I noticed two lines for the same region server on HBase Master page: X.com:60030 1268160765854 requests=0, regions=16, usedHeap=1068, maxHeap=6127 X.com:60030 1268250726442 requests=21, regions=9, usedHeap=1258, maxHeap=6127
I checked there is only one org.apache.hadoop.hbase.regionserver.HRegionServer instance running on that machine. This is from region server log: 2010-03-10 13:25:38,157 ERROR [IPC Server handler 43 on 60020] regionserver.HRegionServer(844): org.apache.hadoop.hbase.NotServingRegionException: ruletable,,1268083966723 at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2307) at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1784) at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:648) at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915) 2010-03-10 13:25:38,189 ERROR [IPC Server handler 0 on 60020] regionserver.HRegionServer(844): org.apache.hadoop.hbase.NotServingRegionException: ruletable,,1268083966723 at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2307) at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1784) at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:648) at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915) If you know how to troubleshoot, please share.