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mergeSort.go
60 lines (56 loc) · 1.18 KB
/
mergeSort.go
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package reconEngine
import (
"bytes"
"os"
"sync"
)
// Merge sort algoritm (merge old partitions in bigger one)
func (ssTable *ssTable) MergeSort() error {
var mx sync.Mutex
mx.Lock()
defer mx.Unlock()
if ssTable.Len() <= 1 {
return nil
}
values := make(map[string][]byte)
ssTable.Range(func(createdAt int64, partitionStorage SsTablePartitionStorage) bool {
partitionStorage.Range(func(k string, v []byte) bool {
if _, ok := values[k]; !ok {
values[k] = v
}
return true
})
return true
})
ssp := ssTable.CreatePartition()
for k, v := range values {
if !bytes.Equal(v, []byte{removed}) {
err := ssp.Set(k, v)
if err != nil {
return err
}
}
}
err := ssTable.CloseAll()
if err != nil {
return err
} else {
for _, c := range ssTable.availablePartitions {
if c == ssp.Key() {
continue
}
err := os.Remove(makePath(*ssTable.dir, "partition", c))
if err != nil {
return err
}
err = os.Remove(makePath(*ssTable.dir, "index", c))
if err != nil {
return err
}
}
}
ssTable.availablePartitions = ssTablePartitionKeys{ssp.Key()}
ssTable.openedPartitions = make(ssTablePartitions, 0)
ssTable.CreatePartition()
return nil
}