GFS - Google File System

architecture

chunk size: 64 MB

Problems

1. Single point of failure

   shadow master

2. Scalability bottleneck:

   send metadata only

special terms: consistent and defined

1. consistent: all replicas have the same value

2. defined: replica reflects the mutation, consistent

3. consistent but not defined:

   Client: A A B

   Server: A B A

4. defined but not consistent:

   Server 1: S S S

   Server 2: S S F