UploadSession接口怎么定义

UploadSession接口定义 UploadSession接口定义如下。

public class UploadSession {
    UploadSession(Configuration conf, String projectName, String tableName,
                  String partitionSpec) throws TunnelException;
    UploadSession(Configuration conf, String projectName, String tableName, 
                  String partitionSpec, String uploadId) throws TunnelException;
    public void commit(Long[] blocks);
    public Long[] getBlockList();
    public String getId();
    public TableSchema getSchema();
    public UploadSession.Status getStatus();
    public Record newRecord();
    public RecordWriter openRecordWriter(long blockId);
    public RecordWriter openRecordWriter(long blockId, boolean compress);
    public RecordWriter openBufferedWriter();
    public RecordWriter openBufferedWriter(boolean compress);
}