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From "ArtemGr (JIRA)" <j...@apache.org>
Subject [jira] Created: (FTPSERVER-403) FTP would periodically hang in MDC
Date Mon, 07 Mar 2011 13:08:59 GMT
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: 1.0.5, 1.0.4, 1.0.3
         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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