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From "Matthieu Morel (Created) (JIRA)" <>
Subject [jira] [Created] (S4-42) Optional recovery of expired and checkpointed PEs.
Date Mon, 30 Jan 2012 19:19:10 GMT
Optional recovery of expired and checkpointed PEs.

                 Key: S4-42
             Project: Apache S4
          Issue Type: New Feature
    Affects Versions: 0.4
            Reporter: Matthieu Morel
             Fix For: 0.4

S4 provides a caching mechanism for PEs, and PEs can be assigned a time to live. After that
time, the PE instance is removed from the cache and may be garbage collected.

When combining with the checkpointing mechanism, expired but checkpointed PEs are restored
from a former checkpoint.

This may or may not be desired, depending on the use case. Therefore we must provide an option
to restore - or not - the state of an expired but checkpointed PE.

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