/
controller_impl.go
486 lines (425 loc) · 14.7 KB
/
controller_impl.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package shard
import (
"context"
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
"go.opentelemetry.io/otel/trace"
"go.temporal.io/api/serviceerror"
"go.temporal.io/server/api/historyservice/v1"
"go.temporal.io/server/client"
"go.temporal.io/server/common"
"go.temporal.io/server/common/archiver"
"go.temporal.io/server/common/clock"
"go.temporal.io/server/common/cluster"
"go.temporal.io/server/common/convert"
"go.temporal.io/server/common/log"
"go.temporal.io/server/common/log/tag"
"go.temporal.io/server/common/membership"
"go.temporal.io/server/common/metrics"
"go.temporal.io/server/common/namespace"
"go.temporal.io/server/common/persistence"
"go.temporal.io/server/common/persistence/serialization"
"go.temporal.io/server/common/searchattribute"
serviceerrors "go.temporal.io/server/common/serviceerror"
"go.temporal.io/server/common/util"
"go.temporal.io/server/service/history/configs"
)
const (
shardControllerMembershipUpdateListenerName = "ShardController"
)
var (
invalidShardIdLowerBound = serviceerror.NewInvalidArgument("shard Id cannot be equal or lower than zero")
invalidShardIdUpperBound = serviceerror.NewInvalidArgument("shard Id cannot be larger than max shard count")
)
type (
ControllerImpl struct {
membershipUpdateCh chan *membership.ChangedEvent
engineFactory EngineFactory
status int32
shutdownWG sync.WaitGroup
shutdownCh chan struct{}
contextTaggedLogger log.Logger
throttledLogger log.Logger
config *configs.Config
sync.RWMutex
historyShards map[int32]*ContextImpl
logger log.Logger
persistenceExecutionManager persistence.ExecutionManager
persistenceShardManager persistence.ShardManager
clientBean client.Bean
historyClient historyservice.HistoryServiceClient
historyServiceResolver membership.ServiceResolver
taggedMetricsHandler metrics.Handler
metricsHandler metrics.Handler
payloadSerializer serialization.Serializer
timeSource clock.TimeSource
namespaceRegistry namespace.Registry
saProvider searchattribute.Provider
saMapperProvider searchattribute.MapperProvider
clusterMetadata cluster.Metadata
archivalMetadata archiver.ArchivalMetadata
hostInfoProvider membership.HostInfoProvider
tracer trace.Tracer
}
)
var _ Controller = (*ControllerImpl)(nil)
func (c *ControllerImpl) Start() {
if !atomic.CompareAndSwapInt32(
&c.status,
common.DaemonStatusInitialized,
common.DaemonStatusStarted,
) {
return
}
if c.engineFactory == nil {
panic("engineFactory was not injected")
}
hostIdentity := c.hostInfoProvider.HostInfo().Identity()
c.contextTaggedLogger = log.With(c.logger, tag.ComponentShardController, tag.Address(hostIdentity))
c.throttledLogger = log.With(c.throttledLogger, tag.ComponentShardController, tag.Address(hostIdentity))
c.acquireShards()
c.shutdownWG.Add(1)
go c.shardManagementPump()
if err := c.historyServiceResolver.AddListener(
shardControllerMembershipUpdateListenerName,
c.membershipUpdateCh,
); err != nil {
c.contextTaggedLogger.Error("Error adding listener", tag.Error(err))
}
c.contextTaggedLogger.Info("", tag.LifeCycleStarted)
}
func (c *ControllerImpl) Stop() {
if !atomic.CompareAndSwapInt32(
&c.status,
common.DaemonStatusStarted,
common.DaemonStatusStopped,
) {
return
}
close(c.shutdownCh)
if err := c.historyServiceResolver.RemoveListener(
shardControllerMembershipUpdateListenerName,
); err != nil {
c.contextTaggedLogger.Error("Error removing membership update listener", tag.Error(err), tag.OperationFailed)
}
if success := common.AwaitWaitGroup(&c.shutdownWG, time.Minute); !success {
c.contextTaggedLogger.Warn("", tag.LifeCycleStopTimedout)
}
c.contextTaggedLogger.Info("", tag.LifeCycleStopped)
}
func (c *ControllerImpl) GetPingChecks() []common.PingCheck {
return []common.PingCheck{{
Name: "shard controller",
Timeout: 10 * time.Second,
Ping: func() []common.Pingable {
// we only need to read but get write lock to make sure we can
c.Lock()
defer c.Unlock()
out := make([]common.Pingable, 0, len(c.historyShards))
for _, shard := range c.historyShards {
out = append(out, shard)
}
return out
},
MetricsName: metrics.ShardControllerLockLatency.GetMetricName(),
}}
}
func (c *ControllerImpl) Status() int32 {
return atomic.LoadInt32(&c.status)
}
// GetShardByID returns a shard context for the given namespace and workflow.
// The shard context may not have acquired a rangeid lease yet.
// Callers can use GetEngine on the shard to block on rangeid lease acquisition.
func (c *ControllerImpl) GetShardByNamespaceWorkflow(
namespaceID namespace.ID,
workflowID string,
) (Context, error) {
shardID := c.config.GetShardID(namespaceID, workflowID)
return c.GetShardByID(shardID)
}
// GetShardByID returns a shard context for the given shard id.
// The shard context may not have acquired a rangeid lease yet.
// Callers can use GetEngine on the shard to block on rangeid lease acquisition.
func (c *ControllerImpl) GetShardByID(
shardID int32,
) (Context, error) {
startTime := time.Now().UTC()
defer func() {
c.taggedMetricsHandler.Timer(metrics.GetEngineForShardLatency.GetMetricName()).Record(time.Since(startTime))
}()
return c.getOrCreateShardContext(shardID)
}
func (c *ControllerImpl) CloseShardByID(shardID int32) {
startTime := time.Now().UTC()
defer func() {
c.taggedMetricsHandler.Timer(metrics.RemoveEngineForShardLatency.GetMetricName()).Record(time.Since(startTime))
}()
shard, newNumShards := c.removeShard(shardID, nil)
// Stop the current shard, if it exists.
if shard != nil {
shard.contextTaggedLogger.Info("", tag.LifeCycleStopping, tag.ComponentShardContext, tag.ShardID(shardID))
shard.finishStop()
c.taggedMetricsHandler.Counter(metrics.ShardContextRemovedCounter.GetMetricName()).Record(1)
shard.contextTaggedLogger.Info("", tag.LifeCycleStopped, tag.ComponentShardContext, tag.Number(newNumShards))
}
}
func (c *ControllerImpl) ShardIDs() []int32 {
c.RLock()
defer c.RUnlock()
ids := make([]int32, 0, len(c.historyShards))
for id := range c.historyShards {
ids = append(ids, id)
}
return ids
}
func (c *ControllerImpl) shardClosedCallback(shard *ContextImpl) {
startTime := time.Now().UTC()
defer func() {
c.taggedMetricsHandler.Timer(metrics.RemoveEngineForShardLatency.GetMetricName()).Record(time.Since(startTime))
}()
c.taggedMetricsHandler.Counter(metrics.ShardContextClosedCounter.GetMetricName()).Record(1)
_, newNumShards := c.removeShard(shard.shardID, shard)
// Whether shard was in the shards map or not, in both cases we should stop it.
shard.contextTaggedLogger.Info("", tag.LifeCycleStopping, tag.ComponentShardContext, tag.ShardID(shard.shardID))
shard.finishStop()
c.taggedMetricsHandler.Counter(metrics.ShardContextRemovedCounter.GetMetricName()).Record(1)
shard.contextTaggedLogger.Info("", tag.LifeCycleStopped, tag.ComponentShardContext, tag.Number(newNumShards))
}
// getOrCreateShardContext returns a shard context for the given shard ID, creating a new one
// if necessary. If a shard context is created, it will initialize in the background.
// This function won't block on rangeid lease acquisition.
func (c *ControllerImpl) getOrCreateShardContext(shardID int32) (*ContextImpl, error) {
err := c.validateShardId(shardID)
if err != nil {
return nil, err
}
c.RLock()
if shard, ok := c.historyShards[shardID]; ok {
if shard.isValid() {
c.RUnlock()
return shard, nil
}
// if shard not valid then proceed to create a new one
}
c.RUnlock()
ownerInfo, err := c.historyServiceResolver.Lookup(convert.Int32ToString(shardID))
if err != nil {
return nil, err
}
hostInfo := c.hostInfoProvider.HostInfo()
if ownerInfo.Identity() != hostInfo.Identity() {
return nil, serviceerrors.NewShardOwnershipLost(ownerInfo.Identity(), hostInfo.GetAddress())
}
c.Lock()
defer c.Unlock()
// Check again with exclusive lock
if shard, ok := c.historyShards[shardID]; ok {
if shard.isValid() {
return shard, nil
}
shard.Unload()
delete(c.historyShards, shardID)
}
if atomic.LoadInt32(&c.status) == common.DaemonStatusStopped {
return nil, fmt.Errorf("ControllerImpl for host '%v' shutting down", hostInfo.Identity())
}
shard, err := newContext(
shardID,
c.engineFactory,
c.config,
c.shardClosedCallback,
c.logger,
c.throttledLogger,
c.persistenceExecutionManager,
c.persistenceShardManager,
c.clientBean,
c.historyClient,
c.metricsHandler,
c.payloadSerializer,
c.timeSource,
c.namespaceRegistry,
c.saProvider,
c.saMapperProvider,
c.clusterMetadata,
c.archivalMetadata,
c.hostInfoProvider,
)
if err != nil {
return nil, err
}
shard.start()
c.historyShards[shardID] = shard
c.taggedMetricsHandler.Counter(metrics.ShardContextCreatedCounter.GetMetricName()).Record(1)
shard.contextTaggedLogger.Info("", tag.LifeCycleStarted, tag.ComponentShardContext)
return shard, nil
}
func (c *ControllerImpl) removeShard(shardID int32, expected *ContextImpl) (*ContextImpl, int64) {
c.Lock()
defer c.Unlock()
nShards := int64(len(c.historyShards))
current, ok := c.historyShards[shardID]
if !ok {
return nil, nShards
}
if expected != nil && current != expected {
// the shard comparison is a defensive check to make sure we are deleting
// what we intend to delete.
return nil, nShards
}
delete(c.historyShards, shardID)
return current, nShards - 1
}
// shardManagementPump is the main event loop for
// ControllerImpl. It is responsible for acquiring /
// releasing shards in response to any event that can
// change the shard ownership. These events are
//
// a. Ring membership change
// b. Periodic ticker
// c. ShardOwnershipLostError and subsequent ShardClosedEvents from engine
func (c *ControllerImpl) shardManagementPump() {
defer c.shutdownWG.Done()
acquireTicker := time.NewTicker(c.config.AcquireShardInterval())
defer acquireTicker.Stop()
for {
select {
case <-c.shutdownCh:
c.doShutdown()
return
case <-acquireTicker.C:
c.acquireShards()
case changedEvent := <-c.membershipUpdateCh:
c.taggedMetricsHandler.Counter(metrics.MembershipChangedCounter.GetMetricName()).Record(1)
c.contextTaggedLogger.Info("", tag.ValueRingMembershipChangedEvent,
tag.NumberProcessed(len(changedEvent.HostsAdded)),
tag.NumberDeleted(len(changedEvent.HostsRemoved)),
)
c.acquireShards()
}
}
}
func (c *ControllerImpl) acquireShards() {
c.taggedMetricsHandler.Counter(metrics.AcquireShardsCounter.GetMetricName()).Record(1)
startTime := time.Now().UTC()
defer func() {
c.taggedMetricsHandler.Timer(metrics.AcquireShardsLatency.GetMetricName()).Record(time.Since(startTime))
}()
tryAcquire := func(shardID int32) {
info, err := c.historyServiceResolver.Lookup(convert.Int32ToString(shardID))
if err != nil {
c.contextTaggedLogger.Error("Error looking up host for shardID", tag.Error(err), tag.OperationFailed, tag.ShardID(shardID))
return
}
if info.Identity() != c.hostInfoProvider.HostInfo().Identity() {
// current host is not owner of shard, unload it if it is already loaded.
c.CloseShardByID(shardID)
return
}
shard, err := c.GetShardByID(shardID)
if err != nil {
c.taggedMetricsHandler.Counter(metrics.GetEngineForShardErrorCounter.GetMetricName()).Record(1)
c.contextTaggedLogger.Error("Unable to create history shard context", tag.Error(err), tag.OperationFailed, tag.ShardID(shardID))
return
}
// Wait up to 1s for the shard to acquire the rangeid lock.
// After 1s we will move on but the shard will continue trying in the background.
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
_, _ = shard.GetEngine(ctx)
ctx, cancel = context.WithTimeout(context.Background(), shardIOTimeout)
defer cancel()
// trust the AssertOwnership will handle shard ownership lost
_ = shard.AssertOwnership(ctx)
}
concurrency := util.Max(c.config.AcquireShardConcurrency(), 1)
shardActionCh := make(chan int32, c.config.NumberOfShards)
var wg sync.WaitGroup
wg.Add(concurrency)
// Spawn workers that would lookup and add/remove shards concurrently.
for i := 0; i < concurrency; i++ {
go func() {
defer wg.Done()
for shardID := range shardActionCh {
select {
case <-c.shutdownCh:
return
default:
tryAcquire(shardID)
}
}
}()
}
// Submit tasks to the channel.
numShards := c.config.NumberOfShards
randomStartOffset := rand.Int31n(numShards)
LoopSubmit:
for index := int32(0); index < numShards; index++ {
shardID := (index+randomStartOffset)%numShards + 1
select {
case <-c.shutdownCh:
break LoopSubmit
case shardActionCh <- shardID:
// noop
}
}
close(shardActionCh)
// Wait until all shards are processed.
wg.Wait()
c.RLock()
numOfOwnedShards := len(c.historyShards)
c.RUnlock()
c.taggedMetricsHandler.Gauge(metrics.NumShardsGauge.GetMetricName()).Record(float64(numOfOwnedShards))
}
func (c *ControllerImpl) doShutdown() {
c.contextTaggedLogger.Info("", tag.LifeCycleStopping)
c.Lock()
defer c.Unlock()
for _, shard := range c.historyShards {
shard.finishStop()
}
c.historyShards = nil
}
func (c *ControllerImpl) validateShardId(shardID int32) error {
if shardID <= 0 {
return invalidShardIdLowerBound
}
if shardID > c.config.NumberOfShards {
return invalidShardIdUpperBound
}
return nil
}
func IsShardOwnershipLostError(err error) bool {
switch err.(type) {
case *persistence.ShardOwnershipLostError:
return true
case *serviceerrors.ShardOwnershipLost:
return true
}
return false
}