Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3572#discussion_r106906232
--- Diff:
flink-runtime/src/main/java/org/apache/flink/migration/runtime/checkpoint/KeyGroupState.java
---
@@ -30,6 +30,8 @@
*
* The key group state handle is kept in serialized form because it can
contain user code classes
* which might not be available on the JobManager.
+ *
+ * @deprecated Internal class for savepoint backwards compatability. Don't
use for other purposes.
--- End diff --
typo: compatibility
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