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Ceph Octopus (v15)

This document lists known critical bugs affecting Ceph Octopus (v15) releases.

PG Splitting/Merging Causes OSD Out-Of-Memory​

Severity: High
Affected Versions: 15.2.*
Bug Report: https://tracker.ceph.com/issues/53729

Description​

A bug in the PG splitting and merging code can cause the OSD to go out-of-memory, a condition which persists even after restart. Offline tools are available in fixed releases to workaround the issue.

Recommendation​

  • Do not change pg_num for any pool until after upgrade to a fixed release
  • Disable the pg autoscaler
  • Upgrade to Pacific v16.2.11+ or Quincy v17.2.4+