zoucao created FLINK-26723:
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Summary: Fix the content of exception in SourceCoordinatorContext
Key: FLINK-26723
URL: https://issues.apache.org/jira/browse/FLINK-26723
Project: Flink
Issue Type: Improvement
Components: Runtime / Coordination
Reporter: zoucao
the exception in `SourceCoordinatorContext#SourceCoordinatorContext` will
always be
"Cannot assign splits null to subtask xxx because the subtask is not
registered."
We should fix it by using splits info.
[see|https://github.com/apache/flink/blob/ccbb05ea4f11aac51103cadd13a6a2e38e319e8b/flink-runtime/src/main/java/org/apache/flink/runtime/source/coordinator/SourceCoordinatorContext.java#L202]
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