Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1030#issuecomment-142014348 I reworked this quite heavily during merging. There were a lot of issues that were against good Java style: - Variables in the classes, rather than in methods - The way references to threads were obtained - Defining clear parameter checks and exceptions - Handling InterruptedExceptions - polling versus clear conditions when state can be checked You can have a look at the code after my fixes, to see these issues in context. I would suggest to get a Java book (like "Effective Java", that is a good one) and take this as a guideline for future work. This pull request took more than 70 comments and still needed quite some rework (not for Flink-specific issues, but all of it general Java style/efficiency/correctness). I am afraid we cannot do that for every pull request, it would be completely overwhelming...
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