What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

606

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Is it possible to rename the output file?

491

---

how JobTracker schedules a task ?

532

---

what is NameNode in Hadoop?

542

---

what does the conf.setMapper Class do ?

530

---

how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

459

---

What is SequenceFileInputFormat?

524

---

What is a "map" in Hadoop?

495

---

What is a "reducer" in Hadoop?

532

---

what is Speculative Execution?

522

---

Explain JobConf in MapReduce.

517

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What is OutputCommitter?

502

---

How is reporting controlled in hadoop?

462

---

What is Hadoop Map Reduce ?

533

---

what does the text input format do?

515

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