• Requires at least go1.14 or newer.

make
cd bin

For example, if you have 1 LevelDB data and want to migrate it to 3 shardingdb data, print summary log(1), you can run the following command:

./resharding -i /data1 -o /newfolder1,/newfolder2,/newfolder3 -l 1

For example, if you have 1 LevelDB data and want to add 2 more LevelDB folders to shardingdb, print no log(0), you can run the following command:

```bash
./resharding -i /data1 -o /data1,/data2,/data3 

For example, if you have 3 LevelDB data and want to add 1 more LevelDB folder to shardingdb, print detail log(2), you can run the following command:

```bash
./resharding -i /data1,/data2,/data3 -o /data1,/data2,/data3,/data4 -l 2

go get github.com/studyzy/shardingdb

import "github.com/studyzy/shardingdb"

inputPathList := []string{"/data1", "/data2"}
sdb, err := shardingdb.OpenFile(inputPathList, nil)
sdb.Put([]byte("key"), []byte("value"), nil)
sdb.Get([]byte("key"), nil)
...

db1, err := leveldb.OpenFile(getTempDir(), nil)
if err != nil {
    t.Fatal(err)
}
db2, err := leveldb.OpenFile(getTempDir(), nil)
if err != nil {
    t.Fatal(err)
}
// Create a new sharding db
sdb, err := shardingdb.NewShardingDb(shardingdb.WithDbHandles(db1,db2), shardingdb.WithShardingFunc(MurmurSharding))
...

• Intel(R) Xeon(R) Platinum 8255C CPU @ 2.50GHz * 10 Core
• 40GB RAM
• 3 SSD: /data, /data1, /

generate data by command:

go test -timeout 60m -run "TestCompareDbPerformance"

Test case: total 1000000 key-value pairs, 100 go routines, 100 key-value pairs per batch. result means the time cost(second) of the whole operation.

run command:

go test  -timeout 60m -run "TestCompareShardingCountPerformance"

Most interfaces are the same as goleveldb. For my interface definition, please refer to DbHandle.