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HDFS Block abstraction

HDFS Block abstraction :

 

  • HDFS block size is usually 64MB-128MB and unlike other filesystems, a file smaller than the block size does not occupy the complete block size’s worth of memory.
  • The block size is kept so large so that less time is made doing disk seeks as compared to the data transfer rate.
  • Why do we need block abstraction :
  1. Files can be bigger than individual disks.
  2. Filesystem metadata does not need to be associated with each and every block.
  3. Simplifies storage management - Easy to figure out the number of blocks which can be stored on each disk.
  4. Fault tolerance and storage replication can be easily done on a per-block basis.

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