[
https://issues.apache.org/jira/browse/SPARK-6847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491873#comment-14491873
]
Jack Hu commented on SPARK-6847:
--------------------------------
Hi, [~sowen]
I tested more cases:
# only change the {{newlist.headOption.orElse(oldstate)}} to {{Some("a")}}, the
issue still exists
# only change the streaming batch interval to {{2 seconds}}, keep the
{{newlist.headOption.orElse(oldstate)}} and checkpoint interval 10 seconds, the
issue does not exist.
So this issue may related to the checkpoint interval and batch interval.
> Stack overflow on updateStateByKey which followed by a dstream with
> checkpoint set
> ----------------------------------------------------------------------------------
>
> Key: SPARK-6847
> URL: https://issues.apache.org/jira/browse/SPARK-6847
> Project: Spark
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 1.3.0
> Reporter: Jack Hu
> Labels: StackOverflowError, Streaming
>
> The issue happens with the following sample code: uses {{updateStateByKey}}
> followed by a {{map}} with checkpoint interval 10 seconds
> {code}
> val sparkConf = new SparkConf().setAppName("test")
> val streamingContext = new StreamingContext(sparkConf, Seconds(10))
> streamingContext.checkpoint("""checkpoint""")
> val source = streamingContext.socketTextStream("localhost", 9999)
> val updatedResult = source.map(
> (1,_)).updateStateByKey(
> (newlist : Seq[String], oldstate : Option[String]) =>
> newlist.headOption.orElse(oldstate))
> updatedResult.map(_._2)
> .checkpoint(Seconds(10))
> .foreachRDD((rdd, t) => {
> println("Deep: " + rdd.toDebugString.split("\n").length)
> println(t.toString() + ": " + rdd.collect.length)
> })
> streamingContext.start()
> streamingContext.awaitTermination()
> {code}
> From the output, we can see that the dependency will be increasing time over
> time, the {{updateStateByKey}} never get check-pointed, and finally, the
> stack overflow will happen.
> Note:
> * The rdd in {{updatedResult.map(_._2)}} get check-pointed in this case, but
> not the {{updateStateByKey}}
> * If remove the {{checkpoint(Seconds(10))}} from the map result (
> {{updatedResult.map(_._2)}} ), the stack overflow will not happen
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
