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https://issues.apache.org/jira/browse/CASSANDRA-11179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15193541#comment-15193541
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Marcus Eriksson commented on CASSANDRA-11179:
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updated to use --jobs X or -j X and make it default to 2 threads
> Parallel cleanup can lead to disk space exhaustion
> --------------------------------------------------
>
> Key: CASSANDRA-11179
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11179
> Project: Cassandra
> Issue Type: Improvement
> Components: Compaction, Tools
> Reporter: Tyler Hobbs
> Assignee: Marcus Eriksson
> Fix For: 2.1.x, 2.2.x, 3.0.x, 3.x
>
>
> In CASSANDRA-5547, we made cleanup (among other things) run in parallel
> across multiple sstables. There have been reports on IRC of this leading to
> disk space exhaustion, because multiple sstables are (almost entirely)
> rewritten at the same time. This seems particularly problematic because
> cleanup is frequently run after a cluster is expanded due to low disk space.
> I'm not really familiar with how we perform free disk space checks now, but
> it sounds like we can make some improvements here. It would be good to
> reduce the concurrency of cleanup operations if there isn't enough free disk
> space to support this.
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