Apache Camel FTP 错误 [英] Apache Camel FTP error

问题描述

我正在编写一段代码，从 FTP 输入路由到 bean 进程，然后再路由到 FTP 输出.该过程大约需要 15 分钟才能完成，完成后，Camel 会尝试从 FTP 输入路由中删除输入文件.当前 FTP 服务器抛出错误:

I am working on a piece of code that routes from FTP input to a bean process and then to FTP output. The process takes about 15 minutes to complete and when it finishes, the Camel tries to delete a input file from FTP input route. Currently the FTP server throws an error:

13 Jan 2015 18:21:26 DEBUG org.apache.camel.component.file.remote.FtpOperations.deleteFile - Deleting file: ../flex-brazil/Portal_Forn/request_appr/364/NF_4.txt
13 Jan 2015 18:21:26  WARN org.slf4j.helpers.MarkerIgnoringBase.warn - Error during commit. Exchange[org.apache.camel.component.file.GenericFileMessage@3207779]. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - File operation failed: 421 Timeout (900 seconds): closing control connection.
FTP response 421 received.  Server closed connection.. Code: 421]
org.apache.camel.component.file.GenericFileOperationFailedException: File operation failed: 421 Timeout (900 seconds): closing control connection.
FTP response 421 received.  Server closed connection.. Code: 421
at org.apache.camel.component.file.remote.FtpOperations.getCurrentDirectory(FtpOperations.java:701)
at org.apache.camel.component.file.remote.FtpOperations.deleteFile(FtpOperations.java:224)
at org.apache.camel.component.file.strategy.GenericFileDeleteProcessStrategy.commit(GenericFileDeleteProcessStrategy.java:71)
at org.apache.camel.component.file.GenericFileOnCompletion.processStrategyCommit(GenericFileOnCompletion.java:124)
at org.apache.camel.component.file.GenericFileOnCompletion.onCompletion(GenericFileOnCompletion.java:80)
at org.apache.camel.component.file.GenericFileOnCompletion.onComplete(GenericFileOnCompletion.java:54)
at org.apache.camel.util.UnitOfWorkHelper.doneSynchronizations(UnitOfWorkHelper.java:100)
at org.apache.camel.impl.DefaultUnitOfWork.done(DefaultUnitOfWork.java:228)
at org.apache.camel.util.UnitOfWorkHelper.doneUow(UnitOfWorkHelper.java:61)
at org.apache.camel.processor.CamelInternalProcessor$UnitOfWorkProcessorAdvice.after(CamelInternalProcessor.java:613)
at org.apache.camel.processor.CamelInternalProcessor$UnitOfWorkProcessorAdvice.after(CamelInternalProcessor.java:581)
at org.apache.camel.processor.CamelInternalProcessor$InternalCallback.done(CamelInternalProcessor.java:240)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:173)
at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:401)
at org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:99)
at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:201)
at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:165)
at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:187)
at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:114)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.commons.net.ftp.FTPConnectionClosedException: FTP response 421 received.  Server closed connection.
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:367)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:483)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:608)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:582)
at org.apache.commons.net.ftp.FTP.pwd(FTP.java:1454)
at org.apache.commons.net.ftp.FTPClient.printWorkingDirectory(FTPClient.java:2658)
at org.apache.camel.component.file.remote.FtpOperations.getCurrentDirectory(FtpOperations.java:697)
... 25 more

有什么参数可以教Camel向FTP服务器发送keepalive来避免这种情况吗?

There are any parameter to teach the Camel to send keepalives to FTP server to avoid this situation?

推荐答案

我建议把整个过程分成两条路线:

I suggest to split the whole process into two routes:

1. Reader Route:只从 FTP 服务器读取文件.
2. 处理和写入路由:此路由处理传入的消息并向 FTP 服务器写入响应

优点是，读取和删除后连接会无一例外地关闭.当一条新消息将被写回服务器时，将创建一个新连接.

The advantage is, that the connection will be closed after reading and deleting without exception. When a new message will be written back to server a new connection will be created.

第一条路由只能关闭连接，当进程是异步的.为此，您可以使用队列进行读取和写入，例如seda 或 jms.

The first route can only close the connection, when the process is asynchronous. For this purpose you can use queues for reading and writing e.g. seda or jms.

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