Updated: May 31, 2026
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1. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02
A) Hadoop01 becomes inactive and hadoop02 becomes the active namenode
B) Hadoop01 is fenced, and hadoop02 becomes the active namenode
C) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode
D) Hadoop02 is fenced, and hadoop01 becomes active namenode
2. Which command does Hadoop offer to discover missing or corrupt HDFS data?
A) 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.
B) The map-only checksum utility,
C) Fsck
D) Dskchk
E) Du
3. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?
A) the current state of the file system according to the namenode
B) Number of datanodes
C) Configure capacity of your cluster
D) The current state of the file system returned from scanning individual blocks on each datanode
E) the location for every block
F) Under-replicated blocks
G) Number of dead datanodes
H) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)
4. Identify two features/issues that MapReduce v2 (MRv2/YARN) is designed to address:
A) Single point of failure in the NameNode.
B) Reduce complexity of the MapReduce APIs.
C) HDFS latency.
D) Resource pressure on the JobTrackr
E) Standardize on a single MapReduce API.
F) Ability to run frameworks other than MapReduce, such as MPI.
5. 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 on B can read the 300MB that has been written so far.
B) Client application B must wait until the entire file has been written, and will then read its entire contents.
C) Client application B returns an error
D) Application B can read 256MB of the file
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: C | Question # 3 Answer: B,D,F,H | Question # 4 Answer: D,F | Question # 5 Answer: D |
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