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From "zhu chen (JIRA)" <>
Subject [jira] [Commented] (POOL-350) Add option for not executing "hasBorrowWaiters()" while returning objects
Date Mon, 29 Oct 2018 03:58:00 GMT


zhu chen commented on POOL-350:

exactly,@ [~struberg].

I would appreciate it if you could considering about my idea.


I understand the idea that 'hasBorrowWaiters()' is working for the most hot/busy keyed objects,
so that the local setting (max object per key) for the hottest key runs exhausted before the
global setting(max object total). But it might be a good idea to also make the operation

> Add option for not executing "hasBorrowWaiters()" while returning objects
> -------------------------------------------------------------------------
>                 Key: POOL-350
>                 URL:
>             Project: Commons Pool
>          Issue Type: New Feature
>    Affects Versions: 2.6.0
>         Environment: h5. uname -a:
> Linux VMS26239 3.10.0-229.11.1.el7.x86_64 #1 SMP Thu Aug 6 01:06:18 UTC 2015 x86_64 x86_64
x86_64 GNU/Linux
> *Java version:*
> java version "1.8.0_60"
> Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
> Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
>            Reporter: zhu chen
>            Priority: Critical
>              Labels: easyfix
> h2. Phenomena:
> I'm recently leveraging commons-pool as my Redis connection pool in my project, however,
the pain is that when my system is dealing with over thousands of Redises,  CPU load become
such high. By checking JVM through JFR(FlightRecorder), it turned out the hot method was "{color:#FF0000}hasBorrowWaiters(){color}",
which is invoked by "{color:#FF0000}returnObject(){color}" each time.
> That means the system will go through over *thousands*(the number will grow as well as
my system) of keys after *each* object's *return*, what's worse, the program is running concurrently,
which, obviously cause a huge CPU load.
> h2. Expect:
> I was wondering if we could add a config for optionally run this "hasBorrowWaiters()"
each time when we return an object.

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