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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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