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https://issues.apache.org/activemq/browse/CAMEL-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-3134.
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Fix Version/s: 2.5.0
Resolution: Fixed
trunk: 998603.
Thanks for reporting. I have committed a fix which closes the stream and
deletes the temp file.
Can you test it out on your system?
You can use a PollingConsumerPollStrategy as the logic to retry in case the
poll failed.
> FTP poller seems to hang if it has connection issues in the middle of
> downloading a file
> ----------------------------------------------------------------------------------------
>
> Key: CAMEL-3134
> URL: https://issues.apache.org/activemq/browse/CAMEL-3134
> Project: Apache Camel
> Issue Type: Improvement
> Components: camel-ftp
> Affects Versions: 2.4.0
> Environment: JDK 1.6 on windows and linux
> Reporter: Tim Cull
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 2.5.0
>
>
> When connecting to a somewhat unstable FTP server, I occasionally have issues
> where the FTP poller dies (for all practical purposes because it stops
> polling, not sure what state it's actually in) if it encounters a connection
> issue in the middle of downloading a file. At the bottom of this issue is an
> example stack trace from when this issue occurs.
> I believe the exception is caused by a network-level issue with the
> connection to the remote FTP server. This belief is based on the comment by
> Guy Rouillier in this issue:
> https://issues.apache.org/jira/browse/NET-160
> The best fix is probably to put some retry logic in
> org.apache.camel.component.file.remote.FtpOperations.retrieveFileToFileInLocalWorkDirectory()
> such that if this line throws and exception:
> result = client.retrieveFile(onlyName, os);
> then it closes the local file output stream, deletes the local file (if
> there's anything there), disconnects from the FTP server, reconnects, and
> then tries the download again.
> [17/09/10 08:24:20:020 EDT] ERROR remote.FtpConsumer: Caused by:
> [org.apache.camel.component.file.GenericFileOperationFailedException - File
> operation failed
> : 125 Data connection open; transfer starting.
> IOException caught while copying.. Code: 125]
> org.apache.camel.component.file.GenericFileOperationFailedException: File
> operation failed: 125 Data connection open; transfer starting.
> IOException caught while copying.. Code: 125
> at
> org.apache.camel.component.file.remote.FtpOperations.retrieveFileToFileInLocalWorkDirectory(FtpOperations.java:310)
> at
> org.apache.camel.component.file.remote.FtpOperations.retrieveFile(FtpOperations.java:235)
> at
> org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:254)
> at
> org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:137)
> at
> org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:103)
> at
> org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:98)
> at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
> at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown
> Source)
> at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown
> Source)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown
> Source)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown
> Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
> Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> Caused by: org.apache.commons.net.io.CopyStreamException: IOException caught
> while copying.
> at org.apache.commons.net.io.Util.copyStream(Util.java:129)
> at
> org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1286)
> at
> org.apache.camel.component.file.remote.FtpOperations.retrieveFileToFileInLocalWorkDirectory(FtpOperations.java:307)
> ... 14 more
> [
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