mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-05 05:18:52 +08:00
05df70973c
Added retry method and unit test cases for retrying etcd server start. New to open source and Go language. Please reject if this is not the requirement/ specify the modifications needed in code. issue : #17569 Signed-off-by: Charles Kakumanu <charles_kakumanu@apple.com> Co-authored-by: Charles Kakumanu <charles_kakumanu@apple.com>
614 lines
18 KiB
Go
614 lines
18 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// limitations under the License.
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// See the License for the specific language governing permissions and
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package etcdkv
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import (
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"context"
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"fmt"
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"path"
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"sync"
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"time"
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"github.com/cockroachdb/errors"
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clientv3 "go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/server/v3/embed"
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"go.etcd.io/etcd/server/v3/etcdserver/api/v3client"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/pkg/kv"
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"github.com/milvus-io/milvus/pkg/kv/predicates"
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"github.com/milvus-io/milvus/pkg/log"
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"github.com/milvus-io/milvus/pkg/util/merr"
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)
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// implementation assertion
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var _ kv.MetaKv = (*EmbedEtcdKV)(nil)
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const (
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defaultRetryCount = 3
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defaultRetryInterval = 1 * time.Second
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)
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// EmbedEtcdKV use embedded Etcd instance as a KV storage
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type EmbedEtcdKV struct {
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client *clientv3.Client
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rootPath string
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etcd *embed.Etcd
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closeOnce sync.Once
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requestTimeout time.Duration
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}
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func retry(attempts int, sleep time.Duration, fn func() error) error {
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for i := 0; ; i++ {
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err := fn()
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if err == nil || i >= (attempts-1) {
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return err
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}
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time.Sleep(sleep)
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}
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}
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// NewEmbededEtcdKV creates a new etcd kv.
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func NewEmbededEtcdKV(cfg *embed.Config, rootPath string, options ...Option) (*EmbedEtcdKV, error) {
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var e *embed.Etcd
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var err error
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err = retry(defaultRetryCount, defaultRetryInterval, func() error {
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e, err = embed.StartEtcd(cfg)
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return err
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})
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if err != nil {
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return nil, err
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}
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client := v3client.New(e.Server)
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opt := defaultOption()
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for _, option := range options {
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option(opt)
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}
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kv := &EmbedEtcdKV{
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client: client,
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rootPath: rootPath,
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etcd: e,
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requestTimeout: opt.requestTimeout,
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}
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// wait until embed etcd is ready with retry mechanism
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err = retry(defaultRetryCount, defaultRetryInterval, func() error {
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select {
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case <-e.Server.ReadyNotify():
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log.Info("Embedded etcd is ready!")
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return nil
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case <-time.After(60 * time.Second):
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e.Server.Stop() // trigger a shutdown
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return errors.New("Embedded etcd took too long to start")
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}
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})
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if err != nil {
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return nil, err
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}
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return kv, nil
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}
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// Close closes the embedded etcd
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func (kv *EmbedEtcdKV) Close() {
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kv.closeOnce.Do(func() {
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kv.client.Close()
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kv.etcd.Close()
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})
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}
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// GetPath returns the full path by given key
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func (kv *EmbedEtcdKV) GetPath(key string) string {
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return path.Join(kv.rootPath, key)
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}
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func (kv *EmbedEtcdKV) WalkWithPrefix(prefix string, paginationSize int, fn func([]byte, []byte) error) error {
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prefix = path.Join(kv.rootPath, prefix)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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batch := int64(paginationSize)
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opts := []clientv3.OpOption{
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend),
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clientv3.WithLimit(batch),
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clientv3.WithRange(clientv3.GetPrefixRangeEnd(prefix)),
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}
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key := prefix
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for {
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resp, err := kv.client.Get(ctx, key, opts...)
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if err != nil {
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return err
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}
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for _, kv := range resp.Kvs {
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if err = fn(kv.Key, kv.Value); err != nil {
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return err
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}
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}
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if !resp.More {
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break
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}
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// move to next key
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key = string(append(resp.Kvs[len(resp.Kvs)-1].Key, 0))
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}
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return nil
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}
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// LoadWithPrefix returns all the keys and values with the given key prefix
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func (kv *EmbedEtcdKV) LoadWithPrefix(key string) ([]string, []string, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([]string, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, string(kv.Value))
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}
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return keys, values, nil
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}
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func (kv *EmbedEtcdKV) Has(key string) (bool, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("Has", zap.String("key", key))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithCountOnly())
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if err != nil {
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return false, err
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}
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return resp.Count != 0, nil
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}
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func (kv *EmbedEtcdKV) HasPrefix(prefix string) (bool, error) {
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prefix = path.Join(kv.rootPath, prefix)
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log.Debug("HasPrefix", zap.String("prefix", prefix))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, prefix, clientv3.WithPrefix(), clientv3.WithCountOnly(), clientv3.WithLimit(1))
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if err != nil {
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return false, err
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}
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return resp.Count != 0, nil
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}
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// LoadBytesWithPrefix returns all the keys and values with the given key prefix
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func (kv *EmbedEtcdKV) LoadBytesWithPrefix(key string) ([]string, [][]byte, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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}
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return keys, values, nil
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}
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// LoadBytesWithPrefix2 returns all the keys and values with versions by the given key prefix
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func (kv *EmbedEtcdKV) LoadBytesWithPrefix2(key string) ([]string, [][]byte, []int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithPrefix2 ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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versions := make([]int64, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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versions = append(versions, kv.Version)
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}
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return keys, values, versions, nil
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}
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// Load returns value of the given key
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func (kv *EmbedEtcdKV) Load(key string) (string, error) {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key)
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if err != nil {
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return "", err
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}
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if resp.Count <= 0 {
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return "", merr.WrapErrIoKeyNotFound(key)
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}
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return string(resp.Kvs[0].Value), nil
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}
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// LoadBytes returns value of the given key
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func (kv *EmbedEtcdKV) LoadBytes(key string) ([]byte, error) {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key)
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if err != nil {
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return nil, err
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}
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if resp.Count <= 0 {
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return nil, merr.WrapErrIoKeyNotFound(key)
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}
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return resp.Kvs[0].Value, nil
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}
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// MultiLoad returns values of a set of keys
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func (kv *EmbedEtcdKV) MultiLoad(keys []string) ([]string, error) {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, keyLoad := range keys {
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ops = append(ops, clientv3.OpGet(path.Join(kv.rootPath, keyLoad)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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if err != nil {
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return nil, err
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}
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result := make([]string, 0, len(keys))
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invalid := make([]string, 0, len(keys))
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for index, rp := range resp.Responses {
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if rp.GetResponseRange().Kvs == nil || len(rp.GetResponseRange().Kvs) == 0 {
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invalid = append(invalid, keys[index])
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result = append(result, "")
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}
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for _, ev := range rp.GetResponseRange().Kvs {
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log.Debug("MultiLoad", zap.ByteString("key", ev.Key),
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zap.ByteString("value", ev.Value))
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result = append(result, string(ev.Value))
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}
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}
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if len(invalid) != 0 {
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log.Debug("MultiLoad: there are invalid keys",
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zap.Strings("keys", invalid))
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err = fmt.Errorf("there are invalid keys: %s", invalid)
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return result, err
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}
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return result, nil
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}
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// MultiLoadBytes returns values of a set of keys
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func (kv *EmbedEtcdKV) MultiLoadBytes(keys []string) ([][]byte, error) {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, keyLoad := range keys {
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ops = append(ops, clientv3.OpGet(path.Join(kv.rootPath, keyLoad)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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if err != nil {
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return nil, err
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}
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result := make([][]byte, 0, len(keys))
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invalid := make([]string, 0, len(keys))
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for index, rp := range resp.Responses {
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if rp.GetResponseRange().Kvs == nil || len(rp.GetResponseRange().Kvs) == 0 {
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invalid = append(invalid, keys[index])
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result = append(result, []byte{})
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}
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for _, ev := range rp.GetResponseRange().Kvs {
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log.Debug("MultiLoadBytes", zap.ByteString("key", ev.Key),
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zap.ByteString("value", ev.Value))
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result = append(result, ev.Value)
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}
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}
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if len(invalid) != 0 {
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log.Debug("MultiLoadBytes: there are invalid keys",
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zap.Strings("keys", invalid))
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err = fmt.Errorf("there are invalid keys: %s", invalid)
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return result, err
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}
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return result, nil
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}
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// LoadBytesWithRevision returns keys, values and revision with given key prefix.
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func (kv *EmbedEtcdKV) LoadBytesWithRevision(key string) ([]string, [][]byte, int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithRevision ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, 0, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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}
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return keys, values, resp.Header.Revision, nil
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}
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// Save saves the key-value pair.
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func (kv *EmbedEtcdKV) Save(key, value string) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, value)
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return err
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}
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// SaveBytes saves the key-value pair.
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func (kv *EmbedEtcdKV) SaveBytes(key string, value []byte) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, string(value))
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return err
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}
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// SaveBytesWithLease is a function to put value in etcd with etcd lease options.
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func (kv *EmbedEtcdKV) SaveBytesWithLease(key string, value []byte, id clientv3.LeaseID) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, string(value), clientv3.WithLease(id))
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return err
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}
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// MultiSave saves the key-value pairs in a transaction.
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func (kv *EmbedEtcdKV) MultiSave(kvs map[string]string) error {
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ops := make([]clientv3.Op, 0, len(kvs))
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for key, value := range kvs {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// MultiSaveBytes saves the key-value pairs in a transaction.
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func (kv *EmbedEtcdKV) MultiSaveBytes(kvs map[string][]byte) error {
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ops := make([]clientv3.Op, 0, len(kvs))
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for key, value := range kvs {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// RemoveWithPrefix removes the keys with given prefix.
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func (kv *EmbedEtcdKV) RemoveWithPrefix(prefix string) error {
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key := path.Join(kv.rootPath, prefix)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Delete(ctx, key, clientv3.WithPrefix())
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return err
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}
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// Remove removes the key.
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func (kv *EmbedEtcdKV) Remove(key string) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Delete(ctx, key)
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return err
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}
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// MultiRemove removes the keys in a transaction.
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func (kv *EmbedEtcdKV) MultiRemove(keys []string) error {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, key := range keys {
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ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, key)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// MultiSaveAndRemove saves the key-value pairs and removes the keys in a transaction.
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func (kv *EmbedEtcdKV) MultiSaveAndRemove(saves map[string]string, removals []string, preds ...predicates.Predicate) error {
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cmps, err := parsePredicates(kv.rootPath, preds...)
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if err != nil {
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return err
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}
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ops := make([]clientv3.Op, 0, len(saves)+len(removals))
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for key, value := range saves {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
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}
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for _, keyDelete := range removals {
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ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
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defer cancel()
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resp, err := kv.client.Txn(ctx).If(cmps...).Then(ops...).Commit()
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if err != nil {
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return err
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}
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|
if !resp.Succeeded {
|
|
return merr.WrapErrIoFailedReason("failed to execute transaction")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MultiSaveBytesAndRemove saves the key-value pairs and removes the keys in a transaction.
|
|
func (kv *EmbedEtcdKV) MultiSaveBytesAndRemove(saves map[string][]byte, removals []string) error {
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete)))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) Watch(key string) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithCreatedNotify())
|
|
return rch
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) WatchWithPrefix(key string) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithCreatedNotify())
|
|
return rch
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) WatchWithRevision(key string, revision int64) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithPrevKV(), clientv3.WithRev(revision))
|
|
return rch
|
|
}
|
|
|
|
// MultiSaveAndRemoveWithPrefix saves kv in @saves and removes the keys with given prefix in @removals.
|
|
func (kv *EmbedEtcdKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string, preds ...predicates.Predicate) error {
|
|
cmps, err := parsePredicates(kv.rootPath, preds...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete), clientv3.WithPrefix()))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
|
|
defer cancel()
|
|
|
|
resp, err := kv.client.Txn(ctx).If(cmps...).Then(ops...).Commit()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !resp.Succeeded {
|
|
return merr.WrapErrIoFailedReason("failed to execute transaction")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MultiSaveBytesAndRemoveWithPrefix saves kv in @saves and removes the keys with given prefix in @removals.
|
|
func (kv *EmbedEtcdKV) MultiSaveBytesAndRemoveWithPrefix(saves map[string][]byte, removals []string) error {
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete), clientv3.WithPrefix()))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
// CompareVersionAndSwap compares the existing key-value's version with version, and if
|
|
// they are equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareVersionAndSwap(key string, version int64, target string) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Version(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
version)).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), target)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
// CompareVersionAndSwapBytes compares the existing key-value's version with version, and if
|
|
// they are equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareVersionAndSwapBytes(key string, version int64, target []byte, opts ...clientv3.OpOption) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), kv.requestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Version(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
version)).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), string(target), opts...)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) GetConfig() embed.Config {
|
|
return kv.etcd.Config()
|
|
}
|