Suppose you have a 7-node cluster with replication factor of 3. Describe what MapReduce has to do after it determines that a node has crashed while a job is being processed. For simplicity, assume that the failed node is not replaced and your cluster is reduced to 6 nodes. Specifically:

i)What does HDFS (the storage layer) have to do in response to node failure in this case?

ii)What does MapReduce engine have to do to respond to the node failure? Assume thatthere was a job in progress because otherwise MapReduce does not need to do anything.b)Where does the Mapper store output key-value pairs before they are sent to Reducers?

iii)Can Reducers begin processing before Mapper phase is complete? Why or why not?