Hi Lars, I found the problem. Because I install the HBase using hbase 0.20.2, while in my client side I use HBase_trunk.
It seems a compatible problem. Jeff Zhang On Wed, Nov 11, 2009 at 6:23 PM, Lars George <[email protected]> wrote: > Hi Jeff, > > No, this message is always printed, i.e. "connection from and unkown user". > It's a bit worrying but nevertheless what you will always see. What is not > right of course is the NPE you get. I have never seen the client throwing an > exception at that point. The code does not reveal much, seems like the > "call" object is null - but why I do not know. > > Could you enable DEBUG level logging and try again? Maybe it is collateral > damage? > > Lars > > Jeff Zhang schrieb: > > Hi all, >> >> I meet a problem that I can not connect the HBase using Java API. >> >> The is my simple Java code: >> >> HBaseConfiguration conf=new HBaseConfiguration(); >> HBaseAdmin admin=new HBaseAdmin(conf); >> >> HTableDescriptor[] tables=admin.listTables(); >> for (HTableDescriptor table:tables){ >> System.out.println(Bytes.toString(table.getName())); >> } >> >> >> And I put the hbase-site in classpath. Here is the message: >> >> Exception in thread "IPC Client (47) connection to /10.148.224.11:60020from >> an unknown user" java.lang.NullPointerException >> at >> >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:518) >> at >> >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:448) >> >> >> But I debug the program and found the exception is happend at line 518 of >> file HBaseClient (the bold line): >> >> boolean isError = in.readBoolean(); // read if error >> if (isError) { >> call.setException(new RemoteException( >> WritableUtils.readString(in), >> WritableUtils.readString(in))); >> } else { >> Writable value = ReflectionUtils.newInstance(valueClass, conf); >> value.readFields(in); // read value >> * call.setValue(value);* >> } >> >> Is this a bug or does it need any extra configuration to tell the hbase >> cluster who is the client ? >> >> >> Jeff Zhang >> >> >> >
