search

Kaperstone / mogilefs

Automatically exported from code.google.com/p/mogilefs
0 stars 0 forks source link

device table UPDATE's are too frequent #59

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
Filing this for Pyry so I can stop thinking about it for now :P

Each tracker updates each device row once every 15 seconds, even if it hasn't 
really changed, so mb_asof can be updated.

This ends up being another pain point of scaling the tracker count, as each are 
doing their own thing.

A quick patch would be to only update if mb_asof from the most recent read is 
over 15 seconds old.

An even better one might involve a lock from the tracker. Monitor worker grabs 
exclusive lock for updating 'device' rows, then updates any over 15 seconds 
old. That stops trackers from selecting from device at the same time then 
co-updating all of the rows.

Original issue reported on code.google.com by dorma...@rydia.net on 28 Feb 2012 at 2:48

GoogleCodeExporter commented 8 years ago 
I fixed this already.

Original comment by dorma...@rydia.net on 29 Feb 2012 at 7:03