The version is 2.0.7 Why we want to add a new node is that somebody creates an index on certain table and the cluster becomes slow, so that guy tries to restart the node. However only 3 out of 4 nodes can restart and 1 node cannot restart . So we intend to add a new node however it shows error that cannot find certain cf-id and cannot be started.
So we decided to remove this newly added node by nodetool removenode. Here is the thing... We have already started remove this newly added node. Only a few data (80kb) has been migrated to this newly added node. The process of removenode seems hanging So how to resolve this situation, can we add another node? or using remove force to this newly added node? On Fri, Dec 18, 2015 at 9:09 AM, Robert Coli <rc...@eventbrite.com> wrote: > On Thu, Dec 17, 2015 at 4:44 PM, Shuo Chen <chenatu2...@gmail.com> wrote: > >> I have a 4 node cluster with status 3 UN and 1 DN. I am trying to add >> a new node into the cluster but it is also dead. So the cluster is now 3 UN >> and 2 DN. However I didnot run nodetool cleanup on any nodes. And just >> several KBs of data is migrated to this newly added node. >> >> All the keyspaces are replicated for 3. I am trying to remove this newly >> add node using nodetool removenode. But it hangs for 24 hours with remove >> node status. >> >> RemovalStatus: Removing token (-9104065154580789913). Waiting for >> replication confirmation from [/192.168.148.29,/192.168.148.24,/ >> 192.168.148.23]. >> >> Is it safe to use removenode force to remove this newly added node? Will >> any data be lost? Thanks! >> > > In general it is not "safe" to use "removenode" to remove a node from a > cluster, because removenode by definition reduces distinct replica count. > > That's why a departing node should always use "decommission," so it > streams the data it has, including any data it might be the only node it > has, to the new nodes responsible for the range. > > Your email seems to prompt questions.... It doesn't seem like your "real" > question is about removenode at all? > > Why, for example, is your new node you are adding into the cluster "dead"? > > Are you trying to replace the original DN with your new node? If so, use > "replace_address"? > > =Rob > PS - also, what version of cassandra? > -- *陈硕* *Shuo Chen* chenatu2...@gmail.com chens...@whaty.com
