[HADOOP-16977] in javaApi, UGI params should be overidden through FileSystem conf

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.7.2, 3.2.0
• Component/s: security
• Assignee: Unassigned
• Reporter: Hongbing Wang
• Created: 13/Apr/20 02:33
• Updated: 21/Apr/20 14:19
• Resolved: 17/Apr/20 14:47

Description

org.apache.hadoop.security.UserGroupInformation#ensureInitialized,will always get the configure from the configuration files. Like below：

private static void ensureInitialized() {
  if (conf == null) {
    synchronized(UserGroupInformation.class) {
      if (conf == null) { // someone might have beat us
        initialize(new Configuration(), false);
      }
    }
  }
}

So that, if FileSystem is created through FileSystem#get or FileSystem#newInstance with conf, the conf values different from the configuration files will not take effect in UserGroupInformation.  E.g:

Configuration conf = new Configuration();
conf.set("k1","v1");
conf.set("k2","v2");
FileSystem fs = FileSystem.get(uri, conf);

"k1" or "k2" will not work in UserGroupInformation.