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On a cluster running MapReduce v1 (MRv1), a TaskTracker heartbeats into the JobTracker on your cluster, and alerts the JobTracker it has an open map task slot. What determines how the JobTracker assigns each map task to a TaskTracker?
A. The amount of RAM installed on the TaskTracker node.
B. The amount of free disk space on the TaskTracker node.
C. The number and speed of CPU cores on the TaskTracker node.
D. The average system load on the TaskTracker node over the past fifteen (15) minutes.
E. The location of the InsputSplit to be processed in relation to the location of the node.
Correct Answer: E
The TaskTrackers send out heartbeat messages to the JobTracker, usually every few minutes, to reassure the JobTracker that it is still alive. These message also inform the JobTracker of the number of available slots, so the JobTracker can stay up to date with where in the cluster work can be delegated. When the JobTracker tries to find somewhere to schedule a task within the MapReduce operations, it first looks for an empty slot on the same server that hosts the DataNode containing the data, and if not, it looks for an empty slot on a machine in the same rack.
Reference: 24 Interview Questions and Answers for Hadoop MapReduce developers, How JobTracker schedules a task?
In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?
A. It returns a reference to a different Writable object time.
B. It returns a reference to a Writable object from an object pool.
C. It returns a reference to the same Writable object each time, but populated with different data.
D. It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
E. It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.
Correct Answer: C
Calling Iterator.next() will always return the SAME EXACT instance of IntWritable, with the contents of that instance replaced with the next value.
Reference: manupulating iterator in mapreduce
What is a SequenceFile?
A. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
B. A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
C. A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
D. A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.
Correct Answer: D
SequenceFile is a flat file consisting of binary key/value pairs.
There are 3 different SequenceFile formats:
Uncompressed key/value records.
Record compressed key/value records - only 'values' are compressed here.
Block compressed key/value records - both keys and values are collected in 'blocks' separately and compressed. The size of the 'block' is configurable.
Reference: http://wiki.apache.org/hadoop/SequenceFile
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