Dear all, I have a simple HBase MapReduce application and try to run it on a 12-node cluster using this command:
HADOOP_CLASSPATH=`bin/hbase classpath` ~/hadoop-1.1.2/bin/hadoop jar xxxx.jar org.test.WordCount HBase version is 0.95.0. But i got this error: java.lang.RuntimeException: org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find region for wordcount,,99999999999999 after 10 tries. after a long waiting from this output: 14/01/24 10:12:51 INFO mapred.JobClient: map 0% reduce 0% It seems like RegionServer problem, however, i have tried all the ways to make sure the HBase cluster is running well: i can access all region servers through web ui, i can see the table 'wordcount' there, i run 'hbase hbck' and it returns all 'ok'. I even try a simple HBase program without MapReduce, it works well too. So, Could anybody tell me why this happens? how to fix it? Is it relevant to my Hadoop configuration? Thanks! - Dong Dai
