Axel Hanikel created OAK-10771:
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Summary: Add disk cache size stats and issue warning if evicted
segment has zero length
Key: OAK-10771
URL: https://issues.apache.org/jira/browse/OAK-10771
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segment-azure
Affects Versions: 1.62.0
Reporter: Axel Hanikel
Fix For: 1.64.0
Note: The component is actually {{segment-remote}} but that's not on the list.
The persistent disk cache computes its size internally by adding/subtracting
the size of added/purged segments. We would like to be able to see if that
computation is correct, by having both the computed size and the effective size
on disk in the metrics.
The background for this is that in a few rare instances, the disk cache evicted
too many items (down to almost zero) instead of the expected 65% of its max
size.
Also we want to make sure that no evictions happen on items that have a length
of zero. We're not sure if that happens or not, so the change is to refuse
eviction in that case and log a warning instead.
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