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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-644) Provide way to remove nodes from gossip entirely
Date Fri, 18 Dec 2009 16:19:19 GMT
Provide way to remove nodes from gossip entirely
------------------------------------------------

                 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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