+1 2017赵科 <464473...@qq.com.invalid> 于2023年2月21日周二 14:37写道：
> Dear predecessors > > > Thank you very much for your reply at first, the reason that add the > logical cold data judgment is we can use this to distinguish logic hot data > and logic cold data. > The logic hot data that is commonly Newly produced and a lot of normal > consumers will read it, Although this part of data are used to stay in the > pagecache(physical hot data). > So we decide that when consumers read this part of data, can not be in > cold data read control, let them read quickly. The same can be obtained，the > logic cold data that is commonly old produced and a little of unnormal > consumers will read it and this part of data are not in the pagecache. if > some unnormal consumers read logic cold data when they are not controlled, > the system disk IO stress will be high, it will influence the whole > broker's normaly reading and writing. > > > Your response would be highly appreciated. > > > Thanks, > drizzle.zk > > > 2017赵科 > 464473...@qq.com > > > > > > > > > ------------------ 原始邮件 ------------------ > 发件人: > "dev" > < > dongyuanp...@gmail.com>; > 发送时间: 2023年2月17日(星期五) 下午3:56 > 收件人: "dev"<dev@rocketmq.apache.org>; > > 主题: Re: [DISCUSS][RIP-62] Cold read control > > > > That's a good idea. But I don't understand why add the logical cold > data judgment? Physical cold data reading will have a practical > impact, but logical cold data may only be physical cold data, not > necessarily cold data, and its reading does not necessarily cause > system stress. One point that can be thought of is to speed up cold > data judgment? > > SSpirits <ad...@lv5.moe> 于2023年2月14日周二 11:54写道： > > > > Hi drizzle.zk, > > > > Currently, we have a precise way to find out cold data, please see > https://github.com/apache/rocketmq/issues/5837. And I agree with you that > we should stop prefetch CommitLog if it is not the latest file. Maybe we > can use madvise system call and MADV_FREE or MADV_DONTNEED flag. > > > > Your response would be highly appreciated. > > SSpirits > > Email：ad...@lv5.moe<mailto:ad...@lv5.moe> > > 在 2023年2月10日 +0800 18:00，2017赵科 <464473...@qq.com.INVALID>，写道： > > Hello RocketMQ Community: > > > > > > We have plans to add Cold read control features can control the > reading speed of cold data so as to ensure the stability of the system. > > We also have written the proposal, and you can see it by the link > below: > > > https://docs.google.com/document/d/1P8JPX5b9CwYMlaFi_UBxqwxFoIiOXWuAEjV4yWdfFUw/edit?usp=sharing > > > <https://docs.google.com/document/d/1P8JPX5b9CwYMlaFi_UBxqwxFoIiOXWuAEjV4yWdfFUw/edit?usp=sharing>> > ; > > > > Please welcome to reply to this email or comment on the proposal if > you have any questions or suggestions. > > > > > > > > Thanks, > > drizzle.zk > > > > > > > > > > > > > > > > 2017赵科 > > 464473...@qq.com > > > > > > > > &nbsp; -- ============================================= fuyou001 Best Regards
