Recovering datas when a node was joining again the cluster (with all node datas lost)

Justin Sheehy justin at basho.com
Tue May 18 10:07:56 EDT 2010


Hello, Germain.

You've already come across read-repair.  Between that and
hinted-handoff a great deal of passive anti-entropy is performed in a
Riak cluster.  As long as one doesn't use requests with R=N these
mechanisms are generally sufficient.

We do have plans for a more "active" anti-entropy as well, so that if
you know a given node has lost all of its data you can trigger a much
more efficient and immediate complete repair from the replicas in
other nodes.  (without needing external backups)  At this point, that
is only a plan and not a developed feature, so if you don't perform
backups then a trawling read-repair is your best bet in the case of a
complete loss of a node.

-Justin



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