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scan_policy.go
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scan_policy.go
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// Copyright 2014-2022 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 (
"time"
kvs "github.com/aerospike/aerospike-client-go/v7/proto/kvs"
)
// ScanPolicy encapsulates parameters used in scan operations.
type ScanPolicy struct {
MultiPolicy
}
// NewScanPolicy creates a new ScanPolicy instance with default values.
// Set MaxRetries for scans on server versions >= 4.9. All other
// scans are not retried.
//
// The latest servers support retries on individual data partitions.
// This feature is useful when a cluster is migrating and partition(s)
// are missed or incomplete on the first scan attempt.
//
// If the first scan attempt misses 2 of 4096 partitions, then only
// those 2 partitions are retried in the next scan attempt from the
// last key digest received for each respective partition. A higher
// default MaxRetries is used because it's wasteful to invalidate
// all scan results because a single partition was missed.
func NewScanPolicy() *ScanPolicy {
mp := *NewMultiPolicy()
mp.TotalTimeout = 0
return &ScanPolicy{
MultiPolicy: mp,
}
}
func (sp *ScanPolicy) grpc() *kvs.ScanPolicy {
TotalTimeout := uint32(sp.TotalTimeout / time.Millisecond)
MaxRecords := uint64(sp.MaxRecords)
RecordsPerSecond := uint32(sp.RecordsPerSecond)
MaxConcurrentNodes := uint32(sp.MaxConcurrentNodes)
IncludeBinData := sp.IncludeBinData
ConcurrentNodes := MaxConcurrentNodes > 1
return &kvs.ScanPolicy{
Replica: sp.ReplicaPolicy.grpc(),
ReadModeAP: sp.ReadModeAP.grpc(),
ReadModeSC: sp.ReadModeSC.grpc(),
Compress: sp.UseCompression,
Expression: sp.FilterExpression.grpc(),
TotalTimeout: &TotalTimeout,
MaxRecords: &MaxRecords,
RecordsPerSecond: &RecordsPerSecond,
ConcurrentNodes: &ConcurrentNodes,
MaxConcurrentNodes: &MaxConcurrentNodes,
IncludeBinData: &IncludeBinData,
}
}