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Posted to commits@cassandra.apache.org by "Marcus Eriksson (Jira)" <ji...@apache.org> on 2022/01/20 14:24:00 UTC

[jira] [Updated] (CASSANDRA-17272) LeveledCompactionStrategy disk space check improvements

     [ https://issues.apache.org/jira/browse/CASSANDRA-17272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcus Eriksson updated CASSANDRA-17272:
----------------------------------------
     Bug Category: Parent values: Degradation(12984)Level 1 values: Resource Management(12995)
       Complexity: Low Hanging Fruit
      Component/s: Local/Compaction/LCS
    Discovered By: Adhoc Test
    Fix Version/s: 3.0.26
                   3.11.12
                   4.0.2
                   4.1
         Severity: Normal
           Status: Open  (was: Triage Needed)

https://github.com/apache/cassandra/pull/1411
https://github.com/apache/cassandra/pull/1412
https://github.com/apache/cassandra/pull/1413

https://app.circleci.com/pipelines/github/krummas/cassandra?branch=marcuse%2Flcs_disk_space
https://app.circleci.com/pipelines/github/krummas/cassandra?branch=marcuse%2Flcs_disk_space-3.11
https://app.circleci.com/pipelines/github/krummas/cassandra?branch=marcuse%2Flcs_disk_space-4.0

> LeveledCompactionStrategy disk space check improvements
> -------------------------------------------------------
>
>                 Key: CASSANDRA-17272
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17272
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Compaction/LCS
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Normal
>             Fix For: 3.0.26, 3.11.12, 4.0.2, 4.1
>
>
> We currently allow reducing scope (removing sstables from the compaction) when starting STCS-in-L0 with LCS if the compaction is too large for the available disk space. We can do the same for L0 -> L1 compactions - but we can only remove L0 sstables to avoid causing overlap in L1.
> Also, in 3.0, when starting an LCS compaction we try to [get a writeable location|https://github.com/apache/cassandra/blob/b1a8a56c563b85ab9a34d3bbf9c16278dd441157/src/java/org/apache/cassandra/db/compaction/writers/CompactionAwareWriter.java#L128] where the full result of the compaction will fit - here we should only get a directory where the first sstable fits, otherwise the compaction might fail even though there is enough space in total among the data directories 



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