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What a task tracker is in hadoop?
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Are job tracker and task trackers present in separate machines?
What do you know about the speculative execution?
What is Disk Balancer in Hadoop?
Name the most common Input Formats defined in Hadoop? Which one is default?
Compare Hadoop and RDBMS?
what is next step after mapper or maptask?
What are 'slaves' and 'masters' in Hadoop?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
Why is Data Block size set to 128 MB in Hadoop?
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
What is the non dfs used?
Ideally what should be the replication factor in hadoop?
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