[FLINK-3339] Checkpointing NPE when using filterWithState

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Assignee: Aljoscha Krettek
• Reporter: Shikhar Bhushan
• Created: 04/Feb/16 19:11
• Updated: 08/Feb/16 12:21
• Resolved: 08/Feb/16 12:04

Description

(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.

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