Till Rohrmann created FLINK-3187:
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Summary: Decouple restart strategy from ExecutionGraph
Key: FLINK-3187
URL: https://issues.apache.org/jira/browse/FLINK-3187
Project: Flink
Issue Type: Improvement
Affects Versions: 1.0.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Priority: Minor
Currently, the {{ExecutionGraph}} supports the following restart logic:
Whenever a failure occurs and the number of restart attempts aren't depleted,
wait for a fixed amount of time and then try to restart. This behaviour can be
controlled by the configuration parameters {{execution-retries.default}} and
{{execution-retries.delay}}.
I propose to decouple the restart logic from the {{ExecutionGraph}} a bit by
introducing a strategy pattern. That way it would not only allow us to define a
job specific restart behaviour but also to implement different restart
strategies. Conceivable strategies could be: Fixed timeout restart, exponential
backoff restart, partial topology restarts, etc.
This change is a preliminary step towards having a restart strategy which will
scale the parallelism of a job down in case that not enough slots are available.
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