[jira] [Updated] (CASSANDRA-17899) Allow reducing scope for L0 to L1 compactions when space is limited

["Josh McKenzie (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-17899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh McKenzie updated CASSANDRA-17899:
--------------------------------------
    Change Category: Operability
         Complexity: Normal
      Fix Version/s: 4.x
             Status: Open  (was: Triage Needed)

> Allow reducing scope for L0 to L1 compactions when space is limited
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-17899
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17899
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Compaction/LCS
>            Reporter: Josh McKenzie
>            Assignee: Josh McKenzie
>            Priority: Normal
>             Fix For: 4.x
>
>
> When using LCS we currently only allow reducing scope when doing STCS-in-L0, reason being that removing an sstable from a compaction targeting higher level could cause overlap in the level.
> It is safe to remove sstables from L0 when doing L0->L1 compactions though, and this can allow us to continue compacting when we have a few gigantic sstables in L0.



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