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https://issues.apache.org/jira/browse/CASSANDRA-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778846#action_12778846
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Jaakko Laine edited comment on CASSANDRA-559 at 11/17/09 1:18 PM:
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I suppose this is because Header in 0.4 uses EndPoint while 0.5 uses
InetAddress. EndPoint is basically String host + int port, so writing some
kludgish stuff to bridge the gap should be relatively easy.
For version 0.5.0: On the wire use 0.4 Header format (convert InetAddress to
EndPoint before serializing) and also build a mechanism to be able to
deserialize 0.5 Header either from serialized 0.4 Header or 0.5 Header.
For 0.5.1 (or whatever the number might be): Start using 0.5 Header on the wire
and remove the kludge to build 0.5 Header from serialized 0.4 Header.
This way 0.4 would be able to gossip with 0.5.0, and 0.5.1 with 0.5.0.
Don't know if it is worth the trouble especially since we would anyway lose the
port number when converting to EndPoint.
was (Author: jaakko):
I suppose this is because Header in 0.4 uses EndPoint while 0.5 uses
InetAddress. EndPoint is basically String host + int port, so writing some
kludgish stuff to build 0.5 Header from serialized 0.4 Header and vice versa
would not be very difficult. Don't know if this is worth the trouble though, as
we're anyway going to lose port number when building 0.4 Header from 0.5 Header.
> Allow 0.5 node to participate in 0.4 gossip ring
> ------------------------------------------------
>
> Key: CASSANDRA-559
> URL: https://issues.apache.org/jira/browse/CASSANDRA-559
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 0.5
>
> Attachments: 559.patch
>
>
> this would allow incremental upgrading of 0.4 cluster to 0.5 instead of
> having to shut down, upgrade, restart all.
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