Felix Wollschläger created FLINK-16596:
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Summary: Support Enum-Values as part of a Key
Key: FLINK-16596
URL: https://issues.apache.org/jira/browse/FLINK-16596
Project: Flink
Issue Type: Improvement
Reporter: Felix Wollschläger
See: FLINK-11774
h2. Description:
The hashCode implementation of Enum-Values is guaranteed to be stable inside a
JVM, but not accross multiple JVMs. This leads to failures when restoring from
a checkpoint/savepoint containing Keyed-State on Keys with Enums as a part of
the key.
For users of Flink there is a workaround to solve this problem:
Don't rely on the hashCode-Implementation of Enum-Values in the
hashCode-Implementation of the actual key. Use the ordinal() or
name().hashCode() instead of the Enum hashCode.
h2. Goals of this improvement:
Implement a way to handle Enum-Values, by either handling Enum-Values on a
internal level or implementing a abstract Base KeySelector class that users of
flink can choose if their key contains a Enum-Value.
Code to reproduce a failure and first thoughts can be found in FLINK-11774 .
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