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https://issues.apache.org/jira/browse/HADOOP-9162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537331#comment-13537331
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Steve Loughran commented on HADOOP-9162:
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Because the snappy.jar file may not even be on the classpath, depending on the
artifacts installed you need to
# have the snappy test in a different class from NativeCodeLoader, so it
wouldn't fail to load hadoop.lib just as snappy.jar was missing.
# split the zlib test from the snappy test
> 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
>
>
> 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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