执行MapReduce的Jar包报错：Exception in thread main ExitCodeException exitCode=1-CFANZ编程社区

执行MapReduce的Jar包报错：Exception in thread main ExitCodeException exitCode=1

一、实验环境
二、报错信息
三、解决方法：
四、另外一个问题
五、参考资料：

一、实验环境

CentOS7.5
Hadoop3.1.3
伪分布式模式
IDEA

二、报错信息

1.执行MapReduce的Jar包报错：Exception in thread main ExitCodeException exitCode=1 chmod 无法访问tmphadoopmapredstagingzhangsan1447658824.stagingjob_local1447658824_0001 没有那个文件或目录

执行MapReduce的Jar包报错：Exception in thread main ExitCodeException exitCode=1_大数据

文件已经确定是存在的

2.根据报错信息，推断是权限问题，将Hadoop安装目录下的tmp目录权限改为777

# 先进入到Hadoop安装目录
chmod 777 ./tmp

但是这个方法并没有解决该报错

3.查找网上，有提到关于HDFS默认的group是超级用户组supergroup，需要更改为当前用户。相关操作见三三、解决方法

三、解决方法：

在Hadoop的Web界面可以看到group的权限是supergroup，将普通用户增加到HDFS的超级用户组supergroup

1.步骤

先切换到root用户

提前查看supergroup相关信息

[root@hadoop112 zhangsan]# group supergroup /etc/group

bash: group: 未找到命令...

继续过滤查找

[root@hadoop112 zhangsan]#grep supergroup /etc/group

没有输出结果

增加supergroup组

[root@hadoop112 zhangsan]#groupadd supergroup

再次过滤查找

[root@hadoop112 zhangsan]#grep supergroup /etc/group

supergroup:x:1001:

将当前用户增加到supergroup组

[root@hadoop112 zhangsan]# usermod -a -G supergroup zhangsan

查看用户是否成功添加到supergroup组

[root@hadoop112 zhangsan]# id zhangsan

uid=1000(zhangsan) gid=1000(zhangsan) 组=1000(yzhangsanoona),1001(supergroup)

刷新用户到组的映射信息

[root@hadoop112 zhangsan]# hdfs dfsadmin -refreshUserToGroupsMappings

Refresh user to groups mapping successful

切换到普通用户

[root@hadoop112 zhangsan]# su zhangsan

[root@hadoop112 zhangsan]# hdfs dfsadmin -report

Configured Capacity: 38966558720 (36.29 GB) Present Capacity: 25293688832 (23.56 GB) DFS Remaining: 25293635584 (23.56 GB) DFS Used: 53248 (52 KB) DFS Used%: 0.00% Replicated Blocks: Under replicated blocks: 0 Blocks with corrupt replicas: 0 Missing blocks: 0 Missing blocks (with replication factor 1): 0 Low redundancy blocks with highest priority to recover: 0 Pending deletion blocks: 0 Erasure Coded Block Groups: Low redundancy block groups: 0 Block groups with corrupt internal blocks: 0 Missing block groups: 0 Low redundancy blocks with highest priority to recover: 0 Pending deletion blocks: 0

Live datanodes (1):

Name: 192.168.149.112:9866 (hadoop112) Hostname: hadoop112 Decommission Status : Normal Configured Capacity: 38966558720 (36.29 GB) DFS Used: 53248 (52 KB) Non DFS Used: 11669880832 (10.87 GB) DFS Remaining: 25293635584 (23.56 GB) DFS Used%: 0.00% DFS Remaining%: 64.91% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Thu May 12 23:07:35 CST 2022 Last Block Report: Thu May 12 22:59:14 CST 2022 Num of Blocks: 2