.regionserver.lease.period to at least
> 2 minutes.
>
> J-D
>
> On Fri, Nov 21, 2008 at 4:55 AM, David Alves <dalves@student.dei.uc.pt>wrote:
>
>> Hi
>>
>>        I've seen this issue a lot in the mailing list, but I still have a
>> doubt.
>>        My map tasks keep failing with unknownscannerexception (2 map tasks
>> on same node over a 3 node cluster with 4Gb mem, scanning almost 40 GBs of
>> data, running hadoop 0.18.0, and hbase 0.18.0), this happened in the past,
>> but as it passed 50% of the times rarely a M/R task completely failed, as
>> the data increased the USE now completely prevents the maps from running to
>> completion. I'm only scanning the table, there are no inserts at the same
>> time.
>>        I've previouly seen mentioned a lease period I could increase. Is
>> this the "hbase.regionserver.lease.period" property? Should I upgrade to
>> hbase 0.18.1, and if so must I also update hadoop?
>>
>> Regards
>> David Alves
>>
>>
>>
>



-- 
Best Regards, Edward J. Yoon @ NHN, corp.
edwardyoon@apache.org
http://blog.udanax.org

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