Michael Dürig created OAK-3864:
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Summary: 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
Fix For: 1.4
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.
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