azagrebin commented on a change in pull request #6632:
[FLINK-10254][backend]Fix inappropriate checkNotNull in stateBackend
URL: https://github.com/apache/flink/pull/6632#discussion_r213735414
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/state/AbstractKeyedStateBackend.java
##########
@@ -100,9 +100,11 @@ public AbstractKeyedStateBackend(
ExecutionConfig executionConfig,
TtlTimeProvider ttlTimeProvider) {
+ Preconditions.checkArgument(numberOfKeyGroups >= 1,
"NumberOfKeyGroups must be a positive number");
Review comment:
We can also add this:
```
Preconditions.checkArgument(numberOfKeyGroups >=
keyGroupRange.getNumberOfKeyGroups(), "The total number of key groups must be
at least the number in the key group range assigned to this backend");
```
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