Spark load about broker.username and HADOOP_USER_NAME is invalid

[hanson2021]

Doris version: 0.14
Hadoop version: CDH6.3.2
Spark version:2.4.6
I created a spark load resource with
CREATE EXTERNAL RESOURCE r_spark_cdh6
PROPERTIES
(
"type"="spark",
"spark.master"="yarn",
"spark.submit.deployMode"="cluster",
...
"broker"="broker11",
"broker.username"="hive",
"broker.password"=""
）

Why still use root to read hdfs files ？ the errors as following:

cluster:r_spark_cdh6; timeout(s):259200; max_filter_ratio:0.0 | type:ETL_RUN_FAIL; msg:errCode = 2, detailMessage = spark etl job failed. msg: Permission denied: user=root, access=READ, inode="/thdw/warehouse/test.db/doris_text_t1/000000_0":hive:hive:-rwxrwx--x
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:400)
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:262)
        at org.apache.sentry.hdfs.SentryINodeAttributesProvider$SentryPermissionEnforcer.checkPermission(SentryINodeAttributesProvider.java:86)
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:194)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1855)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1839)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPathAccess(FSDirectory.java:1789)
        at org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getBlockLocations(FSDirStatAndListingOp.java:154)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:1909)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:735)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:415)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1875)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675)