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From Jinhua Luo <luajit...@gmail.com>
Subject Re: Does node add/remove requires all cluster nodes be present?
Date Tue, 01 May 2018 06:24:05 GMT
Could you explain more?

When we add a new node, it should migrate data from other nodes, right?
What happens if other nodes are absent? For example, the cluster
consists of 3 nodes, but 2 nodes down, now we add the fourth new node,
what happens then?

2018-05-01 12:01 GMT+08:00 Jeff Jirsa <jjirsa@gmail.com>:
> nodetool decommission streams data from the losing replica, so only that instance has
to be online (and decom should be preferred to removenode)
>
> If that instance is offline, you can use removenode, but you risk violating consistency
guarantees
>
> Adding nodes is similar - bootstrap streams from the losing range
>
> --
> Jeff Jirsa
>
>
>> On Apr 30, 2018, at 8:57 PM, Jinhua Luo <luajit.io@gmail.com> wrote:
>>
>> Hi All,
>>
>> When a new node added, due to the even distribution of the new tokens,
>> the current nodes of the ring should migrate data to this new node.
>>
>> So, does it requires all nodes be present? If not, then if some nodes
>> are down, then it will miss the data migration of those parts, how and
>> when to fix it? When those nodes come back?
>>
>> Similarly, the node removal would migrate its data to other nodes, so
>> it seems that all other nodes must be present, otherwise it would lost
>> data?
>>
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