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<apurt...@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 <ryano...@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<apurt...@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 <st...@duboce.net> >> To: hbase-dev@hadoop.apache.org; hbase-u...@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". >> >> > > > >
