Bug #34320
closed
mgr/dashboard: Read/Write OPS in pool stats always show 0
Added by Volker Theile over 5 years ago.
Updated about 3 years ago.
Category:
General - Back-end
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.
Files
- Category changed from 146 to python interface
- Assignee set to John Spray
@John, maybe something for you to take a look at?
- 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.
- Assignee set to Ricardo Dias
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
- Category changed from python interface to 146
- Related to Bug #36740: mgr/dashboard: PG Stats, Pool usage and read/write ops missing from Pools table added
- Status changed from New to Won't Fix
Resolving as "Won't fix", as the pools table has been removed when the new landing page was introduced with #35691.
We should revisit this when #36740 will be addressed.
- Related to Feature #36675: mgr/dashboard: Provide API endpoint providing minimal health data added
- Related to Bug #38284: mgr/dashboard: No I/O Stats shown in the pools list added
- Project changed from mgr to Dashboard
- Category changed from 146 to General - Back-end
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