Bug #21897
Updated by Vikhyat Umrao over 6 years ago
- OSD heartbeat timeout due to too many omap entries read in each 'chunk' being backfilled (edit)
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 users 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.