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What is heartbeat in hadoop?
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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 are the four modules that make up the Apache Hadoop framework?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
We have already sql then why nosql?
Suppose hadoop spawned 100 tasks for a job and one of the tasks failed. What will hadoop do?
What is the default replication factor and how will you change it?
What happens when two clients try to access the same file in the hdfs?
If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?
Can you explain bloommapfile.
How jobtracker assign tasks to the tasktracker?
How can you native libraries be included in yarn jobs?
Explain the key benefits of using storm for real time processing?
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