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https://issues.apache.org/jira/browse/CASSANDRA-8614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337943#comment-14337943
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Ariel Weisberg commented on CASSANDRA-8614:
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How are you building? Are you using build.xml or an IDE? build.xml includes a
dummy implementation of java.util.zip.CRC32 that has the missing method so it
compiles. Until CASSANDRA-8836 is done if you are using an IDE you will need to
have the compiler add -Xbootclasspath/p:${build.src.jdkoverride} where
build.src.jdkoverride is the path to src/jdkoverride.
> Select optimal CRC32 implementation at runtime
> ----------------------------------------------
>
> Key: CASSANDRA-8614
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8614
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Ariel Weisberg
> Assignee: Ariel Weisberg
> Labels: performance
> Attachments: 8614.patch, CRC32.class, Sample.java
>
>
> JDK 8 has support for an intrinsic for CRC32 that runs at 12-13 gigabytes/sec
> per core in my quick and dirty test. PureJavaCRC32 is < 800 megabytes/sec if
> I recall and it has a lookup table that evicts random cache lines every time
> it runs.
> In order to capture the benefit of that when it is available we can select a
> CRC32 implementation at startup in a static block.
> If JDK 8 is not what is running we can fall back to the existing
> PureJavaCRC32 implementation.
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