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https://issues.apache.org/jira/browse/FLINK-1566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324356#comment-14324356
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Gyula Fora commented on FLINK-1566:
-----------------------------------
it is a concurrency issue while adding to an ArrayList from multiple threads.
Turns out its not thread-safe :P
https://github.com/mbalassi/flink/commit/c34f0cb160e91742fe18de87b99d22c039f3f8ea
I will push it if travis passes
> WindowIntegrationTest fails
> ---------------------------
>
> Key: FLINK-1566
> URL: https://issues.apache.org/jira/browse/FLINK-1566
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Till Rohrmann
>
> I'm seeing spurious failures of the {{WindowIntegrationTest}}.
> The error is the following:
> {code}
> java.lang.AssertionError:
> Expected :[[3], [4], [5], [11], [10], [16]]
> Actual :[[3], null, [5], [11], [10], [16]]
> <Click to see difference>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:144)
> at
> org.apache.flink.streaming.api.invokable.operator.windowing.WindowIntegrationTest.validateOutput(WindowIntegrationTest.java:151)
> at
> org.apache.flink.streaming.api.invokable.operator.windowing.WindowIntegrationTest.test(WindowIntegrationTest.java:134)
> {code}
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