Commits on Nov 29, 2017

1. ipfs-cluster-service state upgrade cli command …

       ipfs-cluster-service now has a migration subcommand that upgrades
       persistant state snapshots with an out-of-date format version to the
       newest version of raft state. If all cluster members shutdown with
       consistent state, upgrade ipfs-cluster, and run the state upgrade command,
       the new version of cluster will be compatible with persistent storage.
       ipfs-cluster now validates its persistent state upon loading it and exits
       with a clear error in the case the state format version is not up to date.
   
       Raft snapshotting is enforced on all shutdowns and the json backup is no
       longer run.  This commit makes use of recent changes to libp2p-raft
       allowing raft states to implement their own marshaling strategies. Now
       mapstate handles the logic for its (de)serialization.  In the interest of
       supporting various potential upgrade formats the state serialization
       begins with a varint (right now one byte) describing the version.
   
       Some go tests are modified and a go test is added to cover new ipfs-cluster
       raft snapshot reading functions.  Sharness tests are added to cover the
       state upgrade command.

   

   ZenGround0 committed Nov 29, 2017
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