Karol Koltun created CAMEL-12472:
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Summary: Downloading a large file with streamDownload and stepwise
timeOut
Key: CAMEL-12472
URL: https://issues.apache.org/jira/browse/CAMEL-12472
Project: Camel
Issue Type: Bug
Components: camel-ftp
Affects Versions: 2.21.0
Environment: Tested on:
* Camel versions: 2.17.0 and 2.21.0
* Ftp servers: plain vsftpd server, org.apache.ftpserver as a mock, Camel test
environment ftp.
* Files: depending on configuration from 1mb to 5mb file is vital for error to
happen.
Reporter: Karol Koltun
Attachments: 0001-FtpSimpleConsumeStreamingStepwiseTest.patch
*Downloading a file exceeding certain, system-dependent size with
streamDownload and stepwise options turned on hangs and causes timeout.*
I prepared a test which triggers the error. The patch file is pretty big, as I
had to make a file enough big to make the timeout happen. Basing on my
predictions, the size of the file triggering the error depends on FTP
configuration and Java caching policy (no proof available yet). Working with
plain Vsftpd server even 1mb files triggered timeouts. In the test environment
the limit on my desktop is 5 mb. If the test passes, please make the file
bigger.
My intepretation of the problem:
# Start downloading a file with size exceeding InputStream cache (on my pc
approx. 1mb is the limit).
[FtpOperations.java:373|https://github.com/apache/camel/blob/dc6caa696255240a2a27c3bf229fc3aac9014401/components/camel-ftp/src/main/java/org/apache/camel/component/file/remote/FtpOperations.java#L423]
{code:java}
InputStream is = this.client.retrieveFileStream(remoteName);
{code}
# The server responds 150 and opens data connection.
{code:java}
[user_ftp] FTP response: Client "127.0.0.1", "150 Opening BINARY mode data
connection for x (1048576 bytes)."
{code}
# The data connection does not end because InputStream is waiting for reads
and it has not cached whole file. No "226 Transfer complete" response from
server.
# Try to change directory as stepwise is turned on.
[FtpOperations.java:387|https://github.com/apache/camel/blob/dc6caa696255240a2a27c3bf229fc3aac9014401/components/camel-ftp/src/main/java/org/apache/camel/component/file/remote/FtpOperations.java#L443]
{code:java}
this.changeCurrentDirectory(currentDir);
{code}
# Camel hangs as the server is still in the data connection and we are waiting
for response from CWD command.
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