Description of problem: OSD heartbeat timeout due to too many omap entries read in each 'chunk' being backfilled Version-Release number of selected component (if applicable): Red Hat Ceph Storage 2.4 How reproducible: Always in the scale lab Additional info: Testing in the scale lab uncovered an area where osds were hitting heartbeat timeouts during backfill. This turned out to be due to too many omap entries read in each 'chunk' being backfilled, and only resetting the heartbeat once an entire chunk was assembled. We should ask Athena to tune this down for their bucket index osds - setting: Max number of omap entries per chunk: osd_recovery_max_omap_entries_per_chunk = 1024 Josh is planning to add a patch for 3.0 and 2.5 to reset the heartbeat in middle of gathering a chunk, which should make the current default of 64000 entries per backfill chunk work even with large stores.
Moving this bug to verified state. Created objects with heavy omap entries around 50000 and start random osd failures not observed any issues. Default value of "osd_recovery_max_omap_entries_per_chunk": "8096"
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0474