- path约定
- /topic/partitionNo/fileName
- partitionNo必须是数字
- 文件大小小于10兆
FileSystem支持api
增：
public FSDataOutputStream create(Path f) throws IOException 删：删除目录只支持topic级别，不支持partition级别删除
/** Delete a file.
*
* @param f the path to delete.
* @param recursive if path is a directory and set to
* true, the directory is deleted else throws an exception. In
* case of a file the recursive can be set to either true or false.
* @return true if delete is successful else false.
* @throws IOException
*/
public abstract boolean delete(Path f, boolean recursive) throws IOException;改：不支持文件内容修改，仅支持重命名，且src和dst只能是相同主题和相同分区，path只能是文件
/**
* Renames Path src to Path dst. Can take place on local fs
* or remote DFS.
* @param src path to be renamed
* @param dst new path after rename
* @throws IOException on failure
* @return true if rename is successful
*/
public abstract boolean rename(Path src, Path dst) throws IOException;读取文件：
/**
* Opens an FSDataInputStream at the indicated Path.
* @param f the file name to open
* @param bufferSize the size of the buffer to be used.
*/
public abstract FSDataInputStream open(Path f, int bufferSize)
throws IOException;