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From "Francesco Mari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-4558) SegmentNodeState.fastEquals() can trigger two I/O operations
Date Fri, 22 Jul 2016 14:11:22 GMT

     [ https://issues.apache.org/jira/browse/OAK-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Francesco Mari updated OAK-4558:
--------------------------------
    Fix Version/s:     (was: Segment Tar 0.0.6)
                   Segment Tar 0.0.8

> SegmentNodeState.fastEquals() can trigger two I/O operations
> ------------------------------------------------------------
>
>                 Key: OAK-4558
>                 URL: https://issues.apache.org/jira/browse/OAK-4558
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Francesco Mari
>            Assignee: Francesco Mari
>              Labels: performance
>             Fix For: Segment Tar 0.0.8
>
>
> The implementation of {{SegmentNodeState.fastEquals()}} compares the stable IDs of two
instances of {{SegmentNodeState}}. In some cases, reading the stable ID would trigger a read
of an additional record, the block record containing the serialized version of the segment
ID.
> This issue is about evaluating the performance implications of this strategy and, in
particular, if it would be better to store the serialized stable ID in the node record itself.



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