What is a Task instance in Hadoop? Where does it run?1
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What is the communication channel between client and namenode/datanode?
What problems can be addressed by using Zookeeper?
Is hadoop open source?
What is HDFS - Hadoop Distributed File System?
Explain the Job OutputFormat?
What stored in HDFS?
How to enable/configure the compression of map output data in hadoop?
What is the best hardware configuration to run Hadoop?
Main Components of Hadoop?
Are Namenode and job tracker on the same host?
How will format the HDFS ?
How we can change Replication factor when Data is on the fly?
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