explain Metadata in Namenode?

982

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What is a 'block' in HDFS?

1027

---

What is Derby database?

958

---

How many Daemon processes run on a Hadoop system?

1136

---

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

1002

---

How the Client communicates with HDFS?

1095

---

What is NoSQL?

966

---

What is Row Key?

1035

---

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

888

---

What is IdentityMapper?

1051

---

Why do we use Hadoop?

964

---

what is the typical block size of an HDFS block?

961

---

What is Hadoop Custom partitioner ?

1047

---

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

1367

---

What stored in HDFS?

978

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