[HBASE-25547] Thread pools should release unused resources - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Minor
Resolution: Fixed
Affects Version/s: 3.0.0-alpha-1, 1.7.0, 2.5.0
Fix Version/s: 2.5.0, 3.0.0-alpha-2
Component/s: master, regionserver
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Description

On this PR Michael Stack rightly pointed out that the thread pool just spins up threads that remain idle for 99.999% of time. Java's ThreadPoolExecutor lets us tune some configurations like the following for releasing the unused resources

corePoolSize
keepAliveTimeMs
allowCoreThreadTimeOut

Current code makes it difficult to pass along these configurations to the executor service. Refactor and fix the defaults for low-priority thread pools to release resources quicker.