Hi Peng, Correct, you would want to repair in either case.
Regards, Anthony On Fri, 23 Mar 2018 at 14:09, Peng Xiao <2535...@qq.com> wrote: > Hi Anthony, > > there is a problem with replacing dead node as per the blog,if the > replacement process takes longer than max_hint_window_in_ms,we must run > repair to make the replaced node consistent again, since it missed ongoing > writes during bootstrapping.but for a great cluster,repair is a painful > process. > > Thanks, > Peng Xiao > > > > ------------------ 原始邮件 ------------------ > *发件人:* "Anthony Grasso"<anthony.gra...@gmail.com>; > *发送时间:* 2018年3月22日(星期四) 晚上7:13 > *收件人:* "user"<user@cassandra.apache.org>; > *主题:* Re: replace dead node vs remove node > > Hi Peng, > > Depending on the hardware failure you can do one of two things: > > 1. If the disks are intact and uncorrupted you could just use the disks > with the current data on them in the new node. Even if the IP address > changes for the new node that is fine. In that case all you need to do is > run repair on the new node. The repair will fix any writes the node missed > while it was down. This process is similar to the scenario in this blog > post: > http://thelastpickle.com/blog/2018/02/21/replace-node-without-bootstrapping.html > > 2. If the disks are inaccessible or corrupted, then use the method as > described in the blogpost you linked to. The operation is similar to > bootstrapping a new node. There is no need to perform any other remove or > join operation on the failed or new nodes. As per the blog post, you > definitely want to run repair on the new node as soon as it joins the > cluster. In this case here, the data on the failed node is effectively lost > and replaced with data from other nodes in the cluster. > > Hope this helps. > > Regards, > Anthony > > > On Thu, 22 Mar 2018 at 20:52, Peng Xiao <2535...@qq.com> wrote: > >> Dear All, >> >> when one node failure with hardware errors,it will be in DN status in the >> cluster.Then if we are not able to handle this error in three hours(max >> hints window),we will loss data,right?we have to run repair to keep the >> consistency. >> And as per >> https://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html,we >> can replace this dead node,is it the same as bootstrap new node?that means >> we don't need to remove node and rejoin? >> Could anyone please advise? >> >> Thanks, >> Peng Xiao >> >> >> >> >>
