0a7dfcc332
This is a followup to the original HADOOP-18546 patch; cherry-picks of that should include this or follow up with it. Removes risk of race conditions in assertions of ITestReadBufferManager on the state of the in-progress and completed queues by removing assertions brittle to race conditions in scheduling/network IO * Waits for all the executor pool shutdown to complete before making any assertions * Assertions that there are no in progress reads MUST be cut as there may be some and they won't be cancelled. * Assertions that the completed list is without buffers of a closed stream are brittle because if there was an in progress stream which completed after stream.close() then it will end up in the list. Contributed by Steve Loughran
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