Blocker Description
When the Master receives a RPC call from any other version than 0.19, it gets:
2009-01-17 22:04:00,266 WARN org.apache.hadoop.ipc.HBaseServer: Out of Memory in server select
java.lang.OutOfMemoryError: Java heap space
at org.apache.hadoop.hbase.ipc.HBaseRPC$Invocation.readFields(HBaseRPC.java:142)
at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:847)
at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:814)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:399)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.run(HBaseServer.java:308)
Easy to recreate by just starting a local 0.19 HBase and using the 0.18 shell to create a table.