I think my question is ignored, so just post it again: I am a bit confused of how this attribute is used.
My understanding is it's related with file read/write. And I can see, in LineReader.java, it's used as the default buffer size for each line; in BlockReader.newBlockReader(), it's used as the internal buffer size of the BufferedInputStream. Also, in compression related classes, it's used as default buffer size. However, when creating a file (write), bufferSize is not seemed to be used at all. E.g. DFSClient.DFSOutputStream( String src, int buffersize, Progressable progress, LocatedBlock lastBlock, FileStatus stat,int bytesPerChecksum); it has a buffersize param, but never used in its definition. In other words, it's not used for writing at all? Is this right?
