Tuesday, 3 June 2014

GSOC Week 2 : Bootstrapping

Based on recent discussions with my mentor KP, we've decided that instead of looking at the bigger picture of modifying multiple xlators, it's a better alternative to stick to the primary objectives of my proposal and start working on a 0.1 version of the application so as to present it soon in front of the Gluster community. Feedback is very important for our application since it's intended users will be the developers and Gluster users.

I've decided to go the python way for building glusterfsiostat. The further tasks needed to build this kind of thing are:
  1. Get location of every gluster mount in the system. This will be done with the help of the  mount command output by applying a bit of regex parsing. For now, I'll only be focusing on Unix based mount paths.
  2. Every glusterfs mount path contains a virtual directory called .meta which stores the meta information(name, type, structure of graph, latency) for every xlator. Reading the files in .meta will be my primary source of information. As of now, I could only find latency information for each of the 49 fops defined in Gluster, but in order to display total read/write amount and speed like the tool nfsiostat, I may need to modify the meta xlator itself.
  3. Pretty print this output with the application, or in a consumable form like JSON.
This initial version of the application might undergo many changes based on feedback from the community, and I'm ready for that because we're looking for a long haul!!

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