What are combiners and its purpose?
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How to restart Namenode?
Can hbase run without hadoop?
What is inputformat in hadoop?
What are the modules that constitute the Apache Hadoop 2.0 framework?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is the sequencefileinputformat in hadoop?
What is Row Key?
Explain the features of pseudo mode?
How client application interacts with the NameNode?
What are the port numbers of namenode, job tracker and task tracker?
What is Input Split in hadoop?
What is the main purpose of HDFS fsck command?
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