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https://issues.apache.org/jira/browse/FLINK-10377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984469#comment-16984469
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Piotr Nowojski commented on FLINK-10377:
----------------------------------------
As [reported by a user on the user mailing
list|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/UNCHECKED-Error-while-confirming-Checkpoint-td23213.html],
{{TwoPhaseCommitSinkFunction#notifyCheckpointComplete}} can fail with the
following exception:
{noformat}
java.lang.RuntimeException: Error while confirming checkpoint
at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:1205)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: checkpoint completed, but no
transaction pending
at org.apache.flink.util.Preconditions.checkState(Preconditions.java:195)
at
org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.notifyCheckpointComplete(TwoPhaseCommitSinkFunction.java:267)
at
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyCheckpointComplete(AbstractUdfStreamOperator.java:130)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.notifyCheckpointComplete(StreamTask.java:822)
at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:1200)
... 5 more
{noformat}
This can happen in the following scenario:
# savepoint is triggered
# checkpoint is triggered
# checkpoint completes (but it doesn't subsume the savepoint, because
checkpoints subsume only other checkpoints).
# savepoint completes
In this case, {{TwoPhaseCommitSinkFunction}} receives first notification that
the later checkpoint completed, it commits both savepoint and the checkpoint.
Later when savepoint {{notifyCheckpointComplete}} arrives, the above error will
occur.
Possible trivial fix is to remove that failing {{checkState}}.
> Remove precondition in TwoPhaseCommitSinkFunction.notifyCheckpointComplete
> --------------------------------------------------------------------------
>
> Key: FLINK-10377
> URL: https://issues.apache.org/jira/browse/FLINK-10377
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Labels: pull-request-available
>
> The precondition {{checkState(pendingTransactionIterator.hasNext(),
> "checkpoint completed, but no transaction pending");}} in
> {{TwoPhaseCommitSinkFunction.notifyCheckpointComplete()}} seems too strict,
> because checkpoints can overtake checkpoints and will fail the precondition.
> In this case the commit was already performed by the first notification and
> subsumes the late checkpoint. I think the check can be removed.
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