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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-644) Provide way to remove nodes from gossip entirely
Date Wed, 13 Jan 2010 22:49:56 GMT


Jonathan Ellis updated CASSANDRA-644:

    Affects Version/s: 0.5
           Issue Type: Bug  (was: Improvement)

(I originally marked this as Improvement, but isn't decommission/removeToken not cleaning
out from gossip a Bug?)

> Provide way to remove nodes from gossip entirely
> ------------------------------------------------
>                 Key: CASSANDRA-644
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions: 0.5
>            Reporter: Jonathan Ellis
>            Assignee: Jaakko Laine
>            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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