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Date: Fri, 24 Jun 2011 19:25:47 +0000 (UTC)
From: "Brandon Williams (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-2818) A 0.8.1 version node can't join
 the ring made up of 0.8.0 nodes.
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     [ https://issues.apache.org/jira/browse/CASSANDRA-2818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams updated CASSANDRA-2818:
----------------------------------------

    Attachment: 2818.txt

In 0.7, we did actually add the node to the endpoint state map by calling addSavedEndpoint.  I removed this in CASSANDRA-2092, probably because it makes the log message somewhat incorrect ("XXX has restarted, now UP again") but if it was good enough for 0.7, I think it's good enough for 0.8. Note that even without the disconnect 0.7->0.8 works, but the disconnect is an optimization.  Protection from DC/RACK NPEs is guaranteed by addSavedEndpoint initially marking the node as down, so there's no reason to query the state information (other things that utilize getNaturalEndpoints may NPE like nodetool ring, but it's a short window to exploit and non-critical.)  Patch to restore the previous behavior to 0.8.

> A 0.8.1 version node can't join the ring made up of 0.8.0 nodes.
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-2818
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2818
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.1
>            Reporter: Michael Allen
>            Assignee: Brandon Williams
>             Fix For: 0.7.7, 0.8.2
>
>         Attachments: 2818-disconnect.txt, 2818.txt
>
>
> When a 0.8.1 node tries to join a 0.8.0 ring, we see an endless supply of these in system.log:
> INFO [Thread-4] 2011-06-23 21:14:04,149 IncomingTcpConnection.java (line 103) Received connection from newer protocol version. Ignorning message.
> and the node never joins the ring.

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