Tzu-Li (Gordon) Tai created FLINK-6565:
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Summary: Improve error messages for state restore failures
Key: FLINK-6565
URL: https://issues.apache.org/jira/browse/FLINK-6565
Project: Flink
Issue Type: Improvement
Components: State Backends, Checkpointing
Affects Versions: 1.3.0
Reporter: Tzu-Li (Gordon) Tai
Assignee: Tzu-Li (Gordon) Tai
Priority: Critical
The error messages thrown when state restore fails needs to be more explicit
and clear of the actual reason.
At least 2 cases we've seen so far:
1.
For example, currently, when restoring an operator state or memory-backed keyed
state, the previous serializer must exist. If it doesn't exist, currently only
a vague NPE is thrown, without a clear message of the actual reason.
2.
If the restore failure was due to an incompatible version of a serializer's
config snapshot, then it should report something more informative then:
"Incompatible version: found 1, required 1."
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