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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Which two daemons must be installed on master nodes in hadoop cluster running mapreduce V1 (MRV1)?

A) Datanode
B) Hmaster
C) Namenode
D) Resourcemanager
E) ApplicationMaster
F) Tasktracker
G) Zookeeper

2. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) The map-only checksum utility,
B) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
C) Fsck
D) Dskchk
E) Du

3. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Client application B must wait until the entire file has been written, and will then read its entire contents.
B) Application B can read 256MB of the file
C) Client application B returns an error
D) Client application on B can read the 300MB that has been written so far.

4. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The HDFS cluster is in the safe mode.
B) One physical host crashed.
C) The DataNode JVM on one host is not active.
D) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.

5. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that there is consistent disk utilization across the DataNodes.
B) To improve data locality for MapReduce tasks.
C) To ensure that there is capacity in HDFS tor additional data.
D) To ensure that all blocks in the cluster are 128MB in size.
E) To help HDFS deliver consistent performance under heavy loads.

Solutions: