[ 
https://issues.apache.org/jira/browse/FLINK-18196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Kai Chen updated FLINK-18196:
-----------------------------
    Description: 
I meet checkpoint NPE when executing wordcount example:

java.lang.Exception: Could not perform checkpoint 5505 for operator Source: 
KafkaTableSource(xxx) > SourceConversion(table=[xxx, source: 
[KafkaTableSource(xxx)]], fields=[xxx]) > Calc(select=[xxx) AS xxx]) -> 
SinkConversionToTuple2 -- - > Sink: Elasticsearch6UpsertTableSink(xxx) (1/1).

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:802)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$triggerCheckpointAsync$3(StreamTask.java:777)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$228/1024478318.call(Unknown
 Source)

    at java.util.concurrent.FutureTask.run(FutureTask.java:266)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.run(StreamTaskActionExecutor.java:87)

    at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78)

    at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:261)

    at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:487)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)

    at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:707)

    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:532)

    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:1411)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:991)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$5(StreamTask.java:887)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$229/1010499540.run(Unknown
 Source)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:94)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:860)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:793)

    ... 12 more

  was:
I meet checkpoint NPE when executing wordcount example:

java.lang.Exception: Could not perform checkpoint 5505 for operator Source: 
KafkaTableSource(xxx) > SourceConversion(table=[xxx, source: 
[KafkaTableSource(xxx)]], fields=[xxx]) -> Calc(select=[xxx) AS xxx]) -> 
SinkConversionToTuple2 -- > Sink: Elasticsearch6UpsertTableSink(xxx) (1/1).

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:802)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$triggerCheckpointAsync$3(StreamTask.java:777)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$228/1024478318.call(Unknown
 Source)

    at java.util.concurrent.FutureTask.run(FutureTask.java:266)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.run(StreamTaskActionExecutor.java:87)

    at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78)

    at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:261)

    at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:487)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)

    at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:707)

    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:532)

    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:1411)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:991)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$5(StreamTask.java:887)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$229/1010499540.run(Unknown
 Source)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:94)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:860)

    at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:793)

    ... 12 more


> flink throws `NullPointerException` when executeCheckpointing
> -------------------------------------------------------------
>
>                 Key: FLINK-18196
>                 URL: https://issues.apache.org/jira/browse/FLINK-18196
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Checkpointing
>    Affects Versions: 1.10.0, 1.10.1
>            Reporter: Kai Chen
>            Priority: Major
>
> I meet checkpoint NPE when executing wordcount example:
> java.lang.Exception: Could not perform checkpoint 5505 for operator Source: 
> KafkaTableSource(xxx) > SourceConversion(table=[xxx, source: 
> [KafkaTableSource(xxx)]], fields=[xxx]) > Calc(select=[xxx) AS xxx]) -> 
> SinkConversionToTuple2 -- - > Sink: Elasticsearch6UpsertTableSink(xxx) (1/1).
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:802)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$triggerCheckpointAsync$3(StreamTask.java:777)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$228/1024478318.call(Unknown
>  Source)
>     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.run(StreamTaskActionExecutor.java:87)
>     at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78)
>     at 
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:261)
>     at 
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:487)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)
>     at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:707)
>     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:532)
>     at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1411)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:991)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$5(StreamTask.java:887)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$229/1010499540.run(Unknown
>  Source)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:94)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:860)
>     at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:793)
>     ... 12 more



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