What is partioner in hadoop? Where does it run,mapper or reducer?
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Define a datanode?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
what is a datanode?
Who invented hadoop?
What is zookeeper in hadoop?
Is hadoop open source?
How to change replication factor of files already stored in HDFS?
How can one increase replication factor to a desired value in Hadoop?
How to enable recycle bin in hadoop?
Define a combiner?
What do you know about sequencefileinputformat?
explain Metadata in Namenode?
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