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https://issues.apache.org/jira/browse/CASSANDRA-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843654#action_12843654
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Jonathan Ellis commented on CASSANDRA-847:
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Ack, piling more patches on top of the existing ones makes life hard for 
reviewers.  This means we have to understand (a) the original code, (b) the 
original patchset, and (c) the final result.  This is particularly onerous when 
there are big changes from (b) to (c).

I guess I will try to review by squashing everything down at once but that 
defeats the purpose of having small patches. :(

> Make the reading half of compactions memory-efficient
> -----------------------------------------------------
>
>                 Key: CASSANDRA-847
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-847
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Stu Hood
>            Priority: Critical
>             Fix For: 0.7
>
>         Attachments: 
> 0001-Add-structures-that-were-important-to-the-SSTableSca.patch, 
> 0002-Implement-most-of-the-new-SSTableScanner-interface.patch, 
> 0003-Rename-RowIndexedReader-specific-test.patch, 
> 0004-Improve-Scanner-tests-and-separate-SuperCF-handling-.patch, 
> 0005-Add-Scanner-interface-and-a-Filtered-implementation-.patch, 
> 0006-Add-support-for-compaction-of-super-CFs-and-some-tes.patch, 
> 0007-Remove-ColumnKey-bloom-filter-maintenance.patch, 
> 0008-Make-Scanner-extend-Iterator-again.patch, 
> 0009-Make-CompactionIterator-a-ReducingIterator-subclass-.patch, 
> 0010-Alternative-to-ReducingIterator-that-can-return-mult.patch
>
>
> This issue is the next on the road to finally fixing CASSANDRA-16. To make 
> compactions memory efficient, we have to be able to perform the compaction 
> process on the smallest possible chunks that might intersect and contend 
> one-another, meaning that we need a better abstraction for reading from 
> SSTables.

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