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From Ryan Rawson <ryano...@gmail.com>
Subject Re: ANN: hbase 0.20.0 Release Candidate 1 available for download
Date Fri, 31 Jul 2009 22:03:32 GMT
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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