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https://issues.apache.org/jira/browse/HADOOP-11627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14346264#comment-14346264
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Akira AJISAKA commented on HADOOP-11627:
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bq. It's the same for bzip2.
Rethinking this, it's not the same.
* ZlibFactory tries to load native library when the class is initialized. (only 
once)
* Bzip2Factory tries to load native library when 
{{isNativeBzip2Loaded(Configuration)}} is called. (not only once)

I don't see any existing tests for non-native bzip2 (dummy) library, so we 
don't need to introduce a setter method for Bzip2Factory. For non-native gzip 
library, setting {{ZlibFactory.nativeZlibLoaded}} to false is sufficient.
Sorry for the confusion.

> Remove io.native.lib.available from trunk
> -----------------------------------------
>
>                 Key: HADOOP-11627
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11627
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Akira AJISAKA
>            Assignee: Brahma Reddy Battula
>         Attachments: HADOOP-11627-002.patch, HADOOP-11627-003.patch, 
> HADOOP-11627.patch
>
>
> According to the discussion in HADOOP-8642, we should remove 
> {{io.native.lib.available}} from trunk, and always use native libraries if 
> they exist.



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