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https://issues.apache.org/jira/browse/HADOOP-9162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537861#comment-13537861
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Steve Loughran commented on HADOOP-9162:
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bq. I don't know how to achieve that, it seams a problem to introspect
System.loadLibrary("hadoop"); to find out which file it actually load.
I don't see an easy cross platform way either -unless the libraries themselves
return a version number. We could add that to the Hadoop-specific codecs, but
not to Snappy.
Regarding tests, if you use {{ExitUtils.terminate()}} instead of
{{System.exit()}}, you can write a test which calls the {{main()}} function
with different args, -after disabling exit with
{{ExitUtils.disableSystemExit()}} -this will cause an {{ExitException}} to be
thrown instead of the process exiting. That would let you write some unit tests
that check the class behaviour.
> Add utility to check native library availability
> ------------------------------------------------
>
> Key: HADOOP-9162
> URL: https://issues.apache.org/jira/browse/HADOOP-9162
> Project: Hadoop Common
> Issue Type: Improvement
> Components: native
> Affects Versions: 3.0.0, 2.0.3-alpha
> Reporter: Binglin Chang
> Assignee: Binglin Chang
> Priority: Minor
> Attachments: HADOOP-9162.patch, HADOOP-9162.v2.patch
>
>
> Many times, after deploy hadoop or when trouble shooting, we need to check
> whether native library(along with native compression libraries) can work
> properly, and I just want to use one command to check that, like this:
> hadoop org.apache.hadoop.util.NativeCodeLoader
> and it shows:
> Native library loading test:
> hadoop: false
> zlib: false
> snappy: false
> lz4: false
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