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https://issues.apache.org/jira/browse/CASSANDRA-14912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Tunnicliffe updated CASSANDRA-14912:
----------------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Ready to Commit)

Thanks, committed to 3.0 in {{0a7fbee43f25b6ad3172825cd29bae455223ab33}} and 
merged to 3.11 and trunk (with {{-s ours}})

> LegacyLayout errors on collection tombstones from dropped columns
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-14912
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14912
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Major
>             Fix For: 3.0.x, 3.11.x
>
>
> When reading legacy sstables in 3.0, the dropped column records in table 
> metadata are not checked when a collection tombstone is encountered. This 
> means that if a collection column was dropped and a new column with the same 
> name but a non-collection type subsequently added prior to upgrading to 3.0, 
> reading any sstables containing the collection data will error. This includes 
> reads done by upgradesstables, which makes recovery from this situation 
> without losing data impossible. Scrub will clean the affected tables, but any 
> valid data will also be discarded.



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