关于文件上传大小的限制

你好，我通过下载在这里提供的datax功能，执行python bin/datax.py job/xx.json这个命令上传文件到oss时，是不是会限制文件大小不能超过5G呢，现在我超过5G的文件就上传不了，我单独在linux服务器上执行这个命令，超过5G的文件是可以上传，但是我在java代码里面，通过这种调用方式，他就一直没有反应，请问是什么原因呢
String startCommand = "python " + dataxHomePath + "bin/datax.py " + xx.json;
Process pr = Runtime.getRuntime().exec(startCommand);

Start with the reported command, bin/datax.py job/xx.json, and the Java Runtime.exec call. Reproduce the difference between running the command directly on Linux and launching it from Java with a file larger than 5G, then inspect the process behavior and DataX output. Done means the upload-size behavior and the reason for the Java invocation hanging are identified and documented.

Written by the indexing model from the issue text.