[jira] [Commented] (FLINK-4905) Kafka test instability IllegalStateException: Client is not started

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801086#comment-15801086 ] 

ASF GitHub Bot commented on FLINK-4905:
---------------------------------------

Github user tzulitai commented on the issue:

    https://github.com/apache/flink/pull/3035
  
    Thank you for working on this @BrainLogic!
    
    First, regarding the approach proposed here:
    The approach should be able to fix the `IllegalStateException` we're encountering.
    However, I would also want to try to make `ZookeeperOffsetHandler` thread-safe and insensitive to the ordering `commitOffsets` and `close` are called from the outside. Otherwise, from the context of `Kafka08Fetcher` alone, the reason for the new synchronization isn't that obvious, and might result in harder-to-maintain code in the long run. What do you think?


> Kafka test instability IllegalStateException: Client is not started
> -------------------------------------------------------------------
>
>                 Key: FLINK-4905
>                 URL: https://issues.apache.org/jira/browse/FLINK-4905
>             Project: Flink
>          Issue Type: Bug
>          Components: Kafka Connector
>            Reporter: Robert Metzger
>            Assignee: Andrew Efimov
>              Labels: test-stability
>         Attachments: Kafka08Fetcher.png
>
>
> The following travis build (https://s3.amazonaws.com/archive.travis-ci.org/jobs/170365439/log.txt)  failed because of this error
> {code}
> 08:17:11,239 INFO  org.apache.flink.runtime.jobmanager.JobManager                - Status of job 33ebdc0e7c91be186d80658ce3d17069 (Read some records to commit offsets to Kafka) changed to FAILING.
> java.lang.RuntimeException: Error while confirming checkpoint
> 	at org.apache.flink.runtime.taskmanager.Task$4.run(Task.java:1040)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.IllegalStateException: Client is not started
> 	at org.apache.flink.shaded.com.google.common.base.Preconditions.checkState(Preconditions.java:173)
> 	at org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:113)
> 	at org.apache.curator.utils.EnsurePath$InitialHelper$1.call(EnsurePath.java:148)
> 	at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
> 	at org.apache.curator.utils.EnsurePath$InitialHelper.ensure(EnsurePath.java:141)
> 	at org.apache.curator.utils.EnsurePath.ensure(EnsurePath.java:99)
> 	at org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler.setOffsetInZooKeeper(ZookeeperOffsetHandler.java:133)
> 	at org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler.prepareAndCommitOffsets(ZookeeperOffsetHandler.java:93)
> 	at org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher.commitInternalOffsetsToKafka(Kafka08Fetcher.java:341)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.notifyCheckpointComplete(FlinkKafkaConsumerBase.java:421)
> 	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyOfCompletedCheckpoint(AbstractUdfStreamOperator.java:229)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.notifyCheckpointComplete(StreamTask.java:571)
> 	at org.apache.flink.runtime.taskmanager.Task$4.run(Task.java:1035)
> 	... 5 more
> 08:17:11,241 INFO  org.apache.flink.runtime.taskmanager.Task                     - Attempting to cancel task Source: Custom Source -> Map -> Map -> Sink: Unnamed (1/3)
> {code}



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