[jira] [Updated] (OAK-10771) Add disk cache size stats and issue warning if evicted segment has zero length

["Julian Reschke (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-10771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Reschke updated OAK-10771:
---------------------------------
    Fix Version/s: 1.66.0
                       (was: 1.64.0)

> 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
>            Priority: Major
>             Fix For: 1.66.0
>
>
> 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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