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https://issues.apache.org/jira/browse/CASSANDRA-15897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281371#comment-17281371
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Brandon Williams commented on CASSANDRA-15897:
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+1 on 3.0.

bq. Since 4.0 cannot even read the lb SSTables, do we need a check at all when 
we drop compact storage or we would expect that there won't be already any that 
old SSTables on a cluster with 4.0 nodes? 

After CASSANDRA-16063, shouldn't it refuse to start if there are old sstables?

As far as 4.0 blocker goes, I do feel that we need all upgrade procedures 
finalized, and compact storage  would be one of them.

> Dropping compact storage with 2.1-sstables on disk make them unreadable
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-15897
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15897
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Legacy/Local Write-Read Paths
>            Reporter: Marcus Eriksson
>            Assignee: Ekaterina Dimitrova
>            Priority: Normal
>             Fix For: 3.0.x, 3.11.x, 4.0-beta
>
>
> Test reproducing: 
> https://github.com/krummas/cassandra/commits/marcuse/dropcompactstorage



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