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From "Vikas Saurabh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-3372) Collapsing external events in BackgroundObserver even before queue is full leads to JournalEntry not getting used
Date Tue, 01 Dec 2015 15:50:10 GMT

    [ https://issues.apache.org/jira/browse/OAK-3372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033913#comment-15033913
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Vikas Saurabh commented on OAK-3372:
------------------------------------

[~mduerig], I think we should backport this issue as it's useful with journal optimization.
(cc [~mreutegg])

> Collapsing external events in BackgroundObserver even before queue is full leads to JournalEntry
not getting used
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: OAK-3372
>                 URL: https://issues.apache.org/jira/browse/OAK-3372
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.3.5
>            Reporter: Vikas Saurabh
>            Assignee: Michael Dürig
>              Labels: candidate_oak_1_0, candidate_oak_1_2, resilience
>             Fix For: 1.3.10
>
>         Attachments: OAK-3372.patch
>
>
> BackgroundObserver currently merges external events if the last one in queue is also
an external event. This leads to diff being done for a revision pair which is different from
the ones pushed actively into cache during backgroud read (using JournalEntry) i.e. diff queries
for {{diff("/a/b", rA, rC)}} while background read had pushed results of {{diff("/a/b", rA,
rB)}} and {{diff("/a/b", rB, rC)}}.
> (cc [~mreutegg], [~egli], [~chetanm], [~mduerig])



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