CDP (Big Data Hadoop Administrator) 3

Question 1

Which YARN scheduler allows resource pools to be shared among multiple groups while guaranteeing minimum capacity to each queue?

Accepted Answer

Capacity Scheduler

Answer

The Capacity Scheduler partitions cluster resources into queues with guaranteed minimum capacities that can burst into shared capacity.

Question 2

A DataNode disk fails but the node remains online. Which parameter determines how many volume failures a DataNode tolerates before it shuts itself down?

Accepted Answer

dfs.datanode.failed.volumes.tolerated

Answer

dfs.datanode.failed.volumes.tolerated sets how many data volumes can fail before the DataNode stops serving requests.

Question 3

What is the purpose of HDFS Federation?

Accepted Answer

Allowing multiple NameNodes to manage separate namespace volumes on the same cluster

Answer

HDFS Federation enables horizontal scaling of the namespace by having multiple independent NameNodes, each managing its own namespace volume.

Question 4

Which command would you use to check the health and block distribution of a specific HDFS path?

Accepted Answer

hdfs fsck /path -files -blocks -locations

Answer

hdfs fsck with -files -blocks -locations shows detailed block placement and health information for the specified path.

Question 5

In MapReduce, what is a 'speculative execution' and why is it used?

Accepted Answer

Running duplicate copies of slow tasks to mitigate straggler effects

Answer

Speculative execution launches redundant copies of lagging tasks on other nodes so the faster copy's result is used, reducing overall job latency.

CDP - Certified Data Professional Practice Test

CDP - Certified Data Professional Practice Test

CDP (Big Data Hadoop Administrator) 3