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http://jira.qos.ch/browse/LBCORE-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=11830#action_11830
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Ceki Gulcu commented on LBCORE-168:
-----------------------------------
Hi Alex,
What do you mean exactly by "we switch the owner of the storage device" ?
> Locking issues when prudent logging to a (windows) clustered storage device
> on owner-switch
> -------------------------------------------------------------------------------------------
>
> Key: LBCORE-168
> URL: http://jira.qos.ch/browse/LBCORE-168
> Project: logback-core
> Issue Type: Bug
> Components: Appender
> Affects Versions: 0.9.24
> Environment: Windows Server 2003 Enterprise edition
> Reporter: alex
> Assignee: Logback dev list
> Priority: Blocker
>
> We have a clustered windows environment (2 nodes) and each node is logging to
> the same file which is stored on a clustered storage device (prudent is set
> to true)
> Logging works great until we switch the owner of the storage device where the
> logs are being written to at which point one of two things happens:
> - one or both servers go into a sort of deadlock state, meaning the code that
> logs just hangs indefinatly. it seems the safeWrite() in FileAppender may be
> to blame because of the "lock()" statement (note that a jvm reboot will fix
> this problem). I have been able to reproduce this locked state and verify
> that it is the lock() by trying to get a lock on the log file in the same jvm
> but without using logback code. This code will hang as well.
> - if there is no deadlock, any log written after the switch will just vanish
> into thin air (I have no idea where the outputstream points to when you start
> switching the owner)
> I have no idea how this can be fixed without resorting to a reload/reboot of
> our servers (which is not an option in production).
> We used to log synchronously, but then each thread that called logback would
> hang resulting in a massive amount of idling threads, so now we log
> asynchronously (this was already an option in the system we built around it)
> which gives us one advantage: we never write concurrently to the same file,
> although different nodes may write serially.
> As a temporary work around I am thinking to implement a simple appender that
> opens/closes the outputstream for each write (performance is less of an
> issue) and that does not implement locking.
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