Setting Compression and Chunk Size

Each directory in MapR storage contains a hidden file called .dfs_attributes that controls compression and chunk size. To change these attributes, change the corresponding values in the file. 
# lines beginning with # are treated as comments 
Compression=lz4 
ChunkSize=268435456
Valid Values:
  • Compression: lz4, lzf, zlib, or false
  • Chunk size (in bytes): a multiple of 65535 (64 K) or zero (no chunks). Example: 131072

You can also set compression and chunksize using the hadoop mfs command.