mackrorysd commented on issue #1075: HADOOP-15729. [s3a] Allow core threads to time out. URL: https://github.com/apache/hadoop/pull/1075#issuecomment-510602515 Details of some performance testing of various approaches on the JIRA - dropping core threads had a slightly surprising drop in performance of 1GB uploads, which is why I decided to simply allow timeout instead of messing with the way the threads scale up. Have tested dropping core threads (by tweaking max threads) to a low number on a large cluster to verify it fixes the problem I was seeing. I didn't initially feel this was appropriate for a JUnit test because of the delays involved in ramping up the number of threads, letting them time out, etc. But I made it a scale test and updated the PR.
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