Hi there,
I'm having problems accessing HBase from within a MapReduce programme on
my cluster. To locate the problem I've written a very simple test
programme. It runs fine on the master node, however on the other nodes I
get the same error that was causing problems in the MapReduce programme:
java.io.IOException:
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@2937d090
closed
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:794)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:782)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:251)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:215)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:173)
at TestHBase.main(TestHBase.java:29)
This occurs after these lines in the programme:
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.master", args[0]);
HTable table = new HTable(conf, "Table1");
Note: I'm note accessing HBase through the InputFormat. I simply would
like to read out a few values in the setup-method of my mappers. hbase
shell seems to be working on all nodes just fine and I can ping and
telnet the master node on port 60000 from the other nodes.
What could be the problem? Am i missing something? I've installed HBase
with cloudera manager CDH4.
Kind regards,
Antony
