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Bring semantic versioning to provide for rolling upgrades (#5495)

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This PR brings semver capabilities in our RPC layer to
ensure that we can upgrade the servers in rolling fashion
while keeping I/O in progress. This is only a framework change
the functionality remains the same as such and we do not
have any special API changes for now. But in future when
we bring in API changes we will be able to upgrade servers
without a downtime.

Additional change in this PR is to not abort when serverVersions
mismatch in a distributed cluster, instead wait for the quorum
treat the situation as if the server is down. This allows
for administrator to properly upgrade all the servers in the cluster.

Fixes #5393
This commit is contained in:
Harshavardhana
2018-02-06 15:07:17 -08:00
committed by kannappanr
parent 48218272cc
commit 1164fc60f3
14 changed files with 221 additions and 52 deletions
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4
cmd/typed-errors.go
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@@ -42,8 +42,8 @@ var errDataTooSmall = errors.New("Object size smaller than expected")
// errServerNotInitialized - server not initialized.
var errServerNotInitialized = errors.New("Server not initialized, please try again")
// errServerVersionMismatch - server versions do not match.
var errServerVersionMismatch = errors.New("Server versions do not match")
// errRPCAPIVersionUnsupported - unsupported rpc API version.
var errRPCAPIVersionUnsupported = errors.New("Unsupported rpc API version")
// errServerTimeMismatch - server times are too far apart.
var errServerTimeMismatch = errors.New("Server times are too far apart")