Answer / Dharmendra Meena

The block size in HDFS is set to 64MB by default for several reasons: efficiency (it balances between disk I/O and network bandwidth), fault tolerance (large blocks reduce the number of blocks per file, reducing the likelihood of losing multiple blocks in a single failure), and scalability (larger block sizes enable HDFS to handle larger files more efficiently).

What is the difference between MapReduce engine and HDFS cluster?

1 Answers  

---

Why HDFS performs replication, although it results in data redundancy in Hadoop?

1 Answers  

---

What does heartbeat in hdfs means?

1 Answers  

---

Does hdfs enable a customer to peruse a record, which is already opened for writing?

1 Answers  

---

How to transfer data from Hive to HDFS?

1 Answers  

---

What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

1 Answers  

---

How to create Users in hadoop HDFS?

1 Answers  

---

How much Metadata will be created on NameNode in Hadoop?

1 Answers  

---

What is the difference between namenode, backup node and checkpoint namenode?

1 Answers  

---

Can we have different replication factor of the existing files in hdfs?

1 Answers  

---

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

1 Answers  

---

Explain the key features of hdfs?

1 Answers  

---