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Robert Stupp commented on CASSANDRA-14466: ------------------------------------------ [~mulugetam], let's wait with a patch for review until CASSANDRA-9608 is actually in or nearly ready. For C* 4.0, we'd need a solution that works with both Java 8 _and_ 11 - i.e. works as now for Java 8 and can use direct-I/O w/ Java 11 (see the recent discussion on the dev-ML). I think, a multi-release-JAR is probably the easiest way forward and I have something lying around but not yet ready - but the final solution obviously depends on whether reflection or separate classes for 8 + 11 are easier to implement. > Enable Direct I/O > ------------------ > > Key: CASSANDRA-14466 > URL: https://issues.apache.org/jira/browse/CASSANDRA-14466 > Project: Cassandra > Issue Type: New Feature > Components: Local Write-Read Paths > Reporter: Mulugeta Mammo > Priority: Major > Attachments: direct_io.patch > > > 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] > -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org