我正在尝试执行一个pig语句，它显示txt文件中的数据，我正在mapreduce模式下运行，但是我遇到了一个错误，请有人帮我解决这个问题！！

[root@master ~]# pig -x mapreduce
    17/04/19 17:42:34 INFO pig.ExecTypeProvider: Trying ExecType : LOCAL
    17/04/19 17:42:34 INFO pig.ExecTypeProvider: Trying ExecType : MAPREDUCE
    17/04/19 17:42:34 INFO pig.ExecTypeProvider: Picked MAPREDUCE as the ExecType
    2017-04-19 17:42:34,853 [main] INFO  org.apache.pig.Main - Apache Pig version 0.16.0 (r1746530) compiled Jun 01 2016, 23:10:49
    2017-04-19 17:42:34,853 [main] INFO  org.apache.pig.Main - Logging error messages to: /root/pig_1492603954851.log
    2017-04-19 17:42:34,907 [main] INFO  org.apache.pig.impl.util.Utils - Default bootup file /root/.pigbootup not found
    2017-04-19 17:42:36,060 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://localhost
    2017-04-19 17:42:37,130 [main] INFO  org.apache.pig.PigServer - Pig Script ID for the session: PIG-default-f60d05c3-9fee-4624-9aa8-07f1584e6165
    2017-04-19 17:42:37,130 [main] WARN  org.apache.pig.PigServer - ATS is disabled since yarn.timeline-service.enabled set to false
    grunt> dump b;
    2017-04-19 17:42:41,135 [main] ERROR org.apache.pig.tools.grunt.Grunt - You don't have permission to perform the operation. Error from the server: org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=EXECUTE, inode="/tmp/temp1549818457":dead:supergroup:drwx------
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:319)
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkTraverse(FSPermissionChecker.java:259)
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:205)
        at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:190)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1720)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1704)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkTraverse(FSDirectory.java:1692)
        at org.apache.hadoop.hdfs.server.namenode.FSDirMkdirOp.mkdirs(FSDirMkdirOp.java:60)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:3894)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.mkdirs(NameNodeRpcServer.java:983)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.mkdirs(ClientNamenodeProtocolServerSideTranslatorPB.java:622)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

    2017-04-19 17:42:41,136 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1066: Unable to open iterator for alias b
    Details at logfile: /root/pig_1492603954851.log