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update dsync implementation to fix a regression (#5513)

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Currently minio master requires 4 servers, we
have decided to run on a minimum of 2 servers
instead - fixes a regression from previous
releases where 3 server setups were supported.
This commit is contained in:
Harshavardhana
2018-02-12 01:46:12 -08:00
committed by Nitish Tiwari
parent 4f73fd9487
commit 8de6cf4124
4 changed files with 16 additions and 14 deletions
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17
vendor/github.com/minio/dsync/dsync.go generated vendored
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@@ -18,6 +18,7 @@ package dsync
import (
"errors"
"math"
)
// Dsync represents dsync client object which is initialized with
@@ -41,12 +42,10 @@ type Dsync struct {
// New - initializes a new dsync object with input rpcClnts.
func New(rpcClnts []NetLocker, rpcOwnNode int) (*Dsync, error) {
if len(rpcClnts) < 4 {
return nil, errors.New("Dsync is not designed for less than 4 nodes")
} else if len(rpcClnts) > 16 {
return nil, errors.New("Dsync is not designed for more than 16 nodes")
} else if len(rpcClnts)%2 != 0 {
return nil, errors.New("Dsync is not designed for an uneven number of nodes")
if len(rpcClnts) < 2 {
return nil, errors.New("Dsync is not designed for less than 2 nodes")
} else if len(rpcClnts) > 32 {
return nil, errors.New("Dsync is not designed for more than 32 nodes")
}
if rpcOwnNode > len(rpcClnts) {
@@ -55,8 +54,10 @@ func New(rpcClnts []NetLocker, rpcOwnNode int) (*Dsync, error) {
ds := &Dsync{}
ds.dNodeCount = len(rpcClnts)
ds.dquorum = ds.dNodeCount/2 + 1
ds.dquorumReads = ds.dNodeCount / 2
// With odd number of nodes, write and read quorum is basically the same
ds.dquorum = int(ds.dNodeCount/2) + 1
ds.dquorumReads = int(math.Ceil(float64(ds.dNodeCount) / 2.0))
ds.ownNode = rpcOwnNode
// Initialize node name and rpc path for each NetLocker object.