Bug #21538: upmap does not respect osd reweights - Ceph - Ceph

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Bug #21538

closed

upmap does not respect osd reweights

Added by Theofilos Mouratidis over 6 years ago. Updated over 6 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Category:

OSDMap

Target version:

% Done:

Source:

Community (dev)

Tags:

Backport:

luminous

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

v12.2.0

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

upmap currently ignores reweighted osds. In other words, out osds, or those with some fractional reweight, get items upmapped to them, which is counter productive when trying to balance OSDs.
In particular, out OSDs will continually get PGs upmapped to them since they have 0 PGs by design.

To demonstrate we added a --mark-out option to osdmaptool, add a new upmap-out test, and fix the problem in OSDMap::calc_pg_upmaps.

Bug and fix here: https://github.com/ceph/ceph/pull/17944

Related issues 1 (0 open — 1 closed)