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https://issues.apache.org/jira/browse/CASSANDRA-15533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17095972#comment-17095972
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Jordan West commented on CASSANDRA-15533:
-----------------------------------------
Thanks for taking a look [~Bereng] [~blerer]. I had spoken with [~bdeggleston]
and while this patch works, we'd like to extend it to other cases where
allocating a {{MergeIterator}} is unnecessary besides SASI. That said, we can
split that out in the spirit of getting this closed for 4.0.
> Don't allocate unneeded MergeIterator in OnDiskToken#iterator
> --------------------------------------------------------------
>
> Key: CASSANDRA-15533
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15533
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/SASI
> Reporter: Jordan West
> Assignee: Jordan West
> Priority: Normal
> Fix For: 4.0, 4.0-rc
>
>
> When reviewing CASSANDRA-15392 it became apparent that the MergeIterator
> allocated by OnDiskToken#iterator is rarely necessary and so we should avoid
> allocating one when not needed and skip the MergeIterator pool when needed
> because its unlikely to be sized correctly.
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