[
https://issues.apache.org/jira/browse/FLINK-2180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14576968#comment-14576968
]
Gábor Hermann commented on FLINK-2180:
--------------------------------------
I could only reproduce this with sleeping in the IterationHead function here
https://github.com/apache/flink/blob/master/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/IterateTest.java#L50
The iteration maximum wait time is set to 3000, that means the iteration would
stop if it does not get a new element in 3 seconds. I can only think that the
test fails because sometimes the elements arrive that slow and the iteration
finishes prematurely.
I suggest to add a feature so that a predicate could be defined that indicates
when to end the iteration. Like this:
dataStream.iterate(new EndOfIterationPredicate() {
boolean isEndOfIteration(value) {
// ...
}
})
and rewrite the test using this.
I guess that would be useful for some users too. (Mainly for debugging
purposes, as the aim of the max. wait time is also only for debugging.)
> Streaming iterate test fails spuriously
> ---------------------------------------
>
> Key: FLINK-2180
> URL: https://issues.apache.org/jira/browse/FLINK-2180
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 0.9
> Reporter: Márton Balassi
> Assignee: Gábor Hermann
>
> Following output seen occasionally:
> Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 3.667 sec <<<
> FAILURE! - in org.apache.flink.streaming.api.IterateTest
> test(org.apache.flink.streaming.api.IterateTest) Time elapsed: 3.662 sec
> <<< FAILURE!
> java.lang.AssertionError: null
> at org.junit.Assert.fail(Assert.java:86)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at org.junit.Assert.assertTrue(Assert.java:52)
> at org.apache.flink.streaming.api.IterateTest.test(IterateTest.java:154)
> See: https://travis-ci.org/mbalassi/flink/jobs/65803465
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
