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https://issues.apache.org/jira/browse/CASSANDRA-17048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434223#comment-17434223
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Jacek Lewandowski commented on CASSANDRA-17048:
-----------------------------------------------

Yes, I know we do not need downgrader in that case - I just say that in case of 
4 or 5 there is a risk to forget to make a switch, regardless which value is 
the default.


> Replace sequential sstable generation identifier with ULID
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-17048
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17048
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/SSTable
>            Reporter: Jacek Lewandowski
>            Assignee: Jacek Lewandowski
>            Priority: Normal
>             Fix For: 4.1
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Replace the current sequential sstable generation identifier with ULID based.
> ULID is better because we do not need to scan the existing files to pick the 
> starting number as well as we can generate globally unique identifiers. 



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