Define a datanode?
What is Writable & WritableComparable interface?
How do you define "block" in HDFS?
What is a block and block scanner in HDFS?
How many instances of JobTracker can run on a Hadoop Cluser?
Explain the benefits of block transfer?
How to resolve IOException: Cannot create directory
Is hadoop based on google mapreduce?
What is Apache Hadoop YARN?
Do we need to give a password, even if the key is added in ssh?
Is secondary namenode a substitute to the namenode?
What alternate way does HDFS provides to recover data in case a Namenode
What do you know about sequencefileinputformat?