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Clarify how ordering in hdfs is finished?
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Why use hadoop?
Have you ever used counters in hadoop?
What is NameNode? How NameNode tackle Datanode failures in Hadoop?
Can you explain sequence file in hadoop?
Which directory does hadoop install to?
Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
What do you understand by standalone (or local) mode?
Why Hadoop performs replication, although it results in data redundancy?
While starting hadoop services, datanode service is not running?
What is the role of the secondary namenode?
Can you explain speculative execution?
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