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From "Stefan Egli (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SLING-7407) A thread pool with min size 1 uses only 1 thread for processing
Date Mon, 22 Jan 2018 14:38:00 GMT

    [ https://issues.apache.org/jira/browse/SLING-7407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332464#comment-16332464
] 

Stefan Egli edited comment on SLING-7407 at 1/22/18 2:37 PM:
-------------------------------------------------------------

good point, [lowered to info|https://github.com/apache/sling-org-apache-sling-commons-threads/commit/d91ee5fa57b2d8f2f9738d377663bc2f97f1aa59],
perhaps useful to have at info for visibility as we're changing a user's config.


was (Author: egli):
good point, [lowered to info|https://github.com/apache/sling-org-apache-sling-commons-threads/commit/ea49cff1ce0d2f3e00fbf16d3b0d35e1b39a6a12],
perhaps useful to have at info for visibility as we're changing a user's config.

> 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: Bug
>          Components: Commons
>            Reporter: Chetan Mehrotra
>            Assignee: Stefan Egli
>            Priority: Major
>             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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