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https://issues.apache.org/jira/browse/CASSANDRA-11412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208065#comment-15208065
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Marcus Eriksson commented on CASSANDRA-11412:
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[this|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java#L381]
could also be a bug(?) since the scanners don't implement hashCode or equals
(cc [~molsson])
> Many sstablescanners opened during repair
> -----------------------------------------
>
> Key: CASSANDRA-11412
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11412
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Marcus Eriksson
>
> Since CASSANDRA-5220 we open [one sstablescanner per range per
> sstable|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java#L374].
> If compaction gets behind and you are running vnodes with 256 tokens and
> RF3, this could become a problem (ie, {{768 * number of sstables}} scanners)
> We could probably refactor this similar to the way we handle scanners with
> LCS - only open the scanner once we need it
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