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From "Matthieu Morel (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (S4-44) optional backoff upon multiple consecutive failed checkpoint fetches
Date Tue, 14 Feb 2012 01:20:59 GMT
optional backoff upon multiple consecutive failed checkpoint fetches
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                 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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