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[jira] [Created] (FLINK-10753) Propagate and log snapshotting exceptions

Alexander Fedulov created FLINK-10753:

             Summary: Propagate and log snapshotting exceptions
                 Key: FLINK-10753
                 URL: https://issues.apache.org/jira/browse/FLINK-10753
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
    Affects Versions: 1.6.2
            Reporter: Alexander Fedulov
         Attachments: Screen Shot 2018-11-01 at 16.27.01.png

Upon failure, {{AbstractStreamOperator.snapshotState}} rethrows a new exception with the message "{{Could not complete snapshot {} for operator {}.}}" and the original exception as the cause. 

While handling the error, {{CheckpointCoordinator.discardCheckpoint}} method logs only this  propagated message and not the original cause of the exception.

In addition, {{pendingCheckpoint.abortDeclined()}}, called from the {{discardCheckpoint,}}
 reports the failed checkpoint with a misleading message "{{Checkpoint was declined (tasks not ready)}}". This message is what will be displayed in the UI (see attached).

 # Log exception at the Task Manager (.snapshotState)
 # Log cause, instead of cause.getMessage() at the JobsManager (.dicardCheckpoint)
 # Pass root cause to abortDeclined and propagate a more appropriate message to the UI.

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