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From Steve Loughran <>
Subject Re: [jira] [Commented] (HAMA-363) Add network condition monitoring function to BSPMaster
Date Tue, 10 May 2011 10:44:44 GMT
On 09/05/11 22:02, Thomas Jungblut (JIRA) wrote:
>      [
> Thomas Jungblut commented on HAMA-363:
> --------------------------------------
> As far as I know Hadoop only provides some JVM metrics and host metrices. I don't exactly
find the correct source code position, but I think we should implement our own metrics package,
which we can later add to ganglia. This is much more useful.
> We should define things we need to determine whether there are problems or not.
> Something like: "We ping every groom every 5 seconds and check the latency."
> This can be easily implemented in BSPMaster.
> To measure the IN and OUT rate or other fancy stuff we need something like heartbeat
communication that will transfer the local groom data to the master.
> This should be in the newer versions of Hadoop>0.21 shouldn't it? Don't have the source
codes haging around here.

if you are doing perf stuff, I'd go for having some plugin monitoring 
that can go in before/after communications.

Why? I'm playing with sFlow monitoring of bits of Hadoop, and it's 
tricky to retrofit this stuff deep into the code. If the hooks where 
there it's easier.

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