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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Created] (OAK-3864) Filestore cleanup removes referenced segments
Date Tue, 12 Jan 2016 11:06:39 GMT
Michael Dürig created OAK-3864:

             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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