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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: does hbase master need to be a hadoop datanode as well?
Date Sat, 23 Feb 2013 22:38:09 GMT
"as long as machine is powerful"

That's the key ;)

If you run you standalone HBase in a virtual machine, it might not be
powerful enought and you might miss the heartbeats. Same if you run on a
computer without enought memory and it's starting to swap.

JM

2013/2/23 anil gupta <anilgupta84@gmail.com>

> On Feb 22, 2013 11:50 AM, "Jean-Marc Spaggiari" <jean-marc@spaggiari.org>
> wrote:
> >
> > Just to add to Mohammad's advices, you should avoid to run ZK on the same
> > servers as you are running HBase.
> >
> > Reason is, if you are running in long GCs, ZK might miss the heartbeats
> and
> > thinks servers are down. So safer to run same separately if you can.
> >
> Zk and HM run in seperate JVM; so how would running them on the same
> machine will cause ZK missing hearbeats?
> As far as I know as long as machine is powerful enough to handle the load
> of ZK and HM, then it should be fine. One thing to note is that Zk will
> work well if you have dedicated disk for it.
> > JM
> >
> > 2013/2/22 Mohammad Tariq <dontariq@gmail.com>
> >
> > > Hello Kaven,
> > >
> > >       It's not all necessary to run HM on server running DN. Actually
> it's
> > > not advisable to do so, as HM has high memory requirements and running
> > > other daemons on the same machine may lead you to problems. The basic
> > > cluster setup, which people normally use looks somewhat like this :
> > >
> > >   NN+JT(Hadoop master)
> > >   SNN
> > >   HM(Hbase master)
> > >   DN+TT+RS
> > >
> > >
> > > Warm Regards,
> > > Tariq
> > > https://mtariq.jux.com/
> > > cloudfront.blogspot.com
> > >
> > >
> > > On Sat, Feb 23, 2013 at 12:45 AM, kaveh minooie <kaveh@plutoz.com>
> wrote:
> > >
> > > > Hi everyone,
> > > >
> > > > I had a quick question. do I need to be running datanode on the
> server
> > > > that is running hbase master or datanode should be running only on
> > > servers
> > > > that are running as regionserver?
> > > >
> > > > thanks,
> > > > --
> > > > Kaveh Minooie
> > > >
> > >
>

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