The default size of HDFS Data Block is 128MB. This means that each block of data stored in HDFS is 128MB in size. This value can be changed, but it is important to choose a value that is appropriate for the size of the data being stored and the performance requirements of the application.
A smaller block size can improve performance for applications that need to access small amounts of data quickly. However, it can also increase the amount of overhead required to store and manage the data. A larger block size can improve performance for applications that need to access large amounts of data quickly. However, it can also increase the amount of time it takes to read or write a block of data.
The default block size of 128MB is a good compromise for most applications. It provides good performance for both small and large reads and writes. It also minimizes the amount of overhead required to store and manage the data.
Here are some additional details about each option:
- Option A: 16MB. This is a relatively small block size. It may be appropriate for applications that need to access small amounts of data quickly. However, it may not be appropriate for applications that need to access large amounts of data quickly.
- Option B: 32MB. This is a medium-sized block size. It may be appropriate for a variety of applications.
- Option C: 64MB. This is a relatively large block size. It may be appropriate for applications that need to access large amounts of data quickly. However, it may not be appropriate for applications that need to access small amounts of data quickly.
- Option D: 128MB. This is the default block size for HDFS. It is a good compromise for most applications.