On Fri, Jun 15, 2012 at 10:50 AM, Em <[email protected]> wrote: > what are your experience with having more than one HBase-instance per > machine? >
My experience is ittle. Its been done though by others on this list. > One reason to do this could be that you got i.e. 32 GB RAM and want to > give 12-14 GB of RAM to each HBase instance so that you got little > issues with Garbage Collection while using the available RAM-capacity > for caching. > You should leave some RAM for the file system cache. Are you unable to tame your GCs? Is that why the two servers per node? > One thing I worry about is replication of data. Say two of three > replicas reside at the same box in two distinct HBase instances. So, you intend doubling the datanode instances per machine too? St.Ack
