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https://issues.apache.org/jira/browse/HADOOP-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056726#comment-15056726
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Colin Patrick McCabe commented on HADOOP-12638:
-----------------------------------------------

Hi [~steve_l], thanks for finding this.  And thanks for fixing it, [~kaisasak]. 
 I believe that our Jenkins tests only test the configuration where the bzip2 
native library is installed and functional.  So that's why this didn't show up 
in testing.  Unfortunately, I don't think it's really practical to test every 
combination of native libraries installed or not.  It would be nice to have a 
minimum set of required native libraries to run Hadoop, but that would be a 
difficult change to make at this point.

+1 for the fix

> UnsatisfiedLinkError while checking ISA-L in checknative command.
> -----------------------------------------------------------------
>
>                 Key: HADOOP-12638
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12638
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>    Affects Versions: 2.7.1
>            Reporter: Kai Sasaki
>            Assignee: Kai Sasaki
>            Priority: Minor
>         Attachments: HADOOP-12638.01.patch
>
>
> {code}
> bash-4.1# bin/hadoop checknative
> 15/12/14 05:49:34 WARN bzip2.Bzip2Factory: Failed to load/initialize 
> native-bzip2 library system-native, will use pure-Java version
> 15/12/14 05:49:34 WARN zlib.ZlibFactory: Failed to load/initialize 
> native-zlib library
> Exception in thread "main" java.lang.UnsatisfiedLinkError: 
> org.apache.hadoop.util.NativeCodeLoader.buildSupportsIsal()Z
>       at org.apache.hadoop.util.NativeCodeLoader.buildSupportsIsal(Native 
> Method)
>       at 
> org.apache.hadoop.io.erasurecode.ErasureCodeNative.<clinit>(ErasureCodeNative.java:41)
>       at 
> org.apache.hadoop.util.NativeLibraryChecker.main(NativeLibraryChecker.java:98)
> {code}
> It seems to be caused by unhandled exception thrown by 
> {{NativeCodeLoader.isNativeCodeLoader}}. 
> Env: Ubuntu 14.04 LTS



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