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From "Ufuk Celebi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4445) Ignore unmatched state when restoring from savepoint
Date Mon, 22 Aug 2016 08:46:20 GMT
Ufuk Celebi created FLINK-4445:
----------------------------------

             Summary: Ignore unmatched state when restoring from savepoint
                 Key: FLINK-4445
                 URL: https://issues.apache.org/jira/browse/FLINK-4445
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
    Affects Versions: 1.1.1
            Reporter: Ufuk Celebi


When currently submitting a job with a savepoint, we require that all state is matched to
the new job. Many users have noted that this is overly strict. I would like to loosen this
and allow savepoints to be restored without matching all state.

The following options come to mind:

(1) Keep the current behaviour, but add a flag to allow ignoring state when restoring, e.g.
{{bin/flink -s <savepoint> --ignoreUnmatchedState}}. This would be non-API breaking.

(2) Ignore unmatched state and continue. Additionally add a flag to be strict about checking
the state, e.g. {{bin/flink -s <savepoint> --strict}}. This would be API-breaking as
the default behaviour would change. Users might be confused by this because there is no straight
forward way to notice that nothing has been restored.

I'm not sure what's the best thing here. [~gyfora], [~aljoscha] What do you think?



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