DolphinScheduler项目管理页面加载缓慢？这样优化

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1. 查看海豚运行日志（未发现异常）

tail home/dolphinscheduler/api-server/logs/dolphinscheduler-api.log

1. 尝试重启海豚的api-server模块

sh home/dolphinscheduler/bin/dolphinscheduler-daemon.sh stop api-server
sh home/dolphinscheduler/bin/dolphinscheduler-daemon.sh start api-server

1. 尝试请求超时连接发现请求能出数据，但是要十多秒
   
2. 尝试查看源码，可能是慢查询
   代码位置
   
3. 使用arthas查看运行情况

curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar 
#找dolphinscheduler-api的那个就是，我的是第一个就看到了

trace org.apache.dolphinscheduler.api.service.impl.ProjectServiceImpl queryProjectListPaging -n 1

select * from t_ds_project p
                  where 1=1  and p.id  in(1,2,3,5,6,8,9,12,13,14,16,17,19,21,22,23,25,26)
                  group by p.id
                  order by p.id desc

1. 获得慢sql，进行分析

select

    p.id, p.name, p.code, p.description, p.user_id, p.flag, p.create_time, p.update_time

        ,
    u.user_name as user_name,
    (SELECT COUNT(*) FROM t_ds_process_definition AS def WHERE def.project_code = p.code) AS def_count,
    (SELECT COUNT(*) FROM t_ds_process_definition_log def, t_ds_process_instance inst WHERE def.code =
                                                                                            inst.process_definition_code and def.version = inst.process_definition_version AND def.project_code = p.code
                                                                                        AND inst.state=1 ) as inst_running_count
from t_ds_project p
         left join t_ds_user u on u.id=p.user_id
where 1=1

  and p.id  in
      (1, 2, 3, 5, 6, 8, 9, 12, 13, 14, 16, 17, 19, 21, 22, 23, 25, 26)
group by p.id,u.user_name
order by p.id desc LIMIT 100

create index qwl_diy_index
    on t_ds_process_instance (process_definition_code, process_definition_version, state);

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