I failed to run the ranger-admin command and couldn't find any error messages in log file after set ranger.service.http.connector.attrib.maxHeaderCount=aa(string value) in ranger-admin-site.xml file. I analyzed the source codes and found the reason.
I found there are two questions after check the source codes in EmbeddedServer.java.
1. No exception pop out when called Integer.parseInt() and Long.parseLong() function. Once abnormal, the program aborted directly without log.
2. The catch captures anomaly without log in the loadConfig function. It only calls e.printStackTrace() function.
Currently the program will be aborted when the exception occured. We should get the default value instead of aborted.
We have tested our patch strictly.