[jira] [Created] (SLING-7407) A thread pool with min size 1 uses only 1 thread for processing

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

Chetan Mehrotra created SLING-7407:
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             Summary: A thread pool with min size 1 uses only 1 thread for processing
                 Key: SLING-7407
                 URL: https://issues.apache.org/jira/browse/SLING-7407
             Project: Sling
          Issue Type: Improvement
          Components: Commons
            Reporter: Chetan Mehrotra
             Fix For: Commons Threads 3.2.12


If a thread pool is configured like below

{noformat}
 org.apache.sling.commons.threads.impl.DefaultThreadPool.factory-oak
    name="oak"
    minPoolSize=I"1"
    maxPoolSize=I"5"
{noformat}

Then only 1 thread would be used even if multiple jobs are assigned to the pool. This happens because of strange behaviour of Java [ThreadPoolExecutor|https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html]

bq. If there are more than corePoolSize but less than maximumPoolSize threads running, a new thread will be created only *if the queue is full*

With unbounded queue used this lead to current behaviour. As a fix Sling Thread Pool should adapt such a config 



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