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From "Francesco Mari (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-6919) SegmentCache might introduce unwanted memory references to SegmentId instances
Date Wed, 08 Nov 2017 14:51:01 GMT
Francesco Mari created OAK-6919:
-----------------------------------

             Summary: SegmentCache might introduce unwanted memory references to SegmentId
instances
                 Key: OAK-6919
                 URL: https://issues.apache.org/jira/browse/OAK-6919
             Project: Jackrabbit Oak
          Issue Type: Improvement
            Reporter: Francesco Mari
            Assignee: Francesco Mari
             Fix For: 1.8, 1.7.12


{{SegmentCache}} contains, through the underlying Guava cache, hard references to both {{SegmentId}}
and {{Segment}} instances. Thus, {{SegmentCache}} contributes to the computation of in-memory
references that, in turn, constitute the root references of the garbage collection algorithm.

Further investigations are needed to assess this statement but, if {{SegmentCache}} is proved
to be problematic, there are some possible solutions.

For example, {{SegmentCache}} might be reworked to store references to MSB/LSB pairs as keys,
instead of to {{SegmentId}} instances. Moreover, instead of referencing {{Segment}} instances
as values, {{SegmentCache}} might hold references to their underlying {{ByteBuffer}}. With
these changes in place, {{SegmentCache}} would not interfere with {{SegmentTracker}} and the
garbage collection algorithm.



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