Bug #34320
mgr/dashboard: Read/Write OPS in pool stats always show 0
0%
Description
In the dashboard 'Pools' widget the Read/Write ops are always 0. I assume the CephService::get_pool_list_with_stats method is doing something wrong.
Related issues
History
#1 Updated by Lenz Grimmer 4 months ago
- Category changed from dashboard/backend to python interface
- Assignee set to John Spray
@John, maybe something for you to take a look at?
#2 Updated by John Spray 4 months ago
- Assignee deleted (
John Spray)
The get_pool_list_with_stats implementation looks strange to me.
It seems to be trying to construct some deque time series in pool_stats, but pool_stats is a local that's construct each time the function is called. The later call to get_rate is probably always returning 0 because the length of the series is only ever 1.
Look at how update_pool_stats is used in the luminous dashboard -- it's called each time we get a pg_summary notification, and maintains the time series as an attribute of the MgrModule instance, so that it's always there when something else wants to read it.
#3 Updated by Volker Theile 4 months ago
- Assignee set to Ricardo Dias
#4 Updated by Lenz Grimmer 3 months ago
Just to elaborate on this a bit (thank you John for the clarification on IRC): this needs to be fixed in the Ceph Manager dashboard module backend:
The underlying ceph-mgr bits just give the current statistics (via the pgmap summary) -- the calculation of the rate would happen in the dashboard
#5 Updated by Lenz Grimmer 3 months ago
- Category changed from python interface to dashboard/backend
#6 Updated by Lenz Grimmer about 1 month ago
- Related to Bug #36740: mgr/dashboard: PG Stats, Pool usage and read/write ops missing from Pools table added
#7 Updated by Lenz Grimmer about 1 month ago
- Status changed from New to Won't Fix
#8 Updated by Lenz Grimmer about 1 month ago
- Related to Feature #36675: mgr/dashboard: Provide API endpoint providing minimal health data added