klion26 commented on issue #10344: [FLINK-14264][StateBackend][Rest] Expose state backend in checkpoint rest api URL: https://github.com/apache/flink/pull/10344#issuecomment-560210743 @zentol thanks for your review. First, I want to set the `checkpoint backend name` in `StreamingJobGraphGenerator`, so we do not need to update the `checkpoint backend name` after, but we may get a `null` when calling [streamGraph.getStateBackend()](https://github.com/apache/flink/blob/8c6cc4505a4c27daadb00cd94df8a7e955eb8d52/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGenerator.java#L905), so I changed to udpate the `checkpoint backend name` as currently in `ExecutionGraphBuilder` which can get the truely `checkpoint backend name`, this `checkpoint backend` will also be passed into `CheckpointCoordinator` to create the `checkpoint storage`.
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