What is difference between regular file system and HDFS?

993

---

What is rack-aware replica placement policy?

968

---

Are Namenode and job tracker on the same host?

1404

---

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

1059

---

What is HDFS Federation?

927

---

What are watches?

978

---

Explain the Job OutputFormat?

912

---

Virtual Box & Ubuntu Installation?

929

---

What is the difference between HDFS and NAS ?

1316

---

How Mapper is instantiated in a running job?

944

---

Where do you specify the Mapper Implementation?

942

---

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

1015

---

What is the InputFormat ?

957

---

Command to format the NameNode?

886

---

Who is a 'user' in HDFS?

846

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