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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-6919) SegmentCache might introduce unwanted memory references to SegmentId instances
Date Wed, 08 Nov 2017 16:37:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-6919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-6919:
-------------------------------
    Component/s: segment-tar

> 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
>          Components: segment-tar
>            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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