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Mirror of Apache Kylin
License: Apache License 2.0
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利用redis缓存 防止一个大查询造成雪崩
1 。虽然有了redis缓存，但如果有同样的查询，应该用 自旋锁 将其他的锁定，等这个 查询返回后，其他的从redis取。
解决： 如果某个查询很大很慢，耗费大量资源，同样的查询会 hold住，防止雪崩，把所有的kylin query server 都slow了。
- 缓存过期策略的问题。 目前先默认 过期策略为6小时。
kylin web 登陆权限 和 api 访问权限 改造的问题
按照 用户组 分配账号。
同时有超级管理员 admin。
和 给api查询使用的 超级查询管理员 admin_query
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