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From "Andrew Efimov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4905) Kafka test instability IllegalStateException: Client is not started
Date Sun, 20 Nov 2016 02:57:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15680307#comment-15680307
] 

Andrew Efimov commented on FLINK-4905:
--------------------------------------

I have started investigation the issue and what I have:
1. InterruptedException in {{Kafka08Fetcher.runFetchLoop}}
{noformat}
2 > 08:18:41,705 ERROR org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher
 - Exception while shutting down consumer threads
java.lang.InterruptedException
	at java.lang.Object.wait(Native Method)
	at java.lang.Thread.join(Thread.java:1289)
	at org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher.runFetchLoop(Kafka08Fetcher.java:293)
...
{noformat}
root cause - it will occur when call t.join on interrupted thread
In finally block of the {{Kafka08Fetcher.runFetchLoop}} {{t.join}} is called for threads cancelation
procedure, but {{Kafka08Fetcher.runFetchLoop}} is executing in the same thread as {{StreamTask}}

which can be interrupted earlier.
it is fixed by [~StephanEwen] (10/26/16):
{code}
// clear the interruption flag
// this allows the joining on consumer threads (on best effort) to happen in
// case the initial interrupt already
Thread.interrupted();
{code}

There are several problems in the interaction with {{ZookeeperOffsetHandler}}:
2. I agree with [~tzulitai], work with object {{ZookeeperOffsetHandler}} in {{Kafka08Fetcher}}
is not assured thread safe:
ok, there are synchronization points in {{StreamTask}}, but what happens in case of failure
in {{runFetchLoop}}
{{StreamTask}} lock will be free, because {{run()}} is performing, 
during performing finally block another thread can call {{notifyCheckpointComplete}} and acquire
lock
although close method is already called on {{ZookeeperOffsetHandler}}.

3. {{ZookeeperOffsetHandler}} is given into {{PeriodicOffsetCommitter}} thread which is closing
without thread join, also there is possibility to call {{prepareAndCommitOffsets}} although
close method is already called on {{ZookeeperOffsetHandler}}.


> 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
>              Labels: test-stability
>
> 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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