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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (POOL-347) borrowObject waits for maxWaitMillis over in pool full
Date Fri, 20 Jul 2018 17:07:00 GMT

    [ https://issues.apache.org/jira/browse/POOL-347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16550993#comment-16550993
] 

ASF GitHub Bot commented on POOL-347:
-------------------------------------

Github user coveralls commented on the issue:

    https://github.com/apache/commons-pool/pull/10
  
    
    [![Coverage Status](https://coveralls.io/builds/18088758/badge)](https://coveralls.io/builds/18088758)
    
    Coverage increased (+0.1%) to 85.146% when pulling **7b3a83479ea3d57c624aa1ecd0260b86b12272de
on sunsuk7tp:POOL-347** into **3e6dfcd61ddcd88b18934738ebda05c84c948a80 on apache:master**.



> borrowObject waits for maxWaitMillis over in pool full
> ------------------------------------------------------
>
>                 Key: POOL-347
>                 URL: https://issues.apache.org/jira/browse/POOL-347
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 2.4.3, 2.5.0, 2.6.0
>            Reporter: Shunsuke Nakamura
>            Priority: Critical
>
> Since POOL-303's [fix|https://github.com/apache/commons-pool/commit/a4c544a24242701673073d32d2ddbf037fac0099],
even if we specify maxWaitMillis, object creation continues waiting for longer time without
any hard limit at [this line|https://git.linecorp.com/LINE-Server/apache-commons-pool2/commit/a4c544a24242701673073d32d2ddbf037fac0099#diff-39748305ad0db35f23449745d04c89fbR1046].

> Here's the actual stacktrace:
> {code}
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0x0000000741158358> (a java.lang.Object)
> 	at java.lang.Object.wait(Object.java:502)
> 	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:848)
> 	- locked <0x0000000741158358> (a java.lang.Object)
> 	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:417)
> 	at org.apache.commons.pool2.impl.TestGenericObjectPool.testReturnBorrowObjectWithingMaxWaitMillis(TestGenericObjectPool.java:2658)
> {code}
> As example of this issue, 
> we use Jedis2.9 with commons-pool 2.4.3 and maxWaitMillis=500ms in our environment.
> However, when master node is down and Pool is full, successor JedisConnections for dead
master wait at the line forever until pool is free. 
> Therefore, aborting old connections takes 40 ~ 80 sec.
> In order to avoid such situations, we should set hard limit to wait by reusing maxWaitMillis
or another value.  



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