What is Block in HDFS?

This topic has 1 reply, 1 voice, and was last updated 5 years, 7 months ago by DataFlair Team.

Viewing 1 reply thread

Author

Posts
- September 20, 2018 at 2:23 pm #5144
  
  DataFlair Team
  Spectator
  
  What is Block in HDFS? What is the default block size?
  What is Data Block in Hadoop Distributed Filesystem?
  What is default Block size in Hadoop?
- September 20, 2018 at 2:23 pm #5147
  DataFlair Team
  Spectator
  In Hadoop, HDFS splits huge file into small chunks that is called Blocks. These are the smallest unit of data in file system.
  
  NameNode (Master) will decide where data store in theDataNode (Slaves). All block of the files is the same size except the last block.
  
  In the Apache Hadoop, the default block size is 128 MB .
  
  It can be easily changed by edit the hdfs-site.xml and add the “dfs.block.size” property.
  
  i.e
```
<property>
<name>dfs.block.size<name>
<value>256217728<value>
<description>Block size<description>
<property>
```
  Follow the link to learn more about Data Blocks in Hadoop.
Author

Posts

Viewing 1 reply thread

You must be logged in to reply to this topic.