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https://issues.apache.org/jira/browse/OAK-3864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-3864:
-------------------------------
Description:
In some situations {{FileStore.cleanup()}} may remove segments that are still
referenced, subsequently causing a {{SNFE}}.
This is a regression introduced with OAK-1828.
{{FileStore.cleanup()}} relies on the ordering of the segments in the tar
files: later segments only reference earlier segments. As we have seen in other
places this assumption does not hold any more (e.g. OAK-3794, OAK-3793) since
OAK-1828.
{{cleanup}} traverses the segments backwards maintaining a list of referenced
ids. When a segment is not in that list, it is removed. However, this approach
does not work with forward references as those are only seen later when the
segment has been removed already.
cc [~alex.parvulescu], [~frm]
was:
In some situations {{FileStore.cleanup()}} may remove segments that are still
referenced, subsequently causing a {{SNFE}}.
This is a regression introduced with OAK-1828.
{{FileStore.cleanup()}} relies on the ordering of the segments in the tar
files: later segments only reference earlier segments. As we have seen in other
places this assumption does not hold any more (e.g. OAK-3794, OAK-3793) since
OAK-1828.
{{cleanup}} traverses the segments backwards maintaining a list of referenced
ids. When a segment is not in that list, it is removed. However, this approach
does not work with forward references as those are only seen later when the
segment has been removed already.
> Filestore cleanup removes referenced segments
> ---------------------------------------------
>
> Key: OAK-3864
> URL: https://issues.apache.org/jira/browse/OAK-3864
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segmentmk
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Blocker
> Labels: regression
> Fix For: 1.3.14
>
>
> In some situations {{FileStore.cleanup()}} may remove segments that are still
> referenced, subsequently causing a {{SNFE}}.
> This is a regression introduced with OAK-1828.
> {{FileStore.cleanup()}} relies on the ordering of the segments in the tar
> files: later segments only reference earlier segments. As we have seen in
> other places this assumption does not hold any more (e.g. OAK-3794, OAK-3793)
> since OAK-1828.
> {{cleanup}} traverses the segments backwards maintaining a list of
> referenced ids. When a segment is not in that list, it is removed. However,
> this approach does not work with forward references as those are only seen
> later when the segment has been removed already.
> cc [~alex.parvulescu], [~frm]
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