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Posted to oak-issues@jackrabbit.apache.org by "Michael Dürig (JIRA)" <ji...@apache.org> on 2017/04/20 09:00:13 UTC

[jira] [Created] (OAK-6106) Excessive memory usage by the caches segment references

Michael Dürig created OAK-6106:
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             Summary: Excessive memory usage by the caches segment references
                 Key: OAK-6106
                 URL: https://issues.apache.org/jira/browse/OAK-6106
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: segment-tar
            Reporter: Michael Dürig
            Assignee: Michael Dürig
             Fix For: 1.7.0, 1.8


The references of a segment to other segments are cached within {{Segment.readReferencedSegments()}}. However caching the {{SegmentId}} instances themselves leads to excessive heap usage as each id also keeps a reference to its underlying segment. 

I suggest to cache those references as msb, lsb pairs instead and create the {{SegmentId}} instance on the fly when required. 



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