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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-6888) Flushing the FileStore might return before data is persisted
Date Wed, 01 Nov 2017 14:06:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-6888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16234102#comment-16234102
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Julian Reschke commented on OAK-6888:
-------------------------------------

New issue OAK-6894 which might be caused by this change.

> Flushing the FileStore might return before data is persisted
> ------------------------------------------------------------
>
>                 Key: OAK-6888
>                 URL: https://issues.apache.org/jira/browse/OAK-6888
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: segment-tar
>            Reporter: Francesco Mari
>            Assignee: Francesco Mari
>            Priority: Major
>             Fix For: 1.8, 1.7.11
>
>         Attachments: failure.txt
>
>
> The implementation of {{FileStore#flush}} might return before all the expected data is
persisted on disk. 
> The root cause of this behaviour is the implementation of {{TarRevisions#flush}}, which
is too lenient when acquiring the lock for the journal file. If a background flush operation
is in progress and a user calls {{FileStore#flush}}, that method will immediately return because
the lock of the journal file is already owned by the background flush operation. The caller
doesn't have the guarantee that everything committed before {{FileStore#flush}} is persisted
to disk when the method returns. 
> A fix for this problem might be to create an additional implementation of flush. The
current implementation, needed for the background flush thread, will not be exposed to the
users of {{FileStore}}. The new implementation of {{TarRevisions#flush}} should have stricter
semantics and always guarantee that the persisted head contains everything visible to the
user of {{FileStore}} before the flush operation was started.



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