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https://issues.apache.org/jira/browse/CASSANDRA-19988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Lightfoot updated CASSANDRA-19988:
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Summary: Direct IO support for streaming (was: use direct io when
streaming through the JVM)
> Direct IO support for streaming
> -------------------------------
>
> Key: CASSANDRA-19988
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19988
> Project: Apache Cassandra
> Issue Type: Improvement
> Reporter: Jon Haddad
> Priority: Normal
>
> In the case of the non-ZCS streaming path, we read entire SSTables. This
> causes a high rate of page cache churn and should be avoided. Using direct
> IO we will avoid the churn and we should see read latency remain stable,
> rather than jittery as a result of decreased page cache hit rate.
> This affects both our streaming slow path and when sending entire files.
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