Github user ggevay commented on the issue:
https://github.com/apache/flink/pull/3511
I pushed some commits here:
[https://github.com/ggevay/flink/tree/sorter-codegen](https://github.com/ggevay/flink/tree/sorter-codegen)
I fixed one issue by adding the `CLUSTER_WITH_CODEGENERATION_ENABLED` case
to the switch in `DriverBaseITCase.getSystemOutput`.
However, the randomly occurring `FileNotFoundException` is more tough to
fix. I think this is happening because of some Travis bug around creating
temporary files. Here are some Jiras that might be the same issue:
[https://issues.apache.org/jira/browse/FLINK-2498](https://issues.apache.org/jira/browse/FLINK-2498)
[https://issues.apache.org/jira/browse/FLINK-2719](https://issues.apache.org/jira/browse/FLINK-2719)
The only fix that I can think of is to not compile the generated code from
a file, but generate it into a string, and use that overload of `cook` that
takes a string instead of a file. (But we might still want to also write the
generated code to a file, to be able to look at the generated code for
debugging purposes. We just won't use that file for compiling.)
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