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https://issues.apache.org/jira/browse/LUCENE-8982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227746#comment-17227746
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Zach Chen commented on LUCENE-8982:
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[~mdrob] It does seems *ant build-native-unix* is no longer available, and
running *./gradlew helpAnt* doesn't help either. I'm not super familiar with
cpp development, but to facilitate this I've done some research and after some
trial and errors, come up with a separate PR to build the cpp code (as
decoupling the two changes might help benchmarking)
[https://github.com/apache/lucene-solr/pull/2068] . Could you please take a
look and let me know if this is a good direction to take?
Please note that in the PR, I created a new native module to host
*NativefPosixUtil.cpp*, as there's compatibility issue between cpp-library and
java-library Gradle plugins. For details, please see
[https://github.com/gradle/gradle-native/issues/352#issuecomment-461724948.]
> Make NativeUnixDirectory pure java now that direct IO is possible
> -----------------------------------------------------------------
>
> Key: LUCENE-8982
> URL: https://issues.apache.org/jira/browse/LUCENE-8982
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/misc
> Reporter: Michael McCandless
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> {{NativeUnixDirectory}} is a {{Directory}} implementation that uses direct IO
> to write newly merged segments. Direct IO bypasses the kernel's buffer cache
> and write cache, making merge writes "invisible" to the kernel, though the
> reads for merging the N segments are still going through the kernel.
> But today, {{NativeUnixDirectory}} uses a small JNI wrapper to access the
> {{O_DIRECT}} flag to {{open}} ... since JDK9 we can now pass that flag in
> pure java code, so we should now fix {{NativeUnixDirectory}} to not use JNI
> anymore.
> We should also run some more realistic benchmarks seeing if this option
> really helps nodes that are doing concurrent indexing (merging) and searching.
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