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« Digg Architecture | Main | Art of scalability (1) - Scalability principles »
Friday
Apr032009

Collectl interface to Ganglia - any interest?

It's been awhile since I've said anything about collectl and I wanted to let this group know I'm currently working on an interface to ganglia since I've seen a variety of posts ranging from how much data to log and where to log it as well as which tools/mechanism to use for logging. From my perspective there are essentially 2 camps on the monitoring front - one says to have distributed agents all sending their data to a central point, but don't send too much or too often. The other camp (which is the one I'm in) says do it all locally with a highly efficient data collector, because you need a lot of data (I also read a post in here about logging everything) and you can't possibly monitors 100s or 1Ks of nodes remotely at the granularity necessary to get anything meaningful.

Enter collectl and its evolving interface for ganglia. This will allow you to log lots of detailed data on local nodes at the usual 10 sec interval (or more frequent if you prefer) at about 0.1% system overhead while sending a subset at a lower rate to the ganglia gmonds. This would give you the best of both worlds but I don't know if people are too married to the centralized concept to try something different.

I don't know how many people who follow this forum have actually tried it, I know at least a few of you have, but to learn more just go to http://collectl.sourceforge.net/ and look at some of documentation or just download the rpm and type 'collectl'.

-mark

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