温馨提示：要看高清无码套图，请使用手机打开并单击图片放大查看。

1.问题描述

cloudera-scm-server服务启动失败，日志报错如下：

2017-09-10 10:23:47,267 ERROR main:com.cloudera.enterprise.dbutil.DbUtil: InnoDB engine not found. Show engines reported: [MRG_MYISAM, CSV, MyISAM, MEMORY]
2017-09-10 10:23:47,268 ERROR main:com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean: InnoDb engine isn't present or enabled. SCM requires InnoDb MySQL db engine.

2.问题复现

测试环为CDH5.12.1，以下为复现步骤。

1. 将/tmp目录修改为755权限

[root@ip-172-31-6-148 /]# chmod 755 tmp/
[root@ip-172-31-6-148 /]# ll
total 116
drwxr-xr-x. 231 root root 20480 Sep 10 15:48 tmp
[root@ip-172-31-6-148 /]# 

2.重启mysql服务

[root@ip-172-31-6-148 /]# service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]
[root@ip-172-31-6-148 /]# 

3.启动cloudera-scm-server服务

[root@ip-172-31-6-148 /]# service cloudera-scm-server restart
Stopping cloudera-scm-server:                               [  OK  ]
Starting cloudera-scm-server:                               [  OK  ]
[root@ip-172-31-6-148 /]#

4.查看启动日志报错如问题描述一致

3.解决方法

将/tmp目录权限修改为777，重启mysql和cloudera-scm-server服务

1. 修改/tmp目录权限为777

[root@ip-172-31-6-148 /]# chmod 777 tmp/
[root@ip-172-31-6-148 /]# ll
total 116
drwxrwxrwx. 231 root root 20480 Sep 10 15:48 tmp
[root@ip-172-31-6-148 /]# 

2.重启msyql服务

[root@ip-172-31-6-148 /]# service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]
[root@ip-172-31-6-148 /]# 

3.重启cloudera-scm-server服务

[root@ip-172-31-6-148 /]# service cloudera-scm-server restart
Stopping cloudera-scm-server:                               [  OK  ]
Starting cloudera-scm-server:                               [  OK  ]
[root@ip-172-31-6-148 /]#

CM正常启动，问题解决。

4.备注

• 出现InnoDBengines not found

登录mysql通过show engines命令查看mysql引擎

mysql> show engines;
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| Engine     | Support | Comment                                                    | Transactions | XA   | Savepoints |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM | YES     | Collection of identical MyISAM tables                      | NO           | NO   | NO         |
| CSV        | YES     | CSV storage engine                                         | NO           | NO   | NO         |
| MyISAM     | DEFAULT | Default engine as of MySQL 3.23 with great performance     | NO           | NO   | NO         |
| InnoDB     | YES     | Supports transactions, row-level locking, and foreign keys | YES          | YES  | YES        |
| MEMORY     | YES     | Hash based, stored in memory, useful for temporary tables  | NO           | NO   | NO         |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
5 rows in set (0.00 sec)mysql> 

注意：如果没有显示InnoDB Engine可能是/tmp目录权限不足导致，也可能是源码编译的时候未编译InnoDB引擎；

• 可以通过showplugins命令查看mysql支持的插件

mysql> show plugins;
+------------+--------+----------------+---------+---------+
| Name       | Status | Type           | Library | License |
+------------+--------+----------------+---------+---------+
| binlog     | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| partition  | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| CSV        | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| MEMORY     | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| InnoDB     | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| MyISAM     | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL    | GPL     |
+------------+--------+----------------+---------+---------+
7 rows in set (0.00 sec)
mysql> 

如果没有InnoDB则可以通过INSTALL命令安装

• 使用INSTALL命令安装InnoDB

查看mysql插件安装目录

mysql> show variables like 'plugin_dir';
+---------------+-------------------------+
| Variable_name | Value                   |
+---------------+-------------------------+
| plugin_dir    | /usr/lib64/mysql/plugin |
+---------------+-------------------------+
1 row in set (0.00 sec)

查看linux目录下是否有ha_innodb*.so的文件

[root@ip-172-31-6-148 ~]# cd /usr/lib64/mysql/plugin
[root@ip-172-31-6-148 plugin]# ll
total 1416
lrwxrwxrwx 1 root root      25 Sep 10 15:47 ha_innodb_plugin.so -> ha_innodb_plugin.so.0.0.0
lrwxrwxrwx 1 root root      25 Sep 10 15:47 ha_innodb_plugin.so.0 -> ha_innodb_plugin.so.0.0.0
-rwxr-xr-x 1 root root 1259136 Jan 26  2017 ha_innodb_plugin.so.0.0.0
[root@ip-172-31-6-148 plugin]# 

执行Install命令安装InnoDB引擎

mysql> INSTALL PLUGIN InnoDB SONAME 'ha_innodb_plugin.so';
Query OK, 0 rows affected (0.23 sec)mysql>

如果没有ha_innodb_plugin.so文件则需要考虑重新编译InnoDB引擎。

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！

温馨提示：要看高清无码套图，请使用手机打开并单击图片放大查看。

推荐关注Hadoop实操，第一时间，分享更多Hadoop干货，欢迎转发和分享。

原创文章，欢迎转载，转载请注明：转载自微信公众号Hadoop实操