[SMXCOMP-328] FTP poller stalls with threads waiting on PlainSocketImpl.socketAccept()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.1, servicemix-ftp-2008.01
• Component/s: servicemix-ftp
• Assignee: Unassigned
• Reporter: Gert Vanthienen
• Created: 03/Apr/07 07:17
• Updated: 14/Feb/09 22:56
• Resolved: 23/Nov/07 09:16

Description

FTP poller threads stop working with the stack trace below, causing the FTP client pool to run out of connections

Name: pool-component.servicemix-ftp-thread-2
State: RUNNABLE
Total blocked: 78,430  Total waited: 4,771

Stack trace: 
    java.net.PlainSocketImpl.socketAccept(Native Method)
    java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
    java.net.ServerSocket.implAccept(ServerSocket.java:450)
    java.net.ServerSocket.accept(ServerSocket.java:421)
    org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:502)
    org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2390)
    org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2364)
    org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2141)
    org.apache.servicemix.ftp.FtpPollerEndpoint.pollFileOrDirectory(FtpPollerEndpoint.java:211)
    org.apache.servicemix.ftp.FtpPollerEndpoint.pollFileOrDirectory(FtpPollerEndpoint.java:203)
    org.apache.servicemix.ftp.FtpPollerEndpoint.poll(FtpPollerEndpoint.java:78)
    org.apache.servicemix.common.endpoints.PollingEndpoint$PollSchedulerTask$1.run(PollingEndpoint.java:155)
    edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
    edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
    java.lang.Thread.run(Thread.java:595)

See http://www.nabble.com/FTP-poller-stalls...-tf3490690s12049.html for more information