What is a "map" in Hadoop?

789

---

What is a "reducer" in Hadoop?

868

---

what is Speculative Execution?

830

---

Explain JobConf in MapReduce.

808

---

What is OutputCommitter?

807

---

How is reporting controlled in hadoop?

780

---

What is Hadoop Map Reduce ?

803

---

what does the text input format do?

811

---

What happens when a datanode fails ?

771

---

In Hadoop, which file controls reporting in Hadoop?

771

---

how can you debug Hadoop code?

835

---

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

783

---

What are the primary phases of a Reducer?

820

---

how indexing in HDFS is done?

853

---

What is the role of a MapReduce partitioner?

802

---