Anton Kalashnikov created FLINK-24468:
-----------------------------------------

             Summary: NPE when notifyNewBufferSize
                 Key: FLINK-24468
                 URL: https://issues.apache.org/jira/browse/FLINK-24468
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
    Affects Versions: 1.14.0
            Reporter: Anton Kalashnikov
            Assignee: Anton Kalashnikov


In my opinion, we have two problem there:
 # The exception itself(see below)
 # Ignoring the exception and stopping rescheduling of the calculation of the 
buffer size.

Of course, we need to fix this NPE and we need to think what we want to do if 
the buffer debloat fails with error.

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java.lang.NullPointerException: null
 at 
org.apache.flink.runtime.io.network.netty.CreditBasedPartitionRequestClientHandler.notifyNewBufferSize(CreditBasedPartitionRequestClientHandler.java:135)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.io.network.netty.NettyPartitionRequestClient.notifyNewBufferSize(NettyPartitionRequestClient.java:203)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel.notifyNewBufferSize(RemoteInputChannel.java:330)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel.announceBufferSize(RemoteInputChannel.java:299)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.announceBufferSize(SingleInputGate.java:389)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.taskmanager.InputGateWithMetrics.announceBufferSize(InputGateWithMetrics.java:102)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.bufferdebloat.BufferDebloater.recalculateBufferSize(BufferDebloater.java:118)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.debloat(StreamTask.java:795)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$null$4(StreamTask.java:784)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.util.function.FunctionUtils.lambda$asCallable$5(FunctionUtils.java:126)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90) 
~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsNonBlocking(MailboxProcessor.java:353)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:317)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:814)
 ~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:761) 
~[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at 
org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958)
 [flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:937) 
[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:754) 
[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575) 
[flink-dist_2.12-1.15-SNAPSHOT.jar:1.15-SNAPSHOT]
 at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]

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