hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Em <mailformailingli...@yahoo.de>
Subject Re: Multiple HBase instances per machine
Date Sat, 16 Jun 2012 08:53:41 GMT
Stack,

I have no issues with HBase, the question is purely theoretical.

> So, you intend doubling the datanode instances per machine too?
Everything else would not make sense to me, or what do you think?

Thanks for your feedback!

Regards,
Em

Am 16.06.2012 07:12, schrieb Stack:
> 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?
> 
> St.Ack
> 

Mime
View raw message