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query_executor.go
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query_executor.go
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// Copyright 2014-2021 Aerospike, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package aerospike
import (
"context"
"sync"
"time"
"github.com/aerospike/aerospike-client-go/logger"
"golang.org/x/sync/semaphore"
)
func (clnt *Client) queryPartitions(policy *QueryPolicy, tracker *partitionTracker, statement *Statement, rs *Recordset) error {
defer rs.signalEnd()
// for exponential backoff
interval := policy.SleepBetweenRetries
for {
rs.resetTaskID()
list, err := tracker.assignPartitionsToNodes(clnt.Cluster(), statement.Namespace)
if err != nil {
return err
}
wg := new(sync.WaitGroup)
// the whole call should be wrapped in a goroutine
wg.Add(len(list))
// results channel must be async for performance
maxConcurrentNodes := policy.MaxConcurrentNodes
if maxConcurrentNodes <= 0 {
maxConcurrentNodes = len(list)
}
sem := semaphore.NewWeighted(int64(maxConcurrentNodes))
ctx := context.Background()
for _, nodePartition := range list {
if err = sem.Acquire(ctx, 1); err != nil {
logger.Logger.Error("Constraint Semaphore failed for Query: %s", err.Error())
}
go func(nodePartition *nodePartitions) {
defer sem.Release(1)
defer wg.Done()
if err := clnt.queryNodePartition(policy, rs, tracker, nodePartition, statement); err != nil {
logger.Logger.Debug("Error while Executing query for node %s: %s", nodePartition.node.String(), err.Error())
}
}(nodePartition)
}
wg.Wait()
done, err := tracker.isComplete(&policy.BasePolicy)
if done || err != nil {
// Query is complete.
return err
}
if policy.SleepBetweenRetries > 0 {
// Sleep before trying again.
time.Sleep(interval)
if policy.SleepMultiplier > 1 {
interval = time.Duration(float64(interval) * policy.SleepMultiplier)
}
}
}
}
// QueryNode reads all records in specified namespace and set for one node only.
// If the policy is nil, the default relevant policy will be used.
func (clnt *Client) queryNodePartition(policy *QueryPolicy, recordset *Recordset, tracker *partitionTracker, nodePartition *nodePartitions, statement *Statement) error {
command := newQueryPartitionCommand(policy, tracker, nodePartition, statement, recordset)
return command.Execute()
}