Can you define a block and block scanner in hdfs?

51

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Can you explain about the indexing process in hdfs?

39

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Can you explain apache kafka?

520

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Which are the elements of kafka?

614

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What is the inputsplit in map reduce software?

630

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Map reduce jobs take too long. What can be done to improve the performance of the cluster?

706

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Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

611

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Is apache spark going to replace hadoop?

362

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What are the advantage of spark?

292

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What is the disadvantage of spark sql?

371

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When to use spark sql?

311

---

What are the great features of spark sql?

292

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Can you explain apache spark?

322

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What is apache presto?

3

---

Describe REVERSE function in Hive with example?

722

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