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https://issues.apache.org/jira/browse/FLINK-7043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Wysakowicz closed FLINK-7043.
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Resolution: Duplicate
> Optimize state handling in NFA
> ------------------------------
>
> Key: FLINK-7043
> URL: https://issues.apache.org/jira/browse/FLINK-7043
> Project: Flink
> Issue Type: Sub-task
> Components: CEP
> Affects Versions: 1.3.1
> Reporter: Kostas Kloudas
> Assignee: Dawid Wysakowicz
> Priority: Major
>
> The checkpointed state of the NFA is consisted of:
> 1) The States/ windowTime/ handleTimeout flag (also contains the
> IterativeConditions)
> 2) The sharedBuffer
> 3) The computationStates
> From these 3:
> 1) is static, as it is the description of the NFA which is static throughout
> the lifetime of the NFA, and
> 2) and 3) that are dynamic, as at any point they depend on the already
> consumed input.
> This issue proposes to leverage the fact the 1 is static and store it on a
> separate keyed valueState than the NFA. This way, in the
> {{AbstractKeyedCEPPatternOperator.getNFA()}} which is called at each
> watermark and for each active key, we will just serialize/deserialize the
> dynamic state, while the static one we will serialize it only upon
> checkpointing, and deserialize it upon restoring.
> We need to checkpoint also the static state because we want in the future to
> be able to add Patterns at runtime to the same operator, e.g. through a
> coStream.
> So given that now we must have a way to match the dynamic with the static
> state of the NFA, we will have to introduce a name (or id) for a given
> Pattern/NFA. This will be stored with both the
> static and the dynamic state, and upon restoring we will be able to match the
> two based on that name. This name will be user-defined and can be specified
> through a `name()` method in the Pattern class (like the begin()).
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