Hi all,

When i test the QJM Namenode HA, I check the log and find there are some state 
change,
such as :
hadoop.hdfs.StateChange: STATE* Replication Queue initialization scan for 
invalid, over- and under-replicated blocks completed 

hadoop.hdfs.StateChange: BLOCK* fsync: 

.hadoop.hdfs.StateChange: DIR* completeFile: /hbase/testnn/


So I want to know the detail of the state change of how the failover works! 

Can any one tell me if there is some design or workflow? or just look into the 
source code ?

Best wishes!

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