[jira] [Created] (RANGER-2416) a single user created twice when creating default policy and usersync process syncs user at the same time,and got 404 http code when retrive service policies

["zhangxiong (JIRA)" <ji...@apache.org>]

zhangxiong created RANGER-2416:
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             Summary: a single user created twice when creating default policy and usersync process syncs user at the same time,and got 404 http code when retrive service policies
                 Key: RANGER-2416
                 URL: https://issues.apache.org/jira/browse/RANGER-2416
             Project: Ranger
          Issue Type: Bug
          Components: admin
    Affects Versions: 0.6.0
         Environment: in hdp ambari 2.6
            Reporter: zhangxiong


a single user created twice when creating default policy and usersync process syncs user at the same time,and got 404 http code when retrive service policies.
 the two  concurrent processes creating the same  user at the same time:

1)where create a service repository like kafka, ranger admin will create a default policy for the user kafka.if the user kafka doesn't exists,ranger admin would create the user first.
 2)ranger usersnc process syncs user kafka from ldap.
if the above two process happens nearly the same time,the user will be create twice in the ranger admin side.as a result,ranger admin db's x_user table got two record for the user kafka,as shown below:
mysql> select id,added_by_id,user_name,descr from x_user where user_name='kafka' or id=2 or id=27;
+----+-------------+----------------+-------------------------------+
| id | added_by_id | user_name    | descr |
+----+-------------+----------------+-------------------------------+
| 2   | NULL       | rangerusersync | rangerusersync                         |
| 27 | 2              | ambari-qa          | ambari-qa - add from Unix box |
| 28 | 27            | kafka                  | kafka                                         |
|29|2              |kafka                   |kafka - add from Unix box       |


in this situation,if we search policies for service kafka,we got 404 http code,.this caused by XXUserDao's error for getting singleResult.

getEntityManager()
 .createNamedQuery("XXUser.findByUserName", XXUser.class)
 .setParameter("name", name.trim())
 .getSingleResult();

the command for search policies:
curl -i -H 'Authorization:Basic YW1iX3Jhbmdlcl9hZG1pbjphbWJhcmkxMjM='  -H 'Accept:application/json'  -H 'Content-Type:application/json' http://tbds-10-0-0-16:6080/service/public/api/policy?repositoryName=tdw_kafka\&repositoryType=kafka\&isEnabled=true



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