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https://issues.apache.org/jira/browse/CASSANDRA-847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stu Hood updated CASSANDRA-847:
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Attachment: 0006-Add-support-for-compaction-of-super-CFs-and-some-tes.patch
0005-Add-Scanner-interface-and-a-Filtered-implementation-.patch
0004-Improve-Scanner-tests-and-separate-SuperCF-handling-.patch
This patchset applies something almost identical to the SSTableScanner
interface from CASSANDRA-674 to our current file format, and uses the new
interface for compactions.
0001
Adds necessary datastructures from 674, and makes minor changes to other
support classes
0002
Implements the majority of SSTableScanner for our current file format, and adds
shims to allow various portions of the code to continue using iterators
0003
Splits tests to allow us to test both the SSTableScanner api and direct
FileDataInput access
0004
Continues to flesh out the RowIndexedScanner implementation and tests, and
separates SuperColumn handling into a subclass for clarity
0005
Adds a 'Scanner' interface which is more limited (and might apply to
memtables?), implements a FilteredScanner which filters slices in a wrapped
Scanner, for use during AntiCompaction, and adds the CompactionIterator
implementation from 674
0006
Adds support for compaction of super column families, which has one more bug to
be ironed out (but I wanted to post this set for feedback asap, since it is
likely to change anyway) and a few tests that failed to help me find the bug.
> 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
>
>
> 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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