The situation multi user submit workflows , occasionally, occur the HDFS visitor user become another one

The situation multi user submit workflows , occasionally, occur the HDFS visitor user become another one . for example, I need submit a workflow by proxy user "platform" via user oozie (kerberos) , an error occur in oozie source code  WorkflowAppService.readDefinition read workflow.xml.

2018-11-14 00:00:00,497 ERROR [CallableQueue-42]org.apache.oozie.command.wf.SubmitXCommand(517) USER[platform] GROUP[-] TOKEN[] APP[myBulkload-Scheduler-CS_TTL-1539689446] JOB[0002497-180928143722290-oozie-root-C] ACTION[0002497-180928143722290-oozie-root-C@1354] XException, org.apache.oozie.command.CommandException: E0710: Could not read the workflow definition, Permission denied: user=dbzq04, access=READ, inode="/phoebus/_fileservice/users/nsplatform/platform/workflows/DataLoadWF-1427-1129/workflow.xml":platform:supergroup:rw------

note: user  "dbzq04"  also submit some workflow at before, but current submit the workflow of user is user platform. In order to prove current user is platform , I insert some logs at oozie source code 

/**  org.apache.oozie.service.HadoopAccessorService   */
public FileSystem createFileSystem(String user, final URI uri, final Configuration   conf) throws HadoopAccessorException {
      //.........omit......
 try {
   UserGroupInformation ugi = getUGI(user);
   LOG.info("current user="+ugi);  //------ my insert log, to print proxy ugi info
   return ugi.doAs(new PrivilegedExceptionAction<FileSystem>() {
   public FileSystem run() throws Exception {
    FileSystem fs = FileSystem.get(uri, conf);
    //------ my insert log, to print fs inner ugi info
    if(fs instanceof DistributedFileSystem){
     LOG.info("hdfs client user, "+((DistributedFileSystem)fs).getClient().toString());
    }
    return fs;
   }
 });
 }catch (InterruptedException ex) {
   throw new HadoopAccessorException(ErrorCode.E0902, ex.getMessage(), ex);
 }catch (IOException ex) {
   throw new HadoopAccessorException(ErrorCode.E0902, ex.getMessage(), ex);
 }
}

my log print result follows:

2018-11-14 00:00:00,492 INFO [CallableQueue-42]org.apache.oozie.service.HadoopAccessorService(520) USER[platform] GROUP[-] TOKEN[] APP[myBulkload-Scheduler-CS_TTL-1539689446] JOB[0002497-180928143722290-oozie-root-C] ACTION[0002497-180928143722290-oozie-root-C@1354] current user=platform (auth:PROXY) via oozie/nsplatformhm@DC1.FH.COM (auth:KERBEROS)
2018-11-14 00:00:00,493 INFO [CallableQueue-42]org.apache.oozie.service.HadoopAccessorService(520) USER[platform] GROUP[-] TOKEN[] APP[myBulkload-Scheduler-CS_TTL-1539689446] JOB[0002497-180928143722290-oozie-root-C] ACTION[0002497-180928143722290-oozie-root-C@1354] hdfs client user, DFSClient[clientName=DFSClient_NONMAPREDUCE_-515910437_325, ugi=platform (auth:PROXY) via oozie/nsplatformhm@DC1.FH.COM (auth:KERBEROS)]

over above the proves Indicate at visited HDFS path of user has been altered,  where did user "dbzq04"  come from? please help me check this problem--**