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https://issues.apache.org/jira/browse/FTPSERVER-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140608#comment-13140608
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Ceki Gulcu commented on FTPSERVER-403:
--------------------------------------
SLF4J bug 203 will be fixed shortly.
> FTP would periodically hang in MDC
> ----------------------------------
>
> Key: FTPSERVER-403
> URL: https://issues.apache.org/jira/browse/FTPSERVER-403
> Project: FtpServer
> Issue Type: Bug
> Components: Core, Server
> Affects Versions: 1.0.3, 1.0.4, 1.0.5, 1.0.6
> Environment: Encountered it both on Linux and FreeBSD, both on Sun
> JVM 1.6 and OpenJDK 6.
> Reporter: ArtemGr
>
> FTP works fine for the most time but once in a while (depended on how often
> the FTP is used) it would hang, consuming 100% CPU, in
> java.util.HashMap.removeEntryForKey (HashMap.java:586)
> java.util.HashMap.remove (HashMap.java:555)
> org.slf4j.helpers.BasicMDCAdapter.remove (BasicMDCAdapter.java:91)
> org.slf4j.MDC.remove (MDC.java:156)
> org.apache.mina.filter.logging.MdcInjectionFilter.filter
> (MdcInjectionFilter.java:141)
> org.apache.mina.filter.util.CommonEventFilter.messageSent
> (CommonEventFilter.java:75)
>
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageSent
> (DefaultIoFilterChain.java:462)
> org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300
> (DefaultIoFilterChain.java:46)
>
> org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageSent
> (DefaultIoFilterChain.java:802)
> org.apache.mina.filter.codec.ProtocolCodecFilter.messageSent
> (ProtocolCodecFilter.java:287)
>
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageSent
> (DefaultIoFilterChain.java:462)
> org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300
> (DefaultIoFilterChain.java:46)
>
> org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageSent
> (DefaultIoFilterChain.java:802)
> org.apache.mina.core.filterchain.IoFilterEvent.fire
> (IoFilterEvent.java:80)
> org.apache.mina.core.session.IoEvent.run (IoEvent.java:63)
>
> org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTask
> (OrderedThreadPoolExecutor.java:780)
>
> org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTasks
> (OrderedThreadPoolExecutor.java:772)
> org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.run
> (OrderedThreadPoolExecutor.java:714)
> java.lang.Thread.run (Thread.java:636)
> Seems like a synchronization issue to me.
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