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https://issues.apache.org/jira/browse/LUCENE-8982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17232870#comment-17232870
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Dawid Weiss commented on LUCENE-8982:
-------------------------------------
Yeah... like I suspected - CI does complain about missing toolchains.
https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/28653/consoleText
{code}
* What went wrong:
Execution failed for task ':lucene:misc:native:compileDebugLinuxCpp'.
> No tool chain is available to build C++ for host operating system 'Linux'
> architecture 'x86-64':
- Tool chain 'visualCpp' (Visual Studio):
- Visual Studio is not available on this operating system.
- Tool chain 'gcc' (GNU GCC):
- Could not find C++ compiler 'g++' in system path.
- Tool chain 'clang' (Clang):
- Could not find C++ compiler 'clang++' in system path.
{code}
I think we'll switch native builds to be optionally enabled (rather than
disabled)?
> 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: 9h
> 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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