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From "StevenXi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LOG4NET-510) FileAppender.InterProcessLock.AcquireLock blocks everything
Date Thu, 14 Apr 2016 08:29:25 GMT

     [ https://issues.apache.org/jira/browse/LOG4NET-510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

StevenXi updated LOG4NET-510:
-----------------------------
    Description: 
There's a chance InterProcessLock.AcquireLock hangs, and lots of Appender.AppenderSkeleton.DoAppend
threads queued.

It happens to our service every 2 days, all happen after mid-night. So after a new log file
created, few new line in the file added. But not always happens.

As there're hundreds of Appender.AppenderSkeleton.DoAppend threads queued, it blocks everywhere
in the service that uses log4net.

log4net is supposed to be 'failure-free' or at least fails quietly, not block the whole application.

config uses
<lockingModel type="log4net.Appender.FileAppender+InterProcessLock" />


So far it has hanged for few (8+) hours already.

  was:
There's a chance InterProcessLock.AcquireLock hangs, and lots of Appender.AppenderSkeleton.DoAppend
threads queued.

It happens to our service every 2 days, all happen after mid-night. So after a new log file
created, few new line in the file added. But not always happens.

As there're hundreds of Appender.AppenderSkeleton.DoAppend threads queued, it blocks everywhere
in the service that uses log4net.

log4net is supposed to be 'failure-free' or at least fails quietly, not block the whole application.

config uses
<lockingModel type="log4net.Appender.FileAppender+InterProcessLock" />

Debug threads window looks like below: (there're more, but not pasted all here)

Not Flagged		1784	22	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged	>	2904	14	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.FileAppender.InterProcessLock.AcquireLock
Normal
Not Flagged		2164	7	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		848	9	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1524	27	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1676	28	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2908	32	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2496	36	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2776	39	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		3036	33	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1200	13	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		684	43	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2804	45	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2156	47	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		864	41	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2224	50	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		3044	53	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2000	56	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2536	58	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1448	61	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1828	55	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1604	64	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		252	66	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2896	71	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2428	73	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2888	76	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		632	69	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		3048	34	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2732	25	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1992	5	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2232	72	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2100	65	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		532	67	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		1596	60	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		260	51	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2720	46	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2444	49	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
Not Flagged		2040	19	Worker Thread	Worker Thread	log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend
Normal
...


> FileAppender.InterProcessLock.AcquireLock blocks everything
> -----------------------------------------------------------
>
>                 Key: LOG4NET-510
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-510
>             Project: Log4net
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 1.2.13
>         Environment: Windows 2012
>            Reporter: StevenXi
>            Priority: Critical
>         Attachments: screenshot-1.png
>
>
> There's a chance InterProcessLock.AcquireLock hangs, and lots of Appender.AppenderSkeleton.DoAppend
threads queued.
> It happens to our service every 2 days, all happen after mid-night. So after a new log
file created, few new line in the file added. But not always happens.
> As there're hundreds of Appender.AppenderSkeleton.DoAppend threads queued, it blocks
everywhere in the service that uses log4net.
> log4net is supposed to be 'failure-free' or at least fails quietly, not block the whole
application.
> config uses
> <lockingModel type="log4net.Appender.FileAppender+InterProcessLock" />
> So far it has hanged for few (8+) hours already.



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