Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1075#issuecomment-136619441
@s1ck, it's important to note that `1` will be subtracted from
`getRuntimeContext().getNumberOfParallelSubtasks()` and not `getBitSize()`. The
reason is that we have `0` based indices for the subtasks. Thus, we only have
to calculate the maximum needed bits for the highest index we can encounter.
And this is `getRuntimeContext().getNumberOfParallelSubtasks() - 1`. Thus if
`getNumberOfParallelSubtasks == 7`, then we would calculate `getBitSize(6) ==
3`.
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