Please look at dfs.heartbeat.interval and dfs.namenode.heartbeat.recheck-interval
40 datanodes is not a large cluster IMHO and the Namenode is capable of managing 100 times more datanodes.
From: Rita <[EMAIL PROTECTED]>
To: "<[EMAIL PROTECTED]>" <[EMAIL PROTECTED]>
Sent: Sunday, October 6, 2013 9:49 AM
Subject: datanode tuning
I would like my 40 data nodes to aggressively report to namenode if they
are alive or not therefore I think I need to change these params
dfs.block.access.token.lifetime : Default is 600 seconds. Can I decrease
this to 60?
dfs.block.access.key.update.interval: Default is 600 seconds. Can I
decrease this to 60?
Also, what are some other turnings people do for datanodes in a relatively
--- Get your facts first, then you can distort them as you please.--