How can we check whether namenode is working or not?
How to enable/configure the compression of map output data in hadoop?
What do you know about keyvaluetextinputformat?
Explain what is the purpose of RecordReader in Hadoop?
What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
What is the main purpose of HDFS fsck command?
What is Rack awareness?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
What alternate way does HDFS provides to recover data in case a Namenode
What are the default configuration files that are used in hadoop?
Is hadoop obsolete?
What is the difference between SQL and NoSQL?
Mention what is the use of Context Object?
What are the modes in which Apache Hadoop run?
Which are the two types of 'writes' in HDFS?