scwhittle opened a new pull request, #25300:
URL: https://github.com/apache/beam/pull/25300
ThreadPoolExecutor creates a new thread if offer(Runnable) returns false.
With a SynchronousQueue under contention, this may return false even if there
are already idle threads in the pool. To avoid creating a thread unnecessarily
and growing the pool we modify offer to wait with a small timeout of 100ms.
This may delay initial execution on the pool but that should be rare as it is
encountered only once the high-watermark is exceeded.
Also add a timeout to the non-core threads so that the pool reduces size.
Both of these changes are motivated to reduce memory usage due to per-thread
buffers in Beam and AvroCoder.
Add a test contending adds on the pool which previously showed the pool
growing beyond the necessary amount (ie created 104 threads when 100 is
sufficient).
**Please** add a meaningful description for your change here
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