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GFS vs HDFS:

File Structure:

HDFS:

Divided in 128MB Blocks
NameNode holds block replica as 2 files:One for Data , One for checksum

GFS:

Divided in 64MB Chunks
Chunks divided in 64kb blocks
Each block has 32bit checksum

$ Data Flow \(I/O operations\) – GFS◦ Leases at primary \(60 sec. default\)◦ Client read - Sends request to master Caches li...$

$ Data Flow \(I/O operations\) – HDFS◦ No Leases \(client decides where to write\)◦ Exposes the file’s block’s locations \(enab...$

HDFS is slower than GFS

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