Hi,

I'm facing a small issue, most probably configuration related, that
I'm not able to solve.

I'm trying to run the rowcounter.

Here is the command line:
export HADOOP_HOME=/home/hadoop/hadoop-1.0.3/; export
HBASE_HOME=/home/hbase/hbase-0.94.0/;
HADOOP_CLASSPATH=`${HBASE_HOME}/bin/hbase classpath`
${HADOOP_HOME}/bin/hadoop jar ${HBASE_HOME}/hbase-0.94.0.jar
rowcounter work_proposed -Dhbase.client.scanner.cachi=10

I'm getting errors for each of my regions:
12/10/11 09:10:45 ERROR mapreduce.TableInputFormatBase: Cannot resolve
the host name for /192.168.23.9 because of
javax.naming.NameNotFoundException: DNS name not found [response code
3]; remaining name '9.23.168.192.in-addr.arpa'

I have 25 regions for this table, so I have 25 lines like that.

And then it's blocking at:
12/10/11 09:10:45 INFO mapred.JobClient: Running job: job_201209151131_0005
12/10/11 09:10:46 INFO mapred.JobClient:  map 0% reduce 0%

Here is an extract of my host file:
192.168.23.9    node5
192.168.23.8    node4
192.168.23.7    node3
192.168.23.6    node2
192.168.23.5    node1

Hadoop is working fine.
HBase is working fine.

If I try the shell and do a count, it's working fine.

If I try with bin/hbase org.apache.hadoop.hbase.mapreduce.RowCounter
work_proposed it's working fine, but it's doing the regions one by
one, and not in parallel. So it's very slow.

I can ping the nodes, by name or IPs, I can ssh them too.

Any idea where I can start to look at?

Thanks,

JM

On Thu, Oct 11, 2012 at 6:17 AM, Jean-Marc Spaggiari
<[EMAIL PROTECTED]> wrote:
> Any idea where I can start to look at?
>

Sounds like DNS -- forward and reverse lookups -- work on the machine
you are launching your job from but not out on your cluster.  Check
DNS on the cluster members?
St.Ack

Hi St.Ack,

Thanks for your reply.

Finally, seems that this is not blocking the application. It's stated
as "ERROR"s but it's still running after that. After some time, I'm
getting some results.

I don't have any DNS on my cluster. All servers have the same host
file and static IPs. Is it mandatory to have a DNS to run HBase? Or
can it run without?

JM

2012/10/11, Stack <[EMAIL PROTECTED]>:
> On Thu, Oct 11, 2012 at 6:17 AM, Jean-Marc Spaggiari
> <[EMAIL PROTECTED]> wrote:
>> Any idea where I can start to look at?
>>
>
> Sounds like DNS -- forward and reverse lookups -- work on the machine
> you are launching your job from but not out on your cluster.  Check
> DNS on the cluster members?
> St.Ack
>