Github user shixiaogang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3870#discussion_r116161754
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java
---
@@ -922,6 +940,39 @@ void releaseResources(boolean canceled) {
}
}
}
+
+ /**
+ * A placeholder state handle for shared state that will
replaced by an original that was
+ * created in a previous checkpoint. So we don't have to send
the handle twice, e.g. in
+ * case of {@link ByteStreamStateHandle}.
+ */
+ private static final class PlaceholderStreamStateHandle
implements StreamStateHandle {
--- End diff --
I think we can move `PlaceholderStreamStateHandle` out so that it can be
used by other state backends. What do you think?
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