ClientProtocol version mismatch. (client = 42, server = 41) error after upgrading from 0.89 to 0.90

[Sadasivam, Srinivasan]

Getting exception after upgrading to 0.90. (from hbase-0.89.20100924) . Did I 
miss corresponding HDFS upgrade if any?
What currently I have DFS version: 0.20.2, r911707
Thanks.


2011-01-21 00:14:41,547 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled 
exception. Starting shutdown.
org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol 
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 42, 
server = 41)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:364)
        at 
org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:113)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:215)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:177)
        at 
org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:82)
        at 
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1378)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1390)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:196)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
        at 
org.apache.hadoop.hbase.master.MasterFileSystem.<init>(MasterFileSystem.java:87)
        at 
org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:341)
        at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:277)
2011-01-21 00:14:41,550 INFO org.apache.hadoop.hbase.master.HMaster: Aborting