Till Rohrmann created FLINK-6775:
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Summary: StateDescriptor cannot be shared by multiple subtasks
Key: FLINK-6775
URL: https://issues.apache.org/jira/browse/FLINK-6775
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.2.1, 1.1.4, 1.0.3, 1.3.0, 1.4.0
Reporter: Till Rohrmann
Priority: Blocker
The {{StateDescriptor}} contains the {{TypeSerializer}} which is used to
serialize the state. The serializer instance won't be duplicated when it is
accessed. Therefore, the {{StateDescriptor}} cannot be shared if the
{{TypeSerializer}} is stateful as in the case of the {{KryoSerializer}}.
This problem can easily arise when a user defines a stateful operator which
defines the {{StateDescriptor}} statically. The work around is to not define a
static {{StateDescriptor}}. However, I would still make it a blocker, because
it is extremely hard to debug for the user if things fail because the
{{TypeSerializer}} is used concurrently.
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