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https://issues.apache.org/jira/browse/CASSANDRA-15452?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jon Haddad updated CASSANDRA-15452:
-----------------------------------
Description:
On read heavy workloads Cassandra performs much better when using a low read
ahead setting. In my tests I've seen an 5x improvement in throughput and more
than a 50% reduction in latency. However, I've also observed that it can have
a negative impact on compaction throughput.
We should investigate using the POSIX_FADV_WILLNEED on files we're compacting
to see if we can improve performance and reduce page faults. This should be
combined with an internal read ahead style buffer that Cassandra manages,
similar to a BufferedInputStream but with our own machinery.
was:
On read heavy workloads Cassandra performs much better when using a low read
ahead setting. In my tests I've seen an 5x improvement in throughput and more
than a 50% reduction in latency. However, I've also observed that it can have
a negative impact on compaction throughput.
We should investigate using the POSIX_FADV_WILLNEED on files we're compacting
to see if we can improve performance and reduce page faults.
> investigate using POSIX_FADV_DONTNEED on compaction
> ---------------------------------------------------
>
> Key: CASSANDRA-15452
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15452
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Local Write-Read Paths, Local/Compaction
> Reporter: Jon Haddad
> Priority: Normal
>
> On read heavy workloads Cassandra performs much better when using a low read
> ahead setting. In my tests I've seen an 5x improvement in throughput and
> more than a 50% reduction in latency. However, I've also observed that it
> can have a negative impact on compaction throughput.
> We should investigate using the POSIX_FADV_WILLNEED on files we're compacting
> to see if we can improve performance and reduce page faults. This should be
> combined with an internal read ahead style buffer that Cassandra manages,
> similar to a BufferedInputStream but with our own machinery.
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