CCA-500 · Question #68
Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?
The correct answer is D. Tasktracker. A TaskTracker is a slave node daemon in the cluster that accepts tasks (Map, Reduce and Shuffle operations) from a JobTracker. There is only One Task Tracker process run on any hadoop slave node. Task Tracker runs on its own JVM process. Every TaskTracker is configured with a…
Question
Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?
Options
- ANodemanager
- Bapplicationmanager
- CApplicationmaster
- DTasktracker
- EJobtracker
- FDatanode
- GNamenode
- HResourcemanager
How the community answered
(57 responses)- B2% (1)
- C2% (1)
- D82% (47)
- F9% (5)
- G5% (3)
Explanation
A TaskTracker is a slave node daemon in the cluster that accepts tasks (Map, Reduce and Shuffle operations) from a JobTracker. There is only One Task Tracker process run on any hadoop slave node. Task Tracker runs on its own JVM process. Every TaskTracker is configured with a set of slots, these indicate the number of tasks that it can accept. The TaskTracker starts a separate JVM processes to do the actual work (called as Task Instance) this is to ensure that process failure does not take down the task tracker.
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