[
https://issues.apache.org/jira/browse/FLINK-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978666#comment-16978666
]
Tim Bess commented on FLINK-14757:
----------------------------------
I probably won't be able to post a stack trace since I ran into the issue at
work, but essentially we were using Flink 1.8.1 successfully, then upgraded to
1.9.1 and the same exact code broke on the `map` after adding the source since
StreamExecutionEnvironment.java [fails to extract the type info on line
1485|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.java#L1485].
I'm assuming that line has always failed due to type erasure issues, but
continued to work since it was overwriting the type info to the correct value
using the Scala implicit.
> scala.StreamExecutionEnvironment Doesn't set return type upon adding source
> ---------------------------------------------------------------------------
>
> Key: FLINK-14757
> URL: https://issues.apache.org/jira/browse/FLINK-14757
> Project: Flink
> Issue Type: Bug
> Components: API / Scala
> Affects Versions: 1.9.0, 1.9.1
> Reporter: Tim Bess
> Priority: Major
>
> [This
> line|https://github.com/apache/flink/blob/d36ce5ff77fae2b01b8fbe8e5c15d610de8ed9f5/flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/StreamExecutionEnvironment.scala#L618]
> in StreamExecutionEnvironment.scala was changed to remove the `returns` call
> starting in version 1.9.0. This causes subsequent transformations on the
> stream to fail since the return TypeInformation isn't set anymore.
>
> Looks like the change was made in [this
> pr|https://github.com/apache/flink/pull/8914]. Guessing it was a mistake
> unless there's some reason to do this that I'm not understanding.
>
> I'm willing to make the PR to fix it, just need it changed so we can start
> upgrading our microservices to 1.9.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
