Which of the following is used for the MapReduce job Tracker node?
jobtracker
Excellent ! Your Answer is Correct. Explanation: tasktracker runs a MapReduce task Tracker node.
tasktracker
mradmin
None of the Option is Correct
Category: HDFS Administration and Maintenance
Which of the following command runs the HDFS secondary namenode?
Which of the following command runs the HDFS secondary namenode?
secondarynamenode
Excellent ! Your Answer is Correct. Explanation: The secondary NameNode merges the fsimage and the edits log files periodically and keeps edits log size within a limit.
secondary namenode
secondary_namenode
None of the Option is Correct
__________ command is used to interact and view Job Queue information in HDFS.
__________ command is used to interact and view Job Queue information in HDFS.
queue
Excellent ! Your Answer is Correct. Explanation: Hadoop script can be used to invoke any class.
priority
dist
All Options are Correct
__________ mode is a Namenode state in which it does not accept changes to the name space.
__________ mode is a Namenode state in which it does not accept changes to the name space.
Rollback
Excellent ! Your Answer is Correct. Explanation: dfsadmin runs a HDFS dfsadmin client.
Safe
Recover
None of the Option is Correct
_________ command is used to copy file or directories recursively.
_________ command is used to copy file or directories recursively.
distcp
Excellent ! Your Answer is Correct. Explanation: Usage of the distcp command: hadoop distcp .
dtcp
dcp
distc
Point out the wrong statement.
Point out the wrong statement.
classNAME displays the class name needed to get the Hadoop jar
Excellent ! Your Answer is Correct. Explanation: classpath prints the class path needed to get the Hadoop jar and the required libraries.
Balancer Runs a cluster balancing utility
An administrator can simply press Ctrl-C to stop the rebalancing process
None of the Option is Correct
In ___________ mode, the NameNode will interactively prompt you at the command line about possible courses of action you can take to recover your data.
In ___________ mode, the NameNode will interactively prompt you at the command line about possible courses of action you can take to recover your data.
recovery
Excellent ! Your Answer is Correct. Explanation: Recovery mode can cause you to lose data, you should always backup your edit log and fsimage before using it.
partial
full
commit
HDFS supports the ____________ command to fetch Delegation Token and store it in a file on the local system.
HDFS supports the ____________ command to fetch Delegation Token and store it in a file on the local system.
fetchdt
Excellent ! Your Answer is Correct. Explanation: Delegation token can be later used to access secure server from a non secure client.
fetdt
fsk
rec
Which hdfs command is used to check for various inconsistencies?
Which hdfs command is used to check for various inconsistencies?
fsck
Excellent ! Your Answer is Correct. Explanation: fsck is designed for reporting problems with various files, for example, missing blocks for a file or under-replicated blocks.
fsk
fetchdt
None of the Option is Correct
Point out the correct statement.
Point out the correct statement.
All hadoop commands are invoked by the bin/hadoop script
Excellent ! Your Answer is Correct. Explanation: Running the hadoop script without any arguments prints the description for all commands.
Hadoop has an option parsing framework that employs only parsing generic options
Archive command creates a hadoop archive
All Options are Correct