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From Flavio Pompermaier <pomperma...@okkam.it>
Subject Re: HBase cluster design
Date Fri, 04 Apr 2014 14:29:58 GMT
Yes I know I should update HBase, this is something I'm going to do really
soon. Bad me..
I just wanted to know if the fact of adding/updating rows in HBase while
running a mapred job could be problematic or not..
>From what you told me it's not, so the problem could be caused by the old
version of HBase or some other os configuration.
The update was performed via an application accessing HBase directly,
adding and updating rows of the table.
Once in a while some region servers goes down and marked as "bad state" by
Cloudera so I have to restart them.

The error I usually see is:

2012-11-23 12:41:00,468 WARN org.apache.zookeeper.ClientCnxn: Session
0x13b2cf447fd0000 for server null, unexpected error, closing socket
connection and attempting reconnect
java.net.ConnectException: Connection refused
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
	at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:286)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1047


On Fri, Apr 4, 2014 at 2:35 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Was the updating performed by one of the mapreduce jobs ?
> HBase should be able to serve multiple mapreduce jobs in the same cluster.
> Can you provide more detail on the crash ?
> BTW, there are 3 major releases after 0.92
> Please consider upgrading your cluster to newer release.
> Cheers
> On Apr 4, 2014, at 3:08 AM, Flavio Pompermaier <pompermaier@okkam.it>
> wrote:
> > Hi to everybody,
> >
> > I have a probably stupid question: is it a problem to run many mapreduce
> > jobs on the same HBase table at the same time? And multiple jobs on
> > different tables on the same cluster?
> > Should I use Hoya to have a better cluster usage..?
> >
> > In my current cluster I noticed that the region servers tend to go down
> if
> > I run a mapreduce job while updating (maybe it could be related to the
> old
> > version of HBase I'm currently running: 0.92.1-cdh4.1.2).
> >
> > Best,
> > Flavio

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