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https://issues.apache.org/jira/browse/LUCENE-8982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17266934#comment-17266934
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ASF subversion and git services commented on LUCENE-8982:
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Commit a7747b63b4ac649837469ee189b8aef10e4ce867 in lucene-solr's branch
refs/heads/master from zacharymorn
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=a7747b6 ]
LUCENE-8982: Make NativeUnixDirectory pure java with FileChannel direct IO
flag, and rename to DirectIODirectory (#2052)
LUCENE-8982: Make NativeUnixDirectory pure java with FileChannel direct IO
flag, and rename to DirectIODirectory
> 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
> Assignee: Dawid Weiss
> Priority: Major
> Time Spent: 31h 50m
> 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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