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From Stack <st...@duboce.net>
Subject Re: Multiple HBase instances per machine
Date Sat, 16 Jun 2012 05:12:43 GMT
On Fri, Jun 15, 2012 at 10:50 AM, Em <mailformailinglists@yahoo.de> 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?


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