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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-665) Persist token ring across cluster restarts
Date Mon, 04 Jan 2010 19:31:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796295#action_12796295
] 

Jonathan Ellis edited comment on CASSANDRA-665 at 1/4/10 7:29 PM:
------------------------------------------------------------------

The naive solution of just using the IP->token mapping we already persist trades this problem
for a new one: it would become difficult to change the IP of an existing node.  Granted, this
is a rare operation -- but so is shutting down the entire cluster.

One way to address this is using UUIDs for identity (rather than IP, directly) and mapping
UUID -> token, UUID -> IP separately.

      was (Author: jbellis):
    The naive solution of just using the IP->token mapping wil already persist trades this
problem for a new one: it would become difficult to change the IP of an existing node.  Granted,
this is a rare operate -- but so is shutting down the entire cluster.

One way to address this is using UUIDs for identity (rather than IP, directly) and mapping
UUID -> token, UUID -> IP separately.
  
> Persist token ring across cluster restarts
> ------------------------------------------
>
>                 Key: CASSANDRA-665
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-665
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.9
>
>
> This prevents users from shooting their foot by shutting down a cluster, then restarting
it with a subset of the former nodes.

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