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From "Matthieu Morel (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-44) optional backoff upon multiple consecutive failed checkpoint fetches
Date Thu, 01 Mar 2012 17:31:58 GMT

    [ https://issues.apache.org/jira/browse/S4-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13220172#comment-13220172
] 

Matthieu Morel commented on S4-44:
----------------------------------

implemented in branch S4-44 https://git-wip-us.apache.org/repos/asf?p=incubator-s4.git;a=tree;h=refs/heads/S4-44;hb=S4-44


I also refactored the checkpointing mechanism so that time-based checkpointing does not generate
extra events.
                
> optional backoff upon multiple consecutive failed checkpoint fetches
> --------------------------------------------------------------------
>
>                 Key: S4-44
>                 URL: https://issues.apache.org/jira/browse/S4-44
>             Project: Apache S4
>          Issue Type: Improvement
>    Affects Versions: 0.4
>            Reporter: Matthieu Morel
>             Fix For: 0.4
>
>
> if a checkpointing backend system becomes unresponsive (e.g. stalled NFS), and that a
series of recoveries is to proceed (for instance, startup or failover), then each checkpoint
fetching operation will block, wait for a timeout or another kind of exception, and the system
will then continue without recovering this PE.
> We should provide a way to detect this pattern (multiple backend fetches failures in
a short amount of time) and temporarily disable fetching from the backend, in order to reduce
blocking when backend becomes unresponsive.

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