What happens when a datanode fails ?

778

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In Hadoop, which file controls reporting in Hadoop?

774

---

how can you debug Hadoop code?

842

---

For a job in Hadoop, is it possible to change the number of mappers to be created?

788

---

What are the primary phases of a Reducer?

826

---

how indexing in HDFS is done?

855

---

What is the role of a MapReduce partitioner?

806

---

Is it important for Hadoop MapReduce jobs to be written in Java?

845

---

what job does the conf class do?

792

---

What is the key- value pair in Hadoop MapReduce?

679

---

What is InputFormat in Hadoop MapReduce?

669

---

What are the various InputFormats in Hadoop?

650

---

Explain InputSplit in Hadoop MapReduce?

676

---

How much space will the split occupy in Mapreduce?

672

---

What is a RecordReader in Hadoop MapReduce?

676

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