各位好，checkpoint相关问题L
flink版本1.10.1:，个别的checkpoint过程发生问题：
java.lang.Exception: Could not perform checkpoint 1194 for operator Map
(3/3).
at
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:816)
at
org.apache.flink.streaming.runtime.io.CheckpointBarrierHandler.notifyCheckpoint(CheckpointBarrierHandler.java:86)
at
org.apache.flink.streaming.runtime.io.CheckpointBarrierTracker.processBarrier(CheckpointBarrierTracker.java:99)
at
org.apache.flink.streaming.runtime.io.CheckpointedInputGate.pollNext(CheckpointedInputGate.java:155)
at
org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:133)
at
org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:69)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:310)
at
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:187)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:485)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:469)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:708)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:533)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1382)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:974)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$5(StreamTask.java:870)
at
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:94)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:843)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:803)
... 12 mor
绝大部分是正常完成的，但是小部分比如上面的情况，就会失败，还会导致suspending-->restart.
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