[jira] [Updated] (CASSANDRA-14559) Check for endpoint collision with hibernating nodes

["Kurt Greaves (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-14559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kurt Greaves updated CASSANDRA-14559:
-------------------------------------
    Assignee: Vincent White
      Status: Patch Available  (was: Open)

> Check for endpoint collision with hibernating nodes 
> ----------------------------------------------------
>
>                 Key: CASSANDRA-14559
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14559
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Vincent White
>            Assignee: Vincent White
>            Priority: Major
>
> I ran across an edge case when replacing a node with the same address. This issue results in the node(and its tokens) being unsafely removed from gossip.
> Steps to replicate:
> 1. Create 3 node cluster.
> 2. Stop a node
> 3. Replace the stopped node with a node using the same address using the replace_address flag
> 4. Stop the node before it finishes bootstrapping
> 5. Remove the replace_address flag and restart the node to resume bootstrapping (if the data dir is also cleared at this point the node will also generate new tokens when it starts)
> 6. Stop the node before it finishes bootstrapping again
> 7. 30 Seconds later the node will be removed from gossip because it now matches the check for a FatClient
> I think this is only an issue when replacing a node with the same address because other replacements now use STATUS_BOOTSTRAPPING_REPLACE and leave the dead node unchanged.
> I believe the simplest fix for this is to add a check that prevents a non-bootstrapped node (without the replaces_address flag) starting if there is a gossip entry for the same address in the hibernate state. 
> [3.11 PoC |https://github.com/apache/cassandra/compare/trunk...vincewhite:check_for_hibernate_on_start]
>  



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