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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: ANN: hbase 0.20.0 Release Candidate 1 available for download
Date Fri, 31 Jul 2009 22:11:31 GMT
Andrew is right that a RS is supposed to restart but it's not always
working. The real problem, as it is most of the time, is GC pauses
else there would be no ZK timeouts.

J-D

On Fri, Jul 31, 2009 at 6:05 PM, Andrew Purtell<apurtell@apache.org> wrote:
> Ok, then I vote +1 on the RC, but with the caveat that "restarting" should
> be stricken from HRS logging.
>
>   - Andy
>
>
>
>
> ________________________________
> From: Ryan Rawson <ryanobjc@gmail.com>
> To: hbase-dev@hadoop.apache.org
> Sent: Friday, July 31, 2009 3:03:32 PM
> Subject: Re: ANN: hbase 0.20.0 Release Candidate 1 available for download
>
> The JVM must terminate because it is difficult to reset the state of a
> HRS.  Thus supervision is necessary.
>
> On Fri, Jul 31, 2009 at 3:02 PM, Andrew Purtell<apurtell@apache.org> wrote:
>> My understanding is the region server is supposed to restart and check in
>> with the master as if newly launched. I could be wrong. I was away for a
>> while. At least following the log messages this appears to be the intent.
>>
>>   - Andy
>>
>>
>>
>>
>> ________________________________
>> From: Ryan Rawson <ryanobjc@gmail.com>
>> To: hbase-dev@hadoop.apache.org
>> Sent: Friday, July 31, 2009 2:11:36 PM
>> Subject: Re: ANN: hbase 0.20.0 Release Candidate 1 available for download
>>
>> It is not supposed to restart, you will need to use supervisor to
>> achieve that.
>>
>> If the ZK session is timed out, then the RS has no idea if the master
>> has reassigned regions or not.  The RS then FATALS, the master
>> recovers the log, and all will be well(ish).
>>
>> The zookeeper daemons also need supervising, since they might FATAL
>> but can be restarted to continue on later.
>>
>> On Fri, Jul 31, 2009 at 2:07 PM, Andrew Purtell<apurtell@apache.org> wrote:
>>> -1
>>>
>>> Region server did not restart after ZK timeout. Entered a high stress period
>>> while compacting under heavy write load, high RAM commitment, and
>>> concurrency.
>>>
>>> This is a stress test and I need to tune down vm.swappiness some more, but
>>> the region server shut down and did not restart.
>>>
>>> See attached.
>>>
>>>    - Andy
>>>
>>>
>>> ________________________________
>>> From: stack <stack@duboce.net>
>>> To: hbase-dev@hadoop.apache.org; hbase-user@hadoop.apache.org
>>> Sent: Wednesday, July 29, 2009 5:31:31 PM
>>> Subject: ANN: hbase 0.20.0 Release Candidate 1 available for download
>>>
>>> The first hbase 0.20.0 release candidate is available for download:
>>>
>>> http://people.apache.org/~stack/hbase-0.20.0-candidate-1/<http://people.apache.org/%7Estack/hbase-0.19.0-candidate-1/>
>>>
>>> More than 400 issues have been addressed.  The release notes are available
>>> here: http://su.pr/18zcEO <http://tinyurl.com/8xmyx9>.
>>>
>>> HBase 0.20.0 runs on Hadoop 0.20.0.  Alot has changed since 0.19.x including
>>> configuration fundamentals.  Be sure to read the 'Getting Started'
>>> documentation available here:
>>> http://su.pr/211OYP.<http://people.apache.org/%7Estack/hbase-0.19.0-candidate-1/>
>>>
>>> If you wish to bring your 0.19.x hbase data forward to 0.20.0, you will need
>>> to run a migration.  See http://wiki.apache.org/hadoop/Hbase/HowToMigrate.
>>> First read the overview and then go to the section, 'From 0.19.x to 0.20.x'.
>>>
>>> Should we release this candidate as hbase 0.20.0?  Please vote +1/-1 by
>>> Monday August 3rd.
>>>
>>> Yours,
>>> The HBasistas
>>>
>>> P.S. 0.20.0 Highlights include:
>>>
>>> + Much improved performance
>>> + Master is no longer SPOF
>>> + Rolling restarts -- no need to take down whole cluster updating config. or
>>> making minor upgrades
>>> + A new, more comprehensive API (The old API is still present but
>>> deprecated)
>>> + Improved mapreduce connectors
>>> + New contrib package with updated Transactional HBase (THBase) and Indexed
>>> HBase (ITHBase) as well as a new REST gateway called stargate
>>> + And, as they say on the radio, "much, much more".
>>>
>>>
>>
>>
>>
>>
>
>
>
>

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