Payal created NET-690:
-------------------------
Summary: Performance issue when using the FTPClient to retrieve
files from z/OS and z/VM
Key: NET-690
URL: https://issues.apache.org/jira/browse/NET-690
Project: Commons Net
Issue Type: Bug
Components: FTP
Affects Versions: 3.7,1
Environment: {code:java}
Java 8, FTP server on z/OS | z/VM{code}
Reporter: Payal
Fix For: 3.7.2
Performance issue when using the FTPClient to retrieve files from z/OS and
z/VMPerformance issue when using the FTPClient to retrieve files from z/OS and
z/VM
There is a significant performance drop off when using the FTPClient to
retrieve files from z/OS and z/VM ( I haven't tested against other operating
systems). If I switch to using the FTPSClient I don't see the same problem.
The following is the command output when doing a retrieve of a file from z/OS
which is only 2.0KB in size:
*FTPClient:*
2020-10-07 08:30:46.261 SENT>>> RETR
2020-10-07 08:30:46.291 RECD<<< 125 Sending data set TEST.FTP(PART11B) FIXrecfm
80
2020-10-07 08:32:46.342 RECD<<< 250 Transfer completed successfully.
*FTPSClient:*
2020-10-07 08:30:45.813 SENT>>> RETR
2020-10-07 08:30:45.843 RECD<<< 125 Sending data set TEST.FTP(PART11B) FIXrecfm
80
2020-10-07 08:30:46.014 RECD<<< 250 Transfer completed successfully.
The first transfer using the FTPClient took 2 minutes, which when switching to
using FTPS take less than a second. This has only been an issue since upgrading
from commons-net 3.6 to 3.7.1. It seems to consistently take 2 minutes transfer
pretty much regardless of the size of the file, so appears to be waiting on
something or hitting a timeout of some sort.
I have added the code I'm using to establish the FTPClient and connect to the
host and to retrieve the file.
{code:java}
//Establish the FTPClient and connect to the host
private FTPClient getFTPClient(String host, String userProperty, String
passwordProperty) throws SocketException, IOException {
FTPClient client = new FTPClient();
client.addProtocolCommandListener(this);
client.connect(host);
client.login(getProperties().getProperty(userProperty),
getProperties().getProperty(passwordProperty));
client.enterLocalPassiveMode();
return client;
}
//Retrieve file
private void getFile(String remoteDir,String localDir, String file,
FTPClient client) throws IOException, FileNotFoundException {
client.changeWorkingDirectory(remoteDir);
client.setFileType(FTP.BINARY_FILE_TYPE);
BufferedOutputStream bo = new BufferedOutputStream(new
FileOutputStream(localDir + file));
client.retrieveFile(file, bo);
bo.close();
}
{code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
