问题

CM登录页面加载不出或者非常缓慢

现象

查看阿里云，发现对应rds负载很高，对应的SQL为

select dbaudit0_.AUDIT_ID as AUDIT1_0_, dbaudit0_.OPTIMISTIC_LOCK_VERSION as OPTIMIST2_0_, dbaudit0_.ACTING_USER_ID as ACTING3_0_, dbaudit0_.AUDIT_TYPE as AUDIT4_0_, dbaudit0_.CLUSTER_ID as CLUSTER5_0_, dbaudit0_.SERVICE_ID as SERVICE6_0_, dbaudit0_.ROLE_ID as ROLE7_0_, dbaudit0_.COMMAND_ID as COMMAND8_0_, dbaudit0_.USER_ID as USER9_0_, dbaudit0_.HOST_ID as HOST10_0_, dbaudit0_.HOST_TEMPLATE_ID as HOST11_0_, dbaudit0_.CONFIG_CONTAINER_ID as CONFIG12_0_, dbaudit0_.EXTERNAL_ACCOUNT_ID as EXTERNA13_0_, dbaudit0_.CREATED_INSTANT as CREATED14_0_, dbaudit0_.MESSAGE as MESSAGE15_0_, dbaudit0_.IP_ADDRESS as IP16_0_, dbaudit0_.ALLOWED as ALLOWED17_0_ 
from AUDITS dbaudit0_ 
where dbaudit0_.ACTING_USER_ID=13 and dbaudit0_.AUDIT_TYPE='AUTHENTICATION' and dbaudit0_.ALLOWED=1 
order by dbaudit0_.CREATED_INSTANT DESC limit 2

相关的数据就表是cm中的AUDITS表发现该表数据量比较大，上亿。

第二行audits表.png

解决方法

暂不考虑重启service cloudera-scm-server restart。

查看scm的服务器日志，没有收获
tail -f /var/log/cloudera-scm-server/cloudera-scm-server.log
进入数据库，该表是cm库下的。查看表结构，发现没有索引。该表作用是

审核（Audits）- 查询或过滤查询在集群上的操作事件，例如用户登录
https://blog.csdn.net/z644041867/article/details/83011583

所以可以考虑清理数据

备份数据（只备份该表）
mysqldump -hhost -uuser -ppassword <库名> [表1,表2...] > xxx.sql
删除数据
truncate table cm.audits;
添加联合索引
ALTER TABLE AUDITS ADD INDEX idx_audit (ACTING_USER_ID, AUDIT_TYPE, ALLOWED);

Done.