Which of the following is not a valid Hadoop config file?
hadoop-site.xml
Excellent ! Your Answer is Correct.
mapred-site.xml
core-site.xml
Masters
Tag: Hadoop MCQs
Point out the wrong statement.
Point out the wrong statement.
bfs executes a dfs command from the Hive shell
Excellent ! Your Answer is Correct. Explanation: dfs executes a dfs command from the Hive shell.
source FILE executes a script file inside the CLI
hive is Query language similar to SQL
None of the Option is Correct
The HDFS file system is temporarily unavailable whenever the HDFS ________ is down.
The HDFS file system is temporarily unavailable whenever the HDFS ________ is down.
NameNode
Excellent ! Your Answer is Correct. Explanation: When the HDFS NameNode is restarted it recovers its metadata.
DataNode
ActionNode
None of the Option is Correct
_________ stores its metadata on multiple disks that typically include a non-local file server.
_________ stores its metadata on multiple disks that typically include a non-local file server.
NameNode
Excellent ! Your Answer is Correct. Explanation: HDFS tolerates failures of storage servers (called DataNodes) and its disks.
DataNode
ActionNode
None of the Option is Correct
HDFS, by default, replicates each data block _____ times on different nodes and on at least ____ racks.
HDFS, by default, replicates each data block _____ times on different nodes and on at least ____ racks.
3, 2
Excellent ! Your Answer is Correct. Explanation: HDFS has a simple yet robust architecture that was explicitly designed for data reliability in the face of faults and failures in disks, nodes and networks.
1, 2
2, 3
All Options are Correct
__________ support storing a copy of data at a particular instant of time.
__________ support storing a copy of data at a particular instant of time.
Snapshots
Excellent ! Your Answer is Correct. Explanation: One usage of the snapshot feature may be to roll back a corrupted HDFS instance to a previously known good point in time.
Datanots
Data Image
All Options are Correct
The ____________ and the EditLog are central data structures of HDFS.
The ____________ and the EditLog are central data structures of HDFS.
FsImages
Excellent ! Your Answer is Correct. Explanation: A corruption of these files can cause the HDFS instance to be non-functional.
DsImage
FsImages
All Options are Correct
Which of the following phases occur simultaneously?
Which of the following phases occur simultaneously?
Shuffle and Sort
Excellent ! Your Answer is Correct. Explanation: The shuffle and sort phases occur simultaneously; while map-outputs are being fetched they are merged.
Reduce and Sort
Shuffle and Map
All Options are Correct
Hadoop achieves reliability by replicating the data across multiple hosts, and hence does not require ________ storage on hosts.
Hadoop achieves reliability by replicating the data across multiple hosts, and hence does not require ________ storage on hosts.
RAID
Excellent ! Your Answer is Correct. With the default replication value, 3, data is stored on three nodes: two on the same rack, and one on a different rack.
Standard RAID levels
ZFS
Operating system
Which of the following platforms does Hadoop run on ?
Which of the following platforms does Hadoop run on ?
Cross-platform
Excellent ! Your Answer is Correct. Hadoop has support for cross platform operating system.
Bare metal
Debian
Unix-like