[Node Manager] Investigate and try to address RAM use
Node Manager uses ~1GiB of RAM on our production clusters. Investigate why it's so large, and try to bring it down.
When I run it on my desktop in local testing mode with the dummy driver, it takes ~200MiB. This makes me think apache-libcloud's EC2 driver is responsible for a good chunk of this. But that's just a theory that needs proving.
#1 Updated by Brett Smith about 3 years ago
Another idea that occurred to me: arvnodeman.computenode.ec2 loads information about node sizes, images, security groups, etc. by listing them all and finding the one with the matching name. It shouldn't be holding on to the full list, but maybe the underlying ec2 driver is caching it, or maybe it's just hanging around without being garbage collected.
This approach is illustrated in the apache-libcloud tutorials (literally on the project's front page), so I figured it was best, but I didn't investigate very deeply. If there's a way to look up these items directly by their ID, that might make a noticeable dent on RAM use.