Hi,all
 I starts a flink program and it runs on yarn. At first it doesn’t aquire 
enough resources so this is thrown.
“org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: 
Could not allocate all requires slots within timeout of 300000 ms. Slots 
required: 16, slots allocated: 7”.
 Then the jobmanager automatically restarts but fail to trigger checkpoint 
anymore because “expired before completing”. All the taskmanagers are blocked, 
and I find there seems to be a dead lock inSafetyNetCloseableRegistry, and 
maybe that’s why the whole taskmanager is blocked. Here is the taskmanager’s 
stack:
 
 Best, Jiayi Liao

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