Can you define a block and block scanner in hdfs?

47

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Can you explain about the indexing process in hdfs?

36

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Can you explain apache kafka?

484

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Which are the elements of kafka?

578

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What is the inputsplit in map reduce software?

593

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

652

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

578

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Is apache spark going to replace hadoop?

344

---

What are the advantage of spark?

277

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What is the disadvantage of spark sql?

360

---

When to use spark sql?

290

---

What are the great features of spark sql?

276

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Can you explain apache spark?

305

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What is apache presto?

3

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Describe REVERSE function in Hive with example?

668

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