seaweedfs/weed/storage/erasure_coding/ec_volume_test.go

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package erasure_coding
import (
"fmt"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/storage/types"
)
func TestPositioning(t *testing.T) {
ecxFile, err := os.OpenFile("389.ecx", os.O_RDONLY, 0)
if err != nil {
t.Errorf("failed to open ecx file: %v", err)
}
defer ecxFile.Close()
stat, _ := ecxFile.Stat()
fileSize := stat.Size()
tests := []struct {
needleId string
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offset int64
size int
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}{
{needleId: "0f0edb92", offset: 31300679656, size: 1167},
{needleId: "0ef7d7f8", offset: 11513014944, size: 66044},
}
for _, test := range tests {
needleId, _ := types.ParseNeedleId(test.needleId)
offset, size, err := SearchNeedleFromSortedIndex(ecxFile, fileSize, needleId, nil)
assert.Equal(t, nil, err, "SearchNeedleFromSortedIndex")
fmt.Printf("offset: %d size: %d\n", offset.ToAcutalOffset(), size)
}
needleId, _ := types.ParseNeedleId("0f087622")
offset, size, err := SearchNeedleFromSortedIndex(ecxFile, fileSize, needleId, nil)
assert.Equal(t, nil, err, "SearchNeedleFromSortedIndex")
fmt.Printf("offset: %d size: %d\n", offset.ToAcutalOffset(), size)
var shardEcdFileSize int64 = 1118830592 // 1024*1024*1024*3
intervals := LocateData(ErasureCodingLargeBlockSize, ErasureCodingSmallBlockSize, DataShardsCount*shardEcdFileSize, offset.ToAcutalOffset(), uint32(needle.GetActualSize(size, needle.CurrentVersion)))
for _, interval := range intervals {
shardId, shardOffset := interval.ToShardIdAndOffset(ErasureCodingLargeBlockSize, ErasureCodingSmallBlockSize)
fmt.Printf("interval: %+v, shardId: %d, shardOffset: %d\n", interval, shardId, shardOffset)
}
}