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https://issues.apache.org/jira/browse/CASSANDRA-18756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17761375#comment-17761375
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Branimir Lambov commented on CASSANDRA-18756:
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There's a risk that making it work as intended will unexpectedly change
behaviour for people that are already using the flag, and I would rather not do
that. Especially if we change it in patch releases for all supported versions.
If we are to enable that functionality, IMHO it should be under a different
flag (and then only for a subset of versions).
> TimeWindowCompactionStrategy with unsafe_aggressive_sstable_expiration keeps
> overlaping SSTable references
> ----------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18756
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18756
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Compaction
> Reporter: Branimir Lambov
> Assignee: Ethan Brown
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When {{unsafe_aggressive_sstable_expiration}} is turned on, TWCS should not
> create or maintain an iterator of overlapping sstables. However, because
> {{TimeWindowCompactionController}} inherits from {{CompactionController}} and
> only sets {{ignoreOverlaps}} after the base class has constructed the overlap
> iterator, it ends up making an overlap iterator and then never updating it.
> The end result is that such a compaction keeps references to lots of and
> likely _all_ other SSTables on the node and thus delays the deletion of
> obsolete ones by hours or even days.
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