Hi Fatemeh, The hearbeart is by default sent every 3 seconds. For network overhead, you may need some tracing tool. I often run hdfs in local machine and use dtrace/systemtap to see the io activity.
On Mon, Nov 15, 2010 at 3:26 PM, Fatemeh Panahi <fate...@cs.wisc.edu> wrote: > Hello > > I am not sure where to find the answers to questions such as below. Any > pointer or answer would be appreciated. > > I would like to know some details such as how many heartbeats are sent per > second to the name node in a "typical" configuration (I understand that > these parameters might be configurable) > > Also, I would like to know how much overhead in terms of network traffic do > the HDFS protocol messages typically have? (i.e. heartbeat and block report > messages) > > I understand that exact answers might not be possible but I want to get a > feeling about the above. For example, is the protocol overhead a lot or > negligible in contrast with all the data that is moving around. > > Thank you in advance for your time. > > Fatemah >
