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Zookeeper >> mail # dev >> Recording time taken for disk IO

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Recording time taken for disk IO

I was wondering if there is a way to measure the disk IO latency at ZK
server for reads/writes performed to the  transaction log and snapshots.  In
case ZK
is experiencing higher transaction latencies it would be useful to
verify whether it is due to disk or network.

We need to add this for debugging our application since we do not have
 ZK logs on dedicated disks.  If the disk IO is not currently monitored, I
was thinking of extending the streams used in FiLeSnap.java and
FileTxnLog.java, and measure the time taken to do the IO.
Does this sound like a good place to measure the latency?
Will it  useful to have this in the tree?