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…

Question

Options

• AThe amount of RAM installed on the TaskTracker node.
• BThe amount of free disk space on the TaskTracker node.
• CThe number and speed of CPU cores on the TaskTracker node.
• DThe average system load on the TaskTracker node over the past fifteen (15) minutes.
• EThe location of the InsputSplit to be processed in relation to the location of the node.

• A
  9% (2)
• B
  5% (1)
• C
  5% (1)
• E
  82% (18)

Explanation

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

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