Explain the usage of Context Object?
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If datanodes increase, then do we need to upgrade namenode?
Can you define a checkpoint?
What is the number of default partitioner in hadoop?
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 Slot in Hadoop v1? Why was it removed from Hadoop v2?
How does job tracker schedule a job for the task tracker?
How Hadoop is cost-effective?
What is the block size in Hadoop?
How does speculative execution work in Hadoop?
Can you explain bloommapfile.
How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?
What kind of hardware is best for hadoop?
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