[CASSANDRA-14466] Enable Direct I/O

• Type: New Feature
• Status: In Progress
• Priority: Normal
• Resolution: Unresolved
• Fix Version/s: 5.x
• Component/s: Legacy/Local Write-Read Paths
• Assignee: Unassigned
• Reporter: Mulugeta Mammo
• Created: 23/May/18 21:12
• Updated: 14/Mar/24 06:45

Description

Hi,

JDK 10 introduced a new API for Direct IO that enables applications to bypass the file system cache and potentially improve performance. Details of this feature can be found at https://bugs.openjdk.java.net/browse/JDK-8164900.

This patch uses the JDK 10 API to enable Direct IO for the Cassandra read path. By default, we have disabled this feature; but it can be enabled using a  new configuration parameter, enable_direct_io_for_read_path. We have conducted a Cassandra read-only stress test and measured a throughput gain of up to 60% on flash drives.

The patch requires JDK 10 Cassandra Support - https://issues.apache.org/jira/browse/CASSANDRA-9608 

Please review the patch and let us know your feedback.

Thanks,

[^direct_io.patch]

 

Issue Links

• Dependency: CASSANDRA-9608 Support Java 11
• relates to: CASSANDRA-18464 Enable Direct I/O For CommitLog Files
• links to: GitHub Pull Request #232
• links to: Latest PR @ https://github.com/apache/cassandra/pull/309