Explanation:A heartbeat is sent from the TaskTracker to the JobTracker every few minutes to check its status whether the node is dead or alive. 5. Point out the wrong statement :
A. The map function in Hadoop MapReduce have the following general form:map:(K1, V1) → list(K2, V2)
B. The reduce function in Hadoop MapReduce have the following general form: reduce: (K2, list(V2)) → list(K3, V3)
C. MapReduce has a complex model of data processing: inputs and outputs for the map and reduce functions are key-value pairs
D. None of the mentioned
Answer:A
Explanation:A heartbeat is sent from the TaskTracker to the JobTracker every few minutes to check its status whether the node is dead or alive. 5. Point out the wrong statement :
A. The map function in Hadoop MapReduce have the following general form:map:(K1, V1) → list(K2, V2) B. The reduce function in Hadoop MapReduce have the following general form: reduce: (K2, list(V2)) → list(K3, V3) C. MapReduce has a complex model of data processing: inputs and outputs for the map and reduce functions are key-value pairs D. None of the mentioned
Explanation:MapReduce is relatively simple model to implement in Hadoop. 6. InputFormat class calls the ________ function and computes splits for each file and then sends them to the jobtracker.