[jira] [Updated] (SPARK-2034) KafkaInputDStream doesn't close resources and may prevent JVM shutdown

["Tony Stevenson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tony Stevenson updated SPARK-2034:
----------------------------------
    Assignee: Sean Owen  (was: Sean Owen)

> KafkaInputDStream doesn't close resources and may prevent JVM shutdown
> ----------------------------------------------------------------------
>
>                 Key: SPARK-2034
>                 URL: https://issues.apache.org/jira/browse/SPARK-2034
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 1.0.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>             Fix For: 1.0.1, 1.1.0
>
>
> Tobias noted today on the mailing list:
> {quote}
> I am trying to use Spark Streaming with Kafka, which works like a
> charm -- except for shutdown. When I run my program with "sbt
> run-main", sbt will never exit, because there are two non-daemon
> threads left that don't die.
> I created a minimal example at
> <https://gist.github.com/tgpfeiffer/b1e765064e983449c6b6#file-kafkadoesntshutdown-scala>.
> It starts a StreamingContext and does nothing more than connecting to
> a Kafka server and printing what it receives. Using the `future { ...
> }` construct, I shut down the StreamingContext after some seconds and
> then print the difference between the threads at start time and at end
> time. The output can be found at
> <https://gist.github.com/tgpfeiffer/b1e765064e983449c6b6#file-output1>.
> There are a number of threads remaining that will prevent sbt from
> exiting.
> When I replace `KafkaUtils.createStream(...)` with a call that does
> exactly the same, except that it calls `consumerConnector.shutdown()`
> in `KafkaReceiver.onStop()` (which it should, IMO), the output is as
> shown at <https://gist.github.com/tgpfeiffer/b1e765064e983449c6b6#file-output2>.
> Does anyone have *any* idea what is going on here and why the program
> doesn't shut down properly? The behavior is the same with both kafka
> 0.8.0 and 0.8.1.1, by the way.
> {quote}
> Something similar was noted last year:
> http://mail-archives.apache.org/mod_mbox/spark-dev/201309.mbox/%3C1380220041.2428.YahooMailNeo@web160804.mail.bf1.yahoo.com%3E 
> KafkaInputDStream doesn't close ConsumerConnector in onStop(), and does not close the Executor it creates. The latter leaves non-daemon threads and can prevent the JVM from shutting down even if streaming is closed properly.



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