|| at Jan 22, 2009 at 5:40 pm
Let there is an Hbase cluster of one master and several region server
If we restart (shutdown -r now) only the Hbase master host,
while the region servers are running , we have to restart the region
when the Hbase master is up, otherwise the Hbase won't be available.
IIRC, regionservers will shut themselves down because they can't talk to
Better would be just closing their regions and staying up meantime
retrying for a master.
Or, when Zookeeper is in the mix, just keep serving till someone else
assumes master role.
You should probably put your regionservers under a babysitting process
so they get restarted if they fail.
On fresh start, a regionserver will just hang out till a master appears
for it to join to.
If we restart one or few region server hosts (but not all of them),
still will be available (up to performance problems). Yes.
Thank you for your cooperation,
No need to thank us Michael (smile).