explain Metadata in Namenode?

863

---

What is a 'block' in HDFS?

931

---

What is Derby database?

861

---

How many Daemon processes run on a Hadoop system?

1060

---

What are the limitations of importing RDBMS tables into Hcatalog directly?

903

---

How the Client communicates with HDFS?

1012

---

What is NoSQL?

876

---

What is Row Key?

939

---

What is a Task instance in Hadoop? Where does it run?1

820

---

What is IdentityMapper?

940

---

Why do we use Hadoop?

874

---

what is the typical block size of an HDFS block?

865

---

What is Hadoop Custom partitioner ?

952

---

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

1276

---

What stored in HDFS?

868

---