Hi Kresten,
after the first node has been removed, you have a cluster and an extra
machine, haven't you ;-).
Lets take you example of 5 nodes.
So instead of having to do 5 node leaves and 5 joins, you can do 1 node
leave, 4 replaces and 1 join.
Cheers,
Nico
Am 28.09.2012 13:26, schrieb Kresten Krab Thorup:
If your cluster is large enough to guarantee your N value (e.g. N=3 requires 5
nodes) then you can just remove one node at a time from the cluster (riak admin
leave), re-install the node with the new backend options, and re-join the
cluster. In between these updates you then need to wait for all transfers to
finish.
Alternatively, if you have an extra machine to spare, you can use "riak-admin
cluster replace" to transfer data from an existing node to a new node. When that
command completes (some time after commit) all data is transferred and the original node
has left the cluster. This options would be much faster because you avoid the extra
transfers and partition reshuffling, but needs an extra machine.
Kresten
Trifork
On Sep 28, 2012, at 12:59 PM, Venki Yedidha
<[email protected]<mailto:[email protected]>> wrote:
Hi All,
How to migrate from bitcask to eleveldb with out losing data from bitcask?
Thanks,
Venkatesh
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