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Question ID 20593

It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

Option A

To improve data locality for MapReduce tasks.

Option B

To ensure that there is capacity in HDTS for additional data.

Option C

To help HDFS deliver consistent performance under heavy loads.

Option D

To ensure that all blocks in the cluster are 128MB in size.

Option E

To ensure that there is consistent disk utilization across the DataNodes.

Correct Answer B,C,E
Explanation Reference: http://hadoop.apache.org/docs/hdfs/r0.21.0/api/org/apache/hadoop/hdfs/server/balancer/Ba lancer.html


Question ID 20594

You are running a Hadoop cluster with all monitoring facilities properly configured. Which
scenario will go undetected?

Option A

Map or reduce tasks that are stuck in an infinite loop.

Option B

 HDFS is almost full.

Option C

The NameNode goes down.

Option D

 A DataNode is disconnected from the cluster.

Option E

MapReduce jobs that are causing excessive memory swaps.

Correct Answer A
Explanation

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