Aljoscha Krettek created FLINK-4169:
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Summary: CEP Does Not Work with RocksDB StateBackend
Key: FLINK-4169
URL: https://issues.apache.org/jira/browse/FLINK-4169
Project: Flink
Issue Type: Bug
Components: CEP
Affects Versions: 1.0.3, 1.0.2, 1.0.1, 1.0.0, 1.1.0
Reporter: Aljoscha Krettek
Priority: Blocker
A job will never match any patterns because {{ValueState.update()}} is not
called in the keyed CEP operators for updating the {{NFA}} state and the
priority queue state.
The reason why it works for other state backends is that they are very lax in
their handling of state: if the object returned from {{ValueState.value())}} is
mutable changes to this will be reflected in checkpoints even if
{{ValueState.update()}} is not called. RocksDB, on the other hand, does always
deserialize/serialize state values when accessing/updating them, so changes to
the returned object will not be reflected in the state unless {{update()}} is
called.
We should fix this and also add a test for it. This might be tricky because we
have to pull together RocksDB and CEP.
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