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https://issues.apache.org/jira/browse/CASSANDRA-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pavel Yaskevich updated CASSANDRA-1470:
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Attachment: CASSANDRA-1470-v8-for-0.7.patch
Thanks, Jake!
3). I wasn't working on the write support for direct mode, it requires a
separate ticket as it was agreed in the previous comments. arrayOffset() throws
UnsupportedOperationException for me on linux (Debian with 1.6.0_0 openJDK),
it's an optional operation the same as .array() is, so I have reworked your
code and everything is working now.
4). Fixed it
5). Don't want to start a holy-war here, it just fills more natural and
readable for me to use "this.", I haven't seen anywhere that it's forbidden (it
is optional though). So if you want me to remove those "this.", I will -
without any problem.
Don't think it should have a significantly better performance on the small
files comparing to ordinary BRAF but as I have tested and seen that it has
better performance of the large files, try to create file with 10000 column
family create/drop statements and run it using CLI and compare old and new, you
will see the difference :)
> use direct io for compaction
> ----------------------------
>
> Key: CASSANDRA-1470
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1470
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Pavel Yaskevich
> Fix For: 0.6.9
>
> Attachments: 1470-v2.txt, 1470.txt, CASSANDRA-1470-for-0.6.patch,
> CASSANDRA-1470-v2.patch,
> CASSANDRA-1470-v3-0.7-with-LastErrorException-support.patch,
> CASSANDRA-1470-v4-for-0.7.patch, CASSANDRA-1470-v5-for-0.7.patch,
> CASSANDRA-1470-v6-for-0.7.patch, CASSANDRA-1470-v7-for-0.7.patch,
> CASSANDRA-1470-v8-for-0.7.patch, CASSANDRA-1470.patch,
> use.DirectIORandomAccessFile.for.commitlog.against.1022235.patch
>
>
> When compaction scans through a group of sstables, it forces the data in the
> os buffer cache being used for hot reads, which can have a dramatic negative
> effect on performance.
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