Choose three reasons why should you run the HDFS balancer periodically?
A.
To improve data locality MapReduce
B.
To ensure that there is capacity in HDFS for additional data
C.
To ensure that all blocks in the cluster are 128MB in size
D.
To help HDFS deliver consistent performance under heavy loads
E.
To ensure that there is consistent disk utilization across the DataNodes
A,D,E
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Answer is “A, D, and E”
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only E
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A,D,E
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Correct answer A, D, E
Answer E because the HDFS balancer re-balances data across the DataNodes, moving blocks from overutilized to underutilized nodes. So correct answer is also A because balancer does not take data locality into consideration unless it is moving a block, but with hdfs balancer command you move blocks! Hdfs balancing it helps to have better performance!
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A,D&E
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A, D, E
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