I use proto3 to log user event and then run a mapreduce to stat same 
metrics. But it reports an error:

Exception in thread "Thread-2" java.lang.NoSuchMethodError: 
at java.util.HashMap.hash(HashMap.java:338)
at java.util.HashMap.put(HashMap.java:611)

The problem is proto3 doesn't keep backward compatibility with proto2. 
hashLong is no longer exists in generated code with proto3. Now I faced a 
deed situation that neither proto2 nor proto3 can be loaded when i run a 
 mapreduce job.

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