private Set<String> getUsersWithGlobalReadAction() throws IOException {
    return getUsersWithReadAction(PermissionStorage.getGlobalPermissions(conf));
  }
Return users with global read permission
@return users with global read permission
@throws IOException if an error occurred
hbase-server/src/main/java/org/apache/hadoop/hbase/security/access/SnapshotScannerHDFSAclHelper.java