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What happen if one of the datanodes has much slower cpu?
After increasing the replication level, I still see that data is under replicated. What could be wrong?
Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
What is the difference between a hadoop database and relational database?
Can we deploye job tracker other than name node?
What is difference between secondary namenode, checkpoint namenode & backupnode?
Name the most common input formats defined in hadoop?
Which one is default?
Is it possible to have hadoop job output in multiple directories?
What is tasktracker in hadoop?
What is a combiner in hadoop?
Have you ever used counters in hadoop?
What are some typical functions of job tracker in hadoop?
Can you define inputsplit in hadoop?
What daemons run on master nodes?
