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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: Again UnknowScannerException
Date Fri, 12 Dec 2008 09:01:29 GMT
Hmm. I still have a lot of UnknowScannerException while testing.
hbase.regionserver.lease.period is a 5 minutes.

I would like to know the technical reason. Comment?

/Edward

On Wed, Dec 10, 2008 at 2:57 PM, Michael Stack <stack@duboce.net> wrote:
> Edward J. Yoon wrote:
>>
>> To change hbase.regionserver.lease.period, Should I restart hbase cluster?
>>
>
> Edward: Yes, unfortunately (should make it so you don't have to).
>
> David: Please upgrade to hbase 0.18.1 for other reasons than
> hbase.regionserver.lease.period
>
> (and hadoop 0.18.2).  You do not need to upgrade hadoop to run hbase 0.18.1
> (or viceversa).  If lease period is all you want to change (HBASE-821), you
> don't need to upgrade; just make the change in your configuration (as J-D
> says) and copy it around your cluster.
>
> St.Ack
>
>
>
>
>> 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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