apache-camel - Camel : File operation failed: Connection closed without indication. 。代码:421

Question

我在部署到 Tomcat 容器中的 Java 8 上使用 Camel 2.15.2 和 Apache Commons Net 3.3。

问题是，在处理完 200 多个文件(目录中超过 4000 个文件)后，路由始终停止，FTP 客户端断开连接，并注销以下消息:

[ogs.sharp-stream.com:21/root/] FtpConsumer                    WARN  Error processing file RemoteFile[route/to/file] due to File operation failed:  Connection closed without indication.. Code: 421. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - File operation failed:  Connection closed without indication.. Code: 421] 
org.apache.camel.component.file.GenericFileOperationFailedException: File operation failed:  Connection closed without indication.. Code: 421 
        at org.apache.camel.component.file.remote.FtpOperations.getCurrentDirectory(FtpOperations.java:713) 
        at org.apache.camel.component.file.remote.FtpOperations.retrieveFileToFileInLocalWorkDirectory(FtpOperations.java:440) 
        at org.apache.camel.component.file.remote.FtpOperations.retrieveFile(FtpOperations.java:310) 
        at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:384) 
        at org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:137) 
        at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:211) 
        at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:175) 
        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$RunnableAdapter.call(Executors.java:511) 
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) 
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
        at java.lang.Thread.run(Thread.java:745) 
Caused by: org.apache.commons.net.ftp.FTPConnectionClosedException: Connection closed without indication. 
        at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:317) 
        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:709) 
        ... 15 more 

This is the URI在相关路线的开头使用。

从 URI 可以看出，我还使用了 FileIdempotentRepository。是这样定义的

            <property name="fileStore" value="target/fileidempotent/.filestore1.dat" />

            <property name="maxFileStoreSize" value="512000" />

            <property name="cacheSize" value="250" />
    </bean>

知道为什么在所有文件都处理完之前连接可能会关闭吗？

Answer 1

你需要在你的 ftp/ftps url 中添加以下参数

disconnect=true

这将导致在传输文件后断开与远程主机的连接，并在再次触发路由时尝试建立新的连接。(而不是使用陈旧的，它可能已被远程主机/防火墙关闭)