Myasuka commented on issue #9123: [FLINK-13281] Fix the verify logic of 
AdaptedRestartPipelinedRegionStrategyNGAbortPendingCheckpointsTest
URL: https://github.com/apache/flink/pull/9123#issuecomment-511727785
 
 
   @tillrohrmann I would try to interpret this more clearly below:
   After [FLINK-13060](https://issues.apache.org/jira/browse/FLINK-13060), 
`AdaptedRestartPipelinedRegionStrategyNGAbortPendingCheckpointsTest` still use 
previous `InfiniteDelayRestartStrategy` which means 
`AdaptedRestartPipelinedRegionStrategyNG#resetTasks()` would never be called 
when some task failed. The root cause why previous 
`AdaptedRestartPipelinedRegionStrategyNGAbortPendingCheckpointsTest` could 
still pass is because of the pending checkpoints are aborted by 
`failUnacknowledgedPendingCheckpointsFor()` method in `CheckpointCoordinator` 
(which is actually introduced vai 
[FLINK-7844](https://issues.apache.org/jira/browse/FLINK-7844) ). 
   
   In a nutshell, we expect pending checkpoints are aborted by 
`AdaptedRestartPipelinedRegionStrategyNG#resetTasks()` not 
`CheckpointCoordinator#failUnacknowledgedPendingCheckpointsFor()`.

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