Provide way to remove nodes from gossip entirely
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Key: CASSANDRA-644
URL: https://issues.apache.org/jira/browse/CASSANDRA-644
Project: Cassandra
Issue Type: Improvement
Components: Tools
Reporter: Jonathan Ellis
Priority: Minor
Fix For: 0.9
As reported in CASSANDRA-634, "Now that we're gossiping about dead nodes as
well, gossip digest continues to grow without boundary when nodes come and go.
This information will never disappear as it will be propagated to new nodes no
matter how old and obsolete it is. To counter this, we need some mechanism to
(1) either remove dead node from endpointstateinfo or (2) at some point stop to
gossip about it, or both."
This is also seen when using "fat clients" that participate in the gossip ring;
if a client leaves and does not come back it stays in the gossip forever.
(This can be confusing if the client does start up again, connecting to a
_different_ cluster, but the old one notices it is back and starts gossiping to
it again!)
I would prefer to leave management of these things explicit; 3 days is long
enough that the fat client problem in particular needs another solution, and if
it needs another solution then that can become the only solution. :)
So I would be in favor of removeToken clearing out gossip entries, and also
adding a command to remove an endpoint from the gossip ring that does not have
a token associated with it (like fat clients). A command to ask "what are all
the known gossip hosts" would also be useful, since nodeprobe ring only
includes nodes w/ tokens.
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