How can one set space quota in Hadoop (HDFS) directory?

28

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Explain how HDFS communicates with Linux native file system?

38

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If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

38

---

Replication causes data redundancy then why is is pursued in HDFS?

49

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What is a block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?

36

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What are the main hdfs-site.xml properties?

41

---

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

35

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How does HDFS ensure Data Integrity of data blocks stored in HDFS?

41

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What is the difference between RDBMS with Hadoop MapReduce?

795

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Explain what does the conf.setMapper Class do in MapReduce?

649

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How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

768

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What is a Speculative Execution in Hadoop MapReduce?

651

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Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

647

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In MapReduce, ideally how many mappers should be configured on a slave?

662

---

What counter in Hadoop MapReduce?

638

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