clean up etcd backing for sequence persistent storage. It uses some OS

specific calls and is not OS-agnostic.

go/metastore/backing_test.go

@@ -14,11 +14,6 @@ func TestFileBacking(t *testing.T) {
 	verifySetGet(t, ms)
 }
 
-func TestEtcdBacking(t *testing.T) {
-	ms := &MetaStore{NewMetaStoreEtcdBacking("http://localhost:4001")}
-	verifySetGet(t, ms)
-}
-
 func verifySetGet(t *testing.T, ms *MetaStore) {
 	data := uint64(234234)
 	ms.SetUint64("/tmp/sequence", data)

go/metastore/etcd_backing.go

@@ -1,53 +0,0 @@
-// +build ignore
-
-package metastore
-
-import (
-	"code.google.com/p/weed-fs/go/glog"
-	"errors"
-	"github.com/coreos/go-etcd/etcd"
-	"strings"
-)
-
-// store data on etcd
-
-type MetaStoreEtcdBacking struct {
-	client *etcd.Client
-}
-
-func NewMetaStoreEtcdBacking(etcdCluster string) *MetaStoreEtcdBacking {
-	m := &MetaStoreEtcdBacking{}
-	m.client = etcd.NewClient(strings.Split(etcdCluster, ","))
-	return m
-}
-
-func (m MetaStoreEtcdBacking) Set(path, val string) error {
-	res, e := m.client.Set(path, val, 0)
-	glog.V(2).Infof("etcd set response: %+v\n", res)
-	return e
-}
-
-func (m MetaStoreEtcdBacking) Get(path string) (string, error) {
-	results, err := m.client.Get(path)
-	for i, res := range results {
-		glog.V(2).Infof("[%d] get response: %+v\n", i, res)
-	}
-	if err != nil {
-		return "", err
-	}
-	if results[0].Key != path {
-		return "", errors.New("Key Not Found:" + path)
-	}
-	return results[0].Value, nil
-}
-
-func (m MetaStoreEtcdBacking) Has(path string) (ok bool) {
-	results, err := m.client.Get(path)
-	if err != nil {
-		return false
-	}
-	if results[0].Key != path {
-		return false
-	}
-	return true
-}