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Zach Chen commented on LUCENE-8982: ----------------------------------- [~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. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org