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From "Jaakko Laine (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-564) Provide recoverability when a node dies and it is impossible to get the same IP.
Date Tue, 08 Dec 2009 13:49:18 GMT


Jaakko Laine commented on CASSANDRA-564:

I think we can do with existing STATE_LEFT gossip state, just use the kind of tuple mentioned
earlier as an application state. If STATE_LEFT was a result of normal leave, just do the same
thing as now. If it was a result of remove token command, the nodes affected by range changes,
get the data from other replicas to restore replica count. Decommissioning could be left as
it is, since it is a case of node gracefully leaving and handing over its data to other nodes.
Remove token is to signal to other nodes that this node is no loger in service, so please
restore replica count to what it should be.

This latter functionality could be used together with Gossiper to have the cluster automatically
maintain replica count (automatically joust a node ouf ot cluster and restore replica count
after certain period of time). Don't know if this kind of functionality would be needed, but
having such self-repair would be nice at least on paper.

> Provide recoverability when a node dies and it is impossible to get the same IP.
> --------------------------------------------------------------------------------
>                 Key: CASSANDRA-564
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Anthony Molinaro
>            Priority: Minor
>             Fix For: 0.5
> From the descriptions on the mailing list, when a node dies permanently from hardware
or other failure and you need to replace it, it must have the same IP.  For people running
in cloud environments, this is often times impossible.  So it would be very useful if there
was a way to replace a node with a new node without requiring the same IP.

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