Github user rmetzger commented on the pull request: https://github.com/apache/flink/pull/301#issuecomment-71434721 The user who requested this feature actually asked for a custom method to overwrite. There is one more important use-case for a custom method: If users want to have files named exactly like hadoop, they also need a method. Hadoop is using 6-digit numbers, filled up with zeroes (for example part-m-000001). I'm tired of changing the pull request until everybody is happy. Its very inefficient and I have better stuff to do with my time. If you want, you can change the code once its merged, but I have rewritten this 3 times now.
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