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https://issues.apache.org/jira/browse/HADOOP-8642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802197#comment-13802197
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jay vyas commented on HADOOP-8642:
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this is a very important feature. Just spent a few hours trying to figure out
why NativeIO was still being invoked by RawLocalFileSystem even though i had
turned io.native.lib.available off.
> io.native.lib.available only controls zlib
> ------------------------------------------
>
> Key: HADOOP-8642
> URL: https://issues.apache.org/jira/browse/HADOOP-8642
> Project: Hadoop Common
> Issue Type: Bug
> Components: native
> Affects Versions: 2.0.0-alpha
> Reporter: Eli Collins
>
> Per core-default.xml {{io.native.lib.available}} indicates "Should native
> hadoop libraries, if present, be used" however it looks like it only affects
> zlib. Since we always load the native library this means we may use native
> libraries even if io.native.lib.available is set to false.
> Let's make the flag to work as advertised - rather than always load the
> native hadoop library we only attempt to load the library (and report that
> native is available) if this flag is set. Since io.native.lib.available
> defaults to true the default behavior should remain unchanged (except that
> now we wont actually try to load the library if this flag is disabled).
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