What does each block of a file contain where it is return into HDFS?

Question

Options

• AEach block writes a separate meta file containing information on the file name of which the block is a part
• BEach block has a header and footer containing metadata
• CEach block contains only data from the file
• DEach block as a header containing metadata

• A
  77% (23)
• B
  3% (1)
• C
  7% (2)
• D
  13% (4)

Explanation

The other files in the datanode's current storage directory are the files with the blk_ prefix. There are two types: the HDFS blocks themselves (which just consist of the file's raw bytes) and the metadata for a block (with a .meta suffix). A block file just consists of the raw bytes of a portion of the file being stored; the metadata file is made up of a header with version and type information, followed by a series of checksums for sections of the block.

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