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https://issues.apache.org/jira/browse/FLINK-3339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15132853#comment-15132853
]
Aljoscha Krettek commented on FLINK-3339:
-----------------------------------------
The problem is that the recent change to the state interface enhanced {{State}}
with a {{clear()}} method for removing state. Before, one had to use
{{OperatorState.update(null)}} to remove state, now the preferred choice would
be {{ValueState.clear()}}. We have to decide whether we want to reintroduce the
old behavior of clearing state if a user gives {{null}} to {{update()}}.
On a side note, the Scala {{*WithState}} family of methods could use some more
tests to catch these kinds of problems.
> Checkpointing NPE when using filterWithState
> --------------------------------------------
>
> Key: FLINK-3339
> URL: https://issues.apache.org/jira/browse/FLINK-3339
> Project: Flink
> Issue Type: Bug
> Reporter: Shikhar Bhushan
>
> (1.0-SNAPSHOT)
> I am using the Scala API keyedStream.filterWithState(..), where the state is
> an Option[Long]
> I am seeing the following error which goes away if I remove the filter.
> {noformat}
> 02/04/2016 14:10:19 Job execution switched to status FAILING.
> java.lang.RuntimeException: Error triggering a checkpoint as the result of
> receiving checkpoint barrier
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$2.onEvent(StreamTask.java:651)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$2.onEvent(StreamTask.java:644)
> at
> org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:201)
> at
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:127)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:173)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:63)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:218)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:562)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.api.common.typeutils.base.LongSerializer.serialize(LongSerializer.java:63)
> at
> org.apache.flink.api.common.typeutils.base.LongSerializer.serialize(LongSerializer.java:27)
> at
> org.apache.flink.runtime.state.memory.AbstractMemState.snapshot(AbstractMemState.java:74)
> at
> org.apache.flink.runtime.state.AbstractStateBackend.snapshotPartitionedState(AbstractStateBackend.java:245)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotOperatorState(AbstractStreamOperator.java:174)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotOperatorState(AbstractUdfStreamOperator.java:119)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:470)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$2.onEvent(StreamTask.java:648)
> ... 8 more
> {noformat}
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