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Bug #39751

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nautilus: Number of objects in a pool doubled after pg merge

Added by Thore K almost 5 years ago. Updated almost 5 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
% Done:

0%

Source:
Tags:
Backport:
Regression:
No
Severity:
2 - major
Reviewed:
Affected Versions:
v14.2.1
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

After upgrading to nautilus and reducing the size of a pool (512 -> 128) the number of objects has almost exactly doubled. We observed a similar behaviour on another pool (32 -> 8 pgs).

The jumps visible in the attached images occur at the same time as the merge took place.

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ceph_vms_grow.png (66 KB) ceph_vms_grow.png Thore K, 05/14/2019 04:54 PM
ceph_metadata_grow.PNG (74.4 KB) ceph_metadata_grow.PNG Thore K, 05/14/2019 04:55 PM
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 #1

Updated by Thore K almost 5 years ago

So - turns out - i installed the new dashboard module and enabled it, I guess it caused a reload or swap of the mgr (since there is a small gap in the prometheus metrics).
Anyway, after enabling the dashboard the number of objects and used pool size dropped back to the previous values.

So, whatever it was, it has magically fixed itself. It might be a prometheus exporter issue, though I'm pretty sure I have seen the wrong amount of used TiB in the autoscaler output as well but haven't screenshotted it.

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