What is difference between regular file system and HDFS?

1063

---

What is rack-aware replica placement policy?

1031

---

Are Namenode and job tracker on the same host?

1459

---

What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

1107

---

What is HDFS Federation?

990

---

What are watches?

1035

---

Explain the Job OutputFormat?

968

---

Virtual Box & Ubuntu Installation?

996

---

What is the difference between HDFS and NAS ?

1376

---

How Mapper is instantiated in a running job?

997

---

Where do you specify the Mapper Implementation?

1028

---

What is the meaning of speculative execution in Hadoop? Why is it important?

1061

---

What is the InputFormat ?

1025

---

Command to format the NameNode?

945

---

Who is a 'user' in HDFS?

892

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