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From "Joel Knighton (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-10134) Always require replace_address to replace existing address
Date Fri, 22 Apr 2016 20:48:13 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-10134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joel Knighton updated CASSANDRA-10134:
--------------------------------------
    Status: Ready to Commit  (was: Patch Available)

> Always require replace_address to replace existing address
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-10134
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10134
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Distributed Metadata
>            Reporter: Tyler Hobbs
>            Assignee: Sam Tunnicliffe
>              Labels: docs-impacting
>             Fix For: 3.x
>
>
> Normally, when a node is started from a clean state with the same address as an existing
down node, it will fail to start with an error like this:
> {noformat}
> ERROR [main] 2015-08-19 15:07:51,577 CassandraDaemon.java:554 - Exception encountered
during startup
> java.lang.RuntimeException: A node with address /127.0.0.3 already exists, cancelling
join. Use cassandra.replace_address if you want to replace this node.
> 	at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:543)
~[main/:na]
> 	at org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:783)
~[main/:na]
> 	at org.apache.cassandra.service.StorageService.initServer(StorageService.java:720) ~[main/:na]
> 	at org.apache.cassandra.service.StorageService.initServer(StorageService.java:611) ~[main/:na]
> 	at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:378) [main/:na]
> 	at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:537) [main/:na]
> 	at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:626) [main/:na]
> {noformat}
> However, if {{auto_bootstrap}} is set to false or the node is in its own seed list, it
will not throw this error and will start normally.  The new node then takes over the host
ID of the old node (even if the tokens are different), and the only message you will see is
a warning in the other nodes' logs:
> {noformat}
> logger.warn("Changing {}'s host ID from {} to {}", endpoint, storedId, hostId);
> {noformat}
> This could cause an operator to accidentally wipe out the token information for a down
node without replacing it.  To fix this, we should check for an endpoint collision even if
{{auto_bootstrap}} is false or the node is a seed.



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