On Sat, Oct 9, 2010 at 1:15 PM, Abhijit Pol <[email protected]> wrote: > We are testing with 4 nodes HBase cluster out of which 3 machines are > identical with 64GB RAM and 6x1TB disks. and 4th machine has only 16GB RAM > and 2x1TB disks > > We observe (from server side metrics) frequent latency spikes and RS suicide > ~ every 8hrs from our 4th machine. >
How much heap have you given your servers? You could up your zk timeout of play with GC tunings -- if full GC the reason RSs are committing hari-kari. > We do have overall heap size configured based on total RAM available but all > other configs are same across RSs > > Is there a way to hint master to distribute regions based on > available resources? > No. Not currently. > We are using 0.89.20100924 branch. We have flop at default 0.3 and roughly > equal number of regions across all RSs. > > I'd suggest taking the odd-man-out out of your cluster or repurposing it as a master node. Usually clusters are homogeneous and much of the software assumes each node equivalent. We've not had a chance to work on clusters made of differently spec'd machines. St.Ack
