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https://issues.apache.org/jira/browse/FLINK-20418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Arvid Heise resolved FLINK-20418.
---------------------------------
Resolution: Fixed
> NPE in IteratorSourceReader
> ---------------------------
>
> Key: FLINK-20418
> URL: https://issues.apache.org/jira/browse/FLINK-20418
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.12.0
> Reporter: Roman Khachatryan
> Assignee: Arvid Heise
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> With the following job
> {code}
> @Test
> public void testNpe() throws Exception {
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env.setParallelism(1);
> env.setRestartStrategy(new NoRestartStrategyConfiguration());
> env.enableCheckpointing(50, CheckpointingMode.EXACTLY_ONCE);
> env
> .fromSequence(0, 100)
> .map(x -> {
> Thread.sleep(10);
> return x;
> })
> .addSink(new DiscardingSink<>());
> env.execute();
> }
> {code}
> I (always) get an exception like this:
> {code}
> ...
> Caused by: java.lang.Exception: Could not perform checkpoint 1 for operator
> Source: Sequence Source -> Map -> Sink: Unnamed (1/1)#0.
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:866)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$triggerCheckpointAsync$8(StreamTask.java:831)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:283)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:184)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:575)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:539)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.flink.runtime.checkpoint.CheckpointException: Could not
> complete snapshot 1 for operator Source: Sequence Source -> Map -> Sink:
> Unnamed (1/1)#0. Failure reason: Checkpoint was declined.
> at
> org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:226)
> at
> org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:158)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:343)
> at
> org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.checkpointStreamOperator(SubtaskCheckpointCoordinatorImpl.java:603)
> at
> org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.buildOperatorSnapshotFutures(SubtaskCheckpointCoordinatorImpl.java:529)
> at
> org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.takeSnapshotSync(SubtaskCheckpointCoordinatorImpl.java:496)
> at
> org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.checkpointState(SubtaskCheckpointCoordinatorImpl.java:266)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$9(StreamTask.java:924)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:914)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:857)
> ... 10 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.api.connector.source.lib.util.IteratorSourceReader.snapshotState(IteratorSourceReader.java:132)
> at
> org.apache.flink.streaming.api.operators.SourceOperator.snapshotState(SourceOperator.java:264)
> at
> org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:197)
> ... 20 more
> {code}
> Adding a null check solves the issue. But if I then change sleep time from 10
> to 50 I get
> {code}
> Caused by: java.lang.IllegalArgumentException: 'from' must be <= 'to'
> at
> org.apache.flink.util.Preconditions.checkArgument(Preconditions.java:142)
> at
> org.apache.flink.api.connector.source.lib.NumberSequenceSource$NumberSequenceSplit.<init>(NumberSequenceSource.java:142)
> at
> org.apache.flink.api.connector.source.lib.NumberSequenceSource$NumberSequenceSplit.getUpdatedSplitForIterator(NumberSequenceSource.java:169)
> at
> org.apache.flink.api.connector.source.lib.NumberSequenceSource$NumberSequenceSplit.getUpdatedSplitForIterator(NumberSequenceSource.java:135)
> at
> org.apache.flink.api.connector.source.lib.util.IteratorSourceReader.snapshotState(IteratorSourceReader.java:135)
> at
> org.apache.flink.streaming.api.operators.SourceOperator.snapshotState(SourceOperator.java:264)
> at
> org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:197)
> ... 20 more
> {code}
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