Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1953#issuecomment-220105461
We recently became more aware of build time increases due to our usage of a
lot of ITCases. I think we should have the tests as unit tests instead of
ITCases since they can be run a lot quicker. In our case, we would just
instantiate the writer directly, have it write, simulate a cancel and use
`getPos` before.
I'm sorry that this PR is taking so long to get in.
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