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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