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https://issues.apache.org/jira/browse/CASSANDRA-21134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18063039#comment-18063039
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Sam Lightfoot edited comment on CASSANDRA-21134 at 3/4/26 9:59 PM:
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Added both-DIO results. Key is that block device contention offsets gains from
reduction in memory stalls for unthrottled compaction (at least). Next set of
results to obtain are for throttled compaction, which are more production
realistic.
[~dnk]
was (Author: JIRAUSER302824):
Added both-DIO results. Key is that block device contention offsets gains from
reduction in memory stalls. Next set of results to obtain are for throttled
compaction, which are more production realistic.
[~dnk]
> Direct IO support for compaction writes
> ---------------------------------------
>
> Key: CASSANDRA-21134
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21134
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Compaction
> Reporter: Sam Lightfoot
> Assignee: Sam Lightfoot
> Priority: Normal
> Fix For: 5.x
>
> Attachments: image-2026-02-11-17-22-58-361.png,
> image-2026-02-11-17-25-58-329.png
>
>
> Follow-up from the implementation for compaction reads (CASSANDRA-19987)
> Notable points
> * Update the start-up check that impacts DIO writes
> ({_}checkKernelBug1057843{_})
> * RocksDB uses 1 MB flush buffer. This should be configurable and
> performance tested (256KB vs 1MB)
> * Introduce compaction_write_disk_access_mode /
> backgroud_write_disk_access_mode
> * Support for the compressed path would be most beneficial
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