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From "Vikas Saurabh (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-3372) Collapsing external events in BackgroundObserver even before queue is full leads to JournalEntry not getting used
Date Thu, 03 Dec 2015 16:05:11 GMT

     [ https://issues.apache.org/jira/browse/OAK-3372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vikas Saurabh updated OAK-3372:
-------------------------------
    Labels: performance resilience  (was: candidate_oak_1_0 candidate_oak_1_2 resilience)

> 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: performance, resilience
>             Fix For: 1.3.10, 1.2.9, 1.0.25
>
>         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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