You have data already stored in HDFS and are considering using HBase. Which additional feature
does HBase provide to HDFS?

A.
Random writes

B.
Batch processing

C.
Fault tolerance

D.
Scalability

Explanation:
HBase adds random read/write access to HDFS.
Note:
Hadoop is scalable, but…
* MapReduce is slow and difcult
* Does not support random writes
* Poor support for random reads
Reference:http://borthakur.com/ftp/SIGMODRealtimeHadoopPresentation.pdf(11th slide)