Hi Hadoop Users, I have one question, didn't get information on internet.
Why hadoop needs journaling system. In order to sync Active / Standby NN, instead of using Journal node or any shared system, can't it do master-slave or multi master replication where for any write master will write to other master/slave as well and only once replication is done at other sites will commit / accept the write ? One reason I could think is journal node writes data from NN in append only mode which *might* make it faster as compared to writing to slave / another master for replication but I am not sure. Any pointers ? Thanks, Amit Kabra.
