/
shards.go
43 lines (39 loc) · 1.1 KB
/
shards.go
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// Copyright 2023 StreamNative, 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 common
import (
"math"
)
type Shard struct {
Id int64
Min uint32
Max uint32
}
func GenerateShards(baseId int64, numShards uint32) []Shard {
shards := make([]Shard, 0)
bucketSize := (math.MaxUint32 / numShards) + 1
for i := uint32(0); i < numShards; i++ {
lowerBound := i * bucketSize
upperBound := lowerBound + bucketSize - 1
if i == numShards-1 {
upperBound = math.MaxUint32
}
shards = append(shards, Shard{
Id: baseId + int64(i),
Min: lowerBound,
Max: upperBound,
})
}
return shards
}