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https://issues.apache.org/jira/browse/OAK-6106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15982532#comment-15982532
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Michael Dürig commented on OAK-6106:
------------------------------------
Benchmarks:
{code}
# ConcurrentReadTest C min 10% 50% 90% max
N
Oak-Segment-Tar w/o r1792030 1 26 86 107 133 289
1656
Oak-Segment-Tar w r1792030 1 102 175 251 303 435
729
{code}
> Excessive memory usage by the cached 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
> Labels: perfomance
> Fix For: 1.7.0, 1.8
>
> Attachments: OAK-6106.patch
>
>
> 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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