RedoLogChunk(int id, Map<String, String> config) {
this.id = id;
// 不使用ObjectDataType，因为ObjectDataType需要自动侦测，会有一些开销
this.keyType = new RedoLogKeyType();
this.valueType = new RedoLogValueType();
skipListMap = new ConcurrentSkipListMap<>(new KeyComparator<Long>(keyType));
String chunkFileName = getChunkFileName(config, id);
fileStorage = new FileStorage();
fileStorage.open(chunkFileName, config);
pos = fileStorage.size();
if (pos > 0) read();
}
