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concurrency, benchmark: read-committed STM isolation policy

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This commit is contained in:
Anthony Romano
2016-05-31 01:55:58 -07:00
parent f34a9350c3
commit 51551abef5
2 changed files with 17 additions and 1 deletions
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14
clientv3/concurrency/stm.go
View File

@@ -56,6 +56,12 @@ func NewSTMSerializable(ctx context.Context, c *v3.Client, apply func(STM) error
return runSTM(s, apply)
}
// NewSTMReadCommitted initiates a new read committed transaction.
func NewSTMReadCommitted(ctx context.Context, c *v3.Client, apply func(STM) error) (*v3.TxnResponse, error) {
s := &stmReadCommitted{stm{client: c, ctx: ctx, getOpts: []v3.OpOption{v3.WithSerializable()}}}
return runSTM(s, apply)
}
type stmResponse struct {
resp *v3.TxnResponse
err error
@@ -234,6 +240,14 @@ func (s *stmSerializable) commit() *v3.TxnResponse {
return nil
}
type stmReadCommitted struct{ stm }
// commit always goes through when read committed
func (s *stmReadCommitted) commit() *v3.TxnResponse {
s.rset = nil
return s.stm.commit()
}
func isKeyCurrent(k string, r *v3.GetResponse) v3.Cmp {
rev := r.Header.Revision + 1
if len(r.Kvs) != 0 {

4
tools/benchmark/cmd/stm.go
View File

@@ -52,7 +52,7 @@ var (
func init() {
RootCmd.AddCommand(stmCmd)
stmCmd.Flags().StringVar(&stmIsolation, "isolation", "r", "Repeatable Reads (r) or Serializable (s)")
stmCmd.Flags().StringVar(&stmIsolation, "isolation", "r", "Read Committed (c), Repeatable Reads (r), or Serializable (s)")
stmCmd.Flags().IntVar(&stmKeyCount, "keys", 1, "Total unique keys accessible by the benchmark")
stmCmd.Flags().IntVar(&stmTotal, "total", 10000, "Total number of completed STM transactions")
stmCmd.Flags().IntVar(&stmKeysPerTxn, "keys-per-txn", 1, "Number of keys to access per transaction")
@@ -78,6 +78,8 @@ func stmFunc(cmd *cobra.Command, args []string) {
}
switch stmIsolation {
case "c":
mkSTM = v3sync.NewSTMReadCommitted
case "r":
mkSTM = v3sync.NewSTMRepeatable
case "s":