How can I configure Apache FTPFileSystem java class to use FTPSClient instead of the FTPClient
FTPFileSystem does not support FTPS. It cannot create FTPSClient.
You should have to create your own implementation of FileSystem based on FTPFileSystem (changing implementation of open), where you initialize the client as FTPSClient not FTP client. i.e:
FTPSClient client = new FTPSClient();
You can associate it with ftps:// URLs using:
conf.set("fs.ftps.impl", "com.myproject.MyFTPSFileSystem");And you might need to set below property for the client to enter local passive mode:
conf.set("fs.ftp.data.connection.mode", "PASSIVE_LOCAL_DATA_CONNECTION_MODE");