Add ability to configure threads at least in PubSub and where appropriate #1683
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Issues related to the Pub/Sub API.Issues related to the Pub/Sub API.Moderately-important priority. Fix may not be included in next release.Moderately-important priority. Fix may not be included in next release.‘Nice-to-have’ improvement, new feature or different behavior or design.‘Nice-to-have’ improvement, new feature or different behavior or design.
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Currently, PubSub Subscriber creates multiple threads based on Runtime.availableProcessors(). This is a reasonable default but should be configurable, specifically when there are other competing threads pools, and also when running in Docker containers, where Runtime.availableProcessors() may not return the allocated CPUs (see https://bugs.openjdk.java.net/browse/JDK-6515172)