Michael McCandless created LUCENE-8982:
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Summary: 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
{{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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