How a task is scheduled by a jobtracker?
What is the communication channel between client and namenode/datanode?
What is the InputFormat ?
what is the default replication factor in HDFS?
Is hadoop the future?
What are the port numbers of namenode, job tracker and task tracker?
What is a secondary namenode?
Is it necessary to know java to learn hadoop?
What are the different types of Znodes?
Explain the use of tasktracker in the hadoop cluster?
What is a heartbeat in HDFS?
What are the problems with Hadoop 1.0?
What is the use of Combiner?
What are the default configuration files that are used in hadoop?
What is a Record Reader in hadoop?