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From "ArtemGr (JIRA)" <j...@apache.org>
Subject [jira] Commented: (FTPSERVER-403) FTP would periodically hang in MDC
Date Mon, 07 Mar 2011 13:08:59 GMT

    [ https://issues.apache.org/jira/browse/FTPSERVER-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003342#comment-13003342
] 

ArtemGr commented on FTPSERVER-403:
-----------------------------------

P.S. This is an old bug, I encountered it periodically for at least a year.

> 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
>         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)
> The only MDC-related code that our application adds is the following in the UserManager.authenticate
implementation:
>             Map context = MDC.getCopyOfContextMap();
>             if (context != null) System.out.println ("FTP user logged in: " + context);
>             return user; 
> Seems like a synchronization issue to me.

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