Ufuk Celebi created FLINK-4814:

             Summary: Remove extra storage location for externalized checkpoint 
                 Key: FLINK-4814
                 URL: https://issues.apache.org/jira/browse/FLINK-4814
             Project: Flink
          Issue Type: Improvement
            Reporter: Ufuk Celebi

Follow up for FLINK-4512.

Store checkpoint meta data in checkpoint directory.  That makes it simpler for 
users to track and clean up checkpoints manually, if they want to retain 
externalized checkpoints across cancellations and terminal failures.

Every state backend needs to be able to provide a storage location for the 
checkpoint metadata. The memory state backend would hence not work with 
externalized checkpoints, unless one sets explicitly a parameter 

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