What is TaskTracker?

482

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Give a brief overview of Hadoop history?

415

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How Big is ‘Big Data’?

426

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How can you set an arbitrary number of mappers to be created for a job in Hadoop?

459

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How many job tracker processes can run on a single Hadoop cluster?

470

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What are some of the characteristics of Hadoop framework?

436

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Where are Hadoop’s configuration files located?

507

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Can you give a detailed overview about the Big Data being generated by Facebook?

427

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How to remove safemode of namenode forcefully in HDFS?

36

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Who divides the file into Block while storing inside hdfs in hadoop?

49

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What are file permissions in HDFS? how does HDFS check permissions for files/directory?

51

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How one can change Replication factor when Data is already stored in HDFS

44

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Explain HDFS “Write once Read many” pattern?

34

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Why is block size set to 128 MB in HDFS?

41

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What should be the HDFS Block size to get maximum performance from Hadoop cluster?

37

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