[Gluster-devel] pluggability of some aspects in afr/nsr/ec

[Pranith Kumar Karampuri]

hi,
          I want to understand how are you guys planning to integrate 
NSR volumes to the existing CLIs. Here are some thoughts I had, wanted 
to know your thoughts:
At the heart of both the replication/ec schemes we have
1) synchronization mechanisms
        a) afr,ec does it using locks
        b) nsr does it using leader election
2) Metadata to figure out the healing/reconciliation aspects
        a) afr,ec does it using xattrs
        b) nsr does it using journals

I want to understand if there is a possibility of exposing these as 
different modules that we can mix and match, using options. If the users 
choose 1b, 2b it becomes nsr and 1a, 2a becomes afr/ec. In future if we 
come up with better metadata journals/stores it should be easy to plug 
them is what I'm thinking. The idea I have is based on the workload, 
users should be able to decide which pair of synchronization/metadata 
works best for them (Or we can also recommend based on our tests). 
Wanted to seek your inputs.

Pranith