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1.文档编写目的
本文档主要讲述如何使用Sentry对Hive外部表权限管理，并基于以下假设：
1.操作系统版本：RedHat6.5
2.CM版本：CM 5.11.1
3.集群已启用Kerberos和Sentry
4.采用具有sudo权限的ec2-user用户进行操作
2.前置准备
2.1创建外部表数据父目录
1.使用hive用户登录Kerberos
[root@ip-172-31-8-141 1874-hive-HIVESERVER2]# kinit -kt hive.keytab hive/[email protected]
[root@ip-172-31-8-141 1874-hive-HIVESERVER2]# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: hive/[email protected]
Valid starting Expires Service principal
09/01/17 11:10:54 09/02/17 11:10:54 krbtgt/[email protected]
renew until 09/06/17 11:10:54
[root@ip-172-31-8-141 1874-hive-HIVESERVER2]# 
2.创建HDFS目录
使用如下命令在HDFS的根目录下创建Hive外部表的数据目录/extwarehouse
[root@ip-172-31-8-141 ec2-user]# hadoop fs -mkdir /extwarehouse
[root@ip-172-31-8-141 ec2-user]# hadoop fs -ls /
drwxr-xr-x - hive supergroup 0 2017-09-01 11:27 /extwarehouse
drwxrwxrwx - user_r supergroup 0 2017-08-23 03:23 /fayson
drwx------ - hbase hbase 0 2017-09-01 02:59 /hbase
drwxrwxrwt - hdfs supergroup 0 2017-08-31 06:18 /tmp
drwxrwxrwx - hdfs supergroup 0 2017-08-30 03:48 /user
[root@ip-172-31-8-141 ec2-user]# hadoop fs -chown hive:hive /extwarehouse
[root@ip-172-31-8-141 ec2-user]# hadoop fs -chmod 771 /extwarehouse
[root@ip-172-31-8-141 ec2-user]# hadoop fs -ls /
drwxrwx--x - hive hive 0 2017-09-01 11:27 /extwarehouse
drwxrwxrwx - user_r supergroup 0 2017-08-23 03:23 /fayson
drwx------ - hbase hbase 0 2017-09-01 02:59 /hbase
drwxrwxrwt - hdfs supergroup 0 2017-08-31 06:18 /tmp
drwxrwxrwx - hdfs supergroup 0 2017-08-30 03:48 /user
[root@ip-172-31-8-141 ec2-user]# 
2.2配置外部表数据父目录的ACL同步
1.确保HDFS已开启sentry并启用ACL同步
2.配置sentry同步路径（2.1创建的Hive外部表数据目录）
3.配置完成，重启服务。
3.创建Hive外部表
1.使用beeline命令行连接hive，创建Hive外部表
建表语句：
create external table if not exists student(
name string,
age int,
addr string
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
LOCATION '/extwarehouse/student';终端操作：
[root@ip-172-31-8-141 1874-hive-HIVESERVER2]# beeline
Beeline version 1.1.0-cdh5.11.1 by Apache Hive
beeline> !connect jdbc:hive2://localhost:10000/;principal=hive/[email protected]
...
0: jdbc:hive2://localhost:10000/> create external table if not exists student(
. . . . . . . . . . . . . . . . > name string,
. . . . . . . . . . . . . . . . > age int,
. . . . . . . . . . . . . . . . > addr string
. . . . . . . . . . . . . . . . > )
. . . . . . . . . . . . . . . . > ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
. . . . . . . . . . . . . . . . > LOCATION '/extwarehouse/student';
...
INFO : OK
No rows affected (0.236 seconds)
0: jdbc:hive2://localhost:10000/> 
2.向student表中load数据
准备测试数据
[root@ip-172-31-8-141 student]# pwd
/home/ec2-user/student
[root@ip-172-31-8-141 student]# ll
total 4
-rw-r--r-- 1 root root 39 Sep 1 11:37 student.txt
[root@ip-172-31-8-141 student]# cat student.txt
zhangsan,18,guangzhou
lisi,20,shenzhen
[root@ip-172-31-8-141 student]# 
将student.txt文件put到hdfs的/tmp/student目录
[root@ip-172-31-8-141 student]# hadoop fs -mkdir /tmp/student
[root@ip-172-31-8-141 student]# ll
total 4
-rw-r--r-- 1 hive hive 39 Sep 1 11:37 student.txt
[root@ip-172-31-8-141 student]# hadoop fs -put student.txt /tmp/student
[root@ip-172-31-8-141 student]# hadoop fs -ls /tmp/student
Found 1 items
-rw-r--r-- 3 hive supergroup 39 2017-09-01 11:57 /tmp/stu
dent/student.txt
[root@ip-172-31-8-141 student]# 
在beeline命令行下，将数据load到student表
0: jdbc:hive2://localhost:10000/> load data inpath '/tmp/student' into table student;
...
INFO : Table default.student stats: [numFiles=1, totalSize=39]
INFO : Completed executing command(queryId=hive_20170901115858_5a76aa76-1b24-40ce-8254-42991856c05b); Time taken: 0.263 seconds
INFO : OK
No rows affected (0.41 seconds)
0: jdbc:hive2://localhost:10000/> 
执行完load命令后，查看表数据
0: jdbc:hive2://localhost:10000/> select * from student;
...
INFO : OK
+---------------+--------------+---------------+--+
| student.name | student.age | student.addr |
+---------------+--------------+---------------+--+
| zhangsan | 18 | guangzhou |
| lisi | 20 | shenzhen |
+---------------+--------------+---------------+--+
2 rows selected (0.288 seconds)
0: jdbc:hive2://localhost:10000/> 
4.使用fayson用户在beeline和impala-shell查看
使用fayson用户的principal初始化Kerberors的票据
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ kinit fayson
Password for [email protected]:
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ klist
Ticket cache: FILE:/tmp/krb5cc_500
Default principal: [email protected]
Valid starting Expires Service principal
09/01/17 12:27:39 09/02/17 12:27:39 krbtgt/[email protected]
renew until 09/08/17 12:27:39
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ 
4.1访问hdfs目录
[ec2-user@ip-172-31-8-141 ~]$ hadoop fs -ls /extwarehouse/student
ls: Permission denied: user=fayson, access=READ_EXECUTE, inode="/extwarehouse/student":hive:hive:drwxrwx--x
[ec2-user@ip-172-31-8-141 ~]$ 
4.2beeline命令行查看
[ec2-user@ip-172-31-8-141 ~]$ beeline
Beeline version 1.1.0-cdh5.11.1 by Apache Hive
beeline> !connect jdbc:hive2://localhost:10000/;principal=hive/[email protected]
...
INFO : OK
+-----------+--+
| tab_name |
+-----------+--+
+-----------+--+
No rows selected (0.295 seconds)
0: jdbc:hive2://localhost:10000/> select * from student;
Error: Error while compiling statement: FAILED: SemanticException No valid privileges
User fayson does not have privileges for QUERY
The required privileges: Server=server1->Db=default->Table=student->Column=addr->action=select; (state=42000,code=40000)
0: jdbc:hive2://localhost:10000/> 
4.3impala-shell命令行查看
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ impala-shell
...
[Not connected] > connect ip-172-31-10-156.ap-southeast-1.compute.internal:21000;
Connected to ip-172-31-10-156.ap-southeast-1.compute.internal:21000
Server version: impalad version 2.8.0-cdh5.11.1 RELEASE (build 3382c1c488dff12d5ca8d049d2b59babee605b4e)
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > show tables;
Query: show tables
ERROR: AuthorizationException: User '[email protected]' does not have privileges to access: default.*
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > select * from student;
Query: select * from student
Query submitted at: 2017-09-01 12:33:06 (Coordinator: http://ip-172-31-10-156.ap-southeast-1.compute.internal:25000)
ERROR: AuthorizationException: User '[email protected]' does not have privileges to execute 'SELECT' on: default.student
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > 
4.4测试总结
通过hive用户创建的外部表，未给fayson用户赋予student表读权限情况下，无权限访问hdfs的(/extwarehouse/student)数据目录，在beeline和impala-shell命令行下，fayson用户均无权限查询student表数据。
5.为fayson用户赋予student表读权限
注：以下操作均在hive管理员用户下操作
1.创建student_read角色
0: jdbc:hive2://localhost:10000/> create role student_read;
...
INFO : Executing command(queryId=hive_20170901124848_927878ba-0217-4a32-a508-bf29fed67be8): create role student_read
...
INFO : OK
No rows affected (0.104 seconds)
0: jdbc:hive2://localhost:10000/> 
2.将student表的查询权限授权给student_read角色
0: jdbc:hive2://localhost:10000/> grant select on table student to role student_read;
...
INFO : Executing command(queryId=hive_20170901125252_8702d99d-d8eb-424e-929d-5df352828e2c): grant select on table student to role student_read
...
INFO : OK
No rows affected (0.111 seconds)
0: jdbc:hive2://localhost:10000/> 
3.将student_read角色授权给fayson用户组
0: jdbc:hive2://localhost:10000/> grant role student_read to group fayson;
...
INFO : Executing command(queryId=hive_20170901125454_5f27a87e-2f63-46d9-9cce-6f346a0c415c): grant role student_read to group fayson
...
INFO : OK
No rows affected (0.122 seconds)
0: jdbc:hive2://localhost:10000/> 
6.再次测试
使用fayson用户登录Kerberos
6.1访问HDFS目录
访问student数据所在hdfs目录/extwarehouse/student
[ec2-user@ip-172-31-8-141 ~]$ hadoop fs -ls /extwarehouse/student
Found 1 items
-rwxrwx--x+ 3 hive hive 39 2017-09-01 14:42 /extwarehouse/student/student.txt
[ec2-user@ip-172-31-8-141 ~]$ 
6.2beeline查询student表
[ec2-user@ip-172-31-8-141 ~]$ klist
Ticket cache: FILE:/tmp/krb5cc_500
Default principal: [email protected]
Valid starting Expires Service principal
09/01/17 12:58:59 09/02/17 12:58:59 krbtgt/[email protected]
renew until 09/08/17 12:58:59
[ec2-user@ip-172-31-8-141 ~]$
[ec2-user@ip-172-31-8-141 ~]$ beeline
Beeline version 1.1.0-cdh5.11.1 by Apache Hive
beeline> !connect jdbc:hive2://localhost:10000/;principal=hive/[email protected]
...
INFO : OK
+-----------+--+
| tab_name |
+-----------+--+
| student |
+-----------+--+
1 row selected (0.294 seconds)
0: jdbc:hive2://localhost:10000/> select * from student;
...
INFO : OK
+---------------+--------------+---------------+--+
| student.name | student.age | student.addr |
+---------------+--------------+---------------+--+
| zhangsan | 18 | guangzhou |
| lisi | 20 | shenzhen |
+---------------+--------------+---------------+--+
2 rows selected (0.241 seconds)
0: jdbc:hive2://localhost:10000/> 
6.3impala-shell查询student表
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ klist
Ticket cache: FILE:/tmp/krb5cc_500
Default principal: [email protected]
Valid starting Expires Service principal
09/01/17 12:58:59 09/02/17 12:58:59 krbtgt/[email protected]
renew until 09/08/17 12:58:59
[ec2-user@ip-172-31-8-141 cdh-shell-master]$ impala-shell
...
[Not connected] > connect ip-172-31-10-156.ap-southeast-1.compute.internal:21000;
Connected to ip-172-31-10-156.ap-southeast-1.compute.internal:21000
Server version: impalad version 2.8.0-cdh5.11.1 RELEASE (build 3382c1c488dff12d5ca8d049d2b59babee605b4e)
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > show tables;
Query: show tables
+---------+
| name |
+---------+
| student |
+---------+
Fetched 1 row(s) in 0.02s
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > select * from student;
...
+----------+-----+-----------+
| name | age | addr |
+----------+-----+-----------+
| zhangsan | 18 | guangzhou |
| lisi | 20 | shenzhen |
+----------+-----+-----------+
Fetched 2 row(s) in 0.13s
[ip-172-31-10-156.ap-southeast-1.compute.internal:21000] > 
6.4测试总结
通过hive用户创建的外部表，给fayson用户赋予student表读权限后，可正常访问hdfs的(/extwarehouse/student)数据目录，在beeline和impala-shell命令行下，fayson用户均可查询student表数据。
7.Sentry管理Hive外部表权限总结
开启外部表的数据父目录ACL同步后，不需要单独的维护外部表数据目录权限。
参考文档：
https://www.cloudera.com/documentation/enterprise/latest/topics/sg\_hdfs\_sentry\_sync.html
醉酒鞭名马，少年多浮夸！ 岭南浣溪沙，呕吐酒肆下！挚友不肯放，数据玩的花！
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