Thanks Eli, I got it now.
On Fri, Nov 5, 2010 at 10:36 PM, Eli Collins <e...@cloudera.com> wrote: > Hey Thanh, > > Data gets written in 64KB packets so there doesn't seem to be a need > to buffer it. > > Thanks, > Eli > > On Thu, Nov 4, 2010 at 2:58 PM, Thanh Do <than...@cs.wisc.edu> wrote: > > Hi all, > > > > When a datanode receive a block, the datanode > > write the block into 2 streams on disk: > > - the data stream (dataOut) > > - the checksum stream (checksumOut) > > > > While the checksumOut is created with following code: > > this.checksumOut = new DataOutputStream(new BufferedOutputStream( > > streams.checksumOut, > > SMALL_BUFFER_SIZE)); > > The dataOut is simply FileOutputStream() > > > > So, the checksumOut is buffered, but dataOut is not. > > > > Is there any particular reason for doing so? > > or it doesn't matter, because after that, we flush > > the two streams anyway? > > > > Thanks > > Thanh > > >
