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From Fatemeh Panahi <fate...@cs.wisc.edu>
Subject Where to find HDFS details such as how many heartbeats per second?
Date Mon, 15 Nov 2010 21:26:23 GMT

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.


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