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Posted to issues@lucene.apache.org by "Uwe Schindler (Jira)" <ji...@apache.org> on 2021/01/17 22:54:00 UTC
[jira] [Commented] (LUCENE-8982) Make NativeUnixDirectory pure java
now that direct IO is possible
[ https://issues.apache.org/jira/browse/LUCENE-8982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17266933#comment-17266933 ]
Uwe Schindler commented on LUCENE-8982:
---------------------------------------
I am now merging the PR. Thanks Zach!
> 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 40m
> 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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