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https://issues.apache.org/jira/browse/CASSANDRA-16782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Eriksson updated CASSANDRA-16782:
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Test and Documentation Plan: cci run
Status: Patch Available (was: Open)
This patch collects smallest sstables until the total size is 1GB or we reach
1000 sstables (both configurable), and compacts them together. Once we can't do
any compactions like that (say the 4 smallest sstables size is > 1GB) we start
doing L0 -> L1 compactions instead, this avoids creating huge sstables in L0.
With TWCS we take the same approach, but once we can't do any more compactions
like that we do regular STCS
[https://github.com/krummas/cassandra/commits/marcuse/16782]
[https://app.circleci.com/pipelines/github/krummas/cassandra?branch=marcuse%2F16782]
> Improve the way we pick sstables for STCS-in-L0 and in TWCS 'current' window
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-16782
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16782
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Compaction/LCS, Local/Compaction/TWCS
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Priority: Normal
> Fix For: 4.x
>
>
> The goal when being behind in L0 should always be to get the number of
> sstables down to a reasonable level as soon as possible. Currently it is
> common that we run compactions on the large sstables but leave thousands of
> tiny sstables behind.
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