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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-3031) Time Synchronization Solution
Date Thu, 22 Sep 2011 21:53:26 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112945#comment-13112945
] 

Timothy Bish commented on AMQ-3031:
-----------------------------------

It seems like a simple solution would be to remove the 'executePeriodically' function and
just have the 'schedualPeriodically' called for all scheduled tasks as that uses fixed-delay
execution instead of fixed-rate which is prone to stacking when tasks are delayed or in the
reporters case the clock is changed.  

> Time Synchronization Solution
> -----------------------------
>
>                 Key: AMQ-3031
>                 URL: https://issues.apache.org/jira/browse/AMQ-3031
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.4.1
>            Reporter: Erkan
>            Priority: Critical
>             Fix For: 5.6.0
>
>         Attachments: Scheduler-ActivemqCore.java, Scheduler-KahaDB.java
>
>
> We had a Problem if we synchronize the time of 1.1.2000 to the actual date. The cpu load
increase to 170% over a long time period. We analyse the problem and find out that is a java
timer problem. We pass the classes Scheduler.java in following packages:
> 1. \kahadb\src\main\java\org\apache\kahadb\util
> 2. activemq-core\src\main\java\org\apache\activemq\thread
> We change the TimerTask by ScheduledThreadPoolExecutor. That was the solution. I want
to discuss if that is the right solution or not. Can you analyze the classes and say if that
is the right way or not? If not can you propose a solution. If yes can you release that with
the next version.

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