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https://gitee.com/milvus-io/milvus.git
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ae072b4f1d
* Add candidate management for datacoord dn cluster Signed-off-by: Congqi Xia <congqi.xia@zilliz.com> * Fix test cases Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package datacoord
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import (
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"context"
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"errors"
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"sync"
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"github.com/milvus-io/milvus/internal/types"
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)
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type sessionManager interface {
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// try get session, without retry
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getSession(addr string) (types.DataNode, error)
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// try get session from manager with addr, if not exists, create one
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getOrCreateSession(addr string) (types.DataNode, error)
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releaseSession(addr string)
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release()
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}
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type clusterSessionManager struct {
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sync.RWMutex
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ctx context.Context
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sessions map[string]types.DataNode
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dataClientCreator dataNodeCreatorFunc
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}
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func newClusterSessionManager(ctx context.Context, dataClientCreator dataNodeCreatorFunc) *clusterSessionManager {
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return &clusterSessionManager{
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ctx: ctx,
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sessions: make(map[string]types.DataNode),
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dataClientCreator: dataClientCreator,
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}
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}
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// getSession with out creation if not found
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func (m *clusterSessionManager) getSession(addr string) (types.DataNode, error) {
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m.RLock()
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defer m.RUnlock()
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cli, has := m.sessions[addr]
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if has {
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return cli, nil
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}
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return nil, errors.New("not found")
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}
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func (m *clusterSessionManager) createSession(addr string) (types.DataNode, error) {
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cli, err := m.dataClientCreator(m.ctx, addr)
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if err != nil {
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return nil, err
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}
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if err := cli.Init(); err != nil {
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return nil, err
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}
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if err := cli.Start(); err != nil {
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return nil, err
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}
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m.Lock()
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m.sessions[addr] = cli
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m.Unlock()
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return cli, nil
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}
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// entry function
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func (m *clusterSessionManager) getOrCreateSession(addr string) (types.DataNode, error) {
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m.RLock()
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dn, has := m.sessions[addr]
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m.RUnlock()
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if has {
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return dn, nil
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}
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// does not need double check, addr has outer sync.Map
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dn, err := m.createSession(addr)
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return dn, err
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}
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// // lock acquired
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// func (m *clusterSessionManager) hasSession(addr string) bool {
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// _, ok := m.sessions[addr]
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// return ok
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// }
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func (m *clusterSessionManager) releaseSession(addr string) {
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m.Lock()
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defer m.Unlock()
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cli, ok := m.sessions[addr]
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if !ok {
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return
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}
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_ = cli.Stop()
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delete(m.sessions, addr)
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}
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func (m *clusterSessionManager) release() {
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m.Lock()
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defer m.Unlock()
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for _, cli := range m.sessions {
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_ = cli.Stop()
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}
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m.sessions = map[string]types.DataNode{}
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}
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