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https://issues.apache.org/jira/browse/HADOOP-8901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471978#comment-13471978
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Colin Patrick McCabe commented on HADOOP-8901:
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I tested this patch on CentOS 5.8 and verified that I could run TestDFSIO
without {{libz.so}} present (but with {{libz.so.1}} present), with
{{mapred.map.output.compress.codec}} set to
{{org.apache.hadoop.io.compress.GzipCodec}}.
> GZip and Snappy support may not work without unversioned libraries
> ------------------------------------------------------------------
>
> Key: HADOOP-8901
> URL: https://issues.apache.org/jira/browse/HADOOP-8901
> Project: Hadoop Common
> Issue Type: Bug
> Components: native
> Affects Versions: 2.0.3-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HADOOP-8901.001.patch
>
>
> Currently, we use {{dlopen}} to open {{libz.so}} and {{libsnappy.so}}, to get
> Gzip and Snappy support, respectively.
> However, this is not correct; we should be dlopening {{libsnappy.so.1}}
> instead. The versionless form of the shared library is not commonly
> installed except by development packages. Also, we may run into subtle
> compatibility problems if a new version of libsnappy comes out.
> For libz, I believe we should simply link normally against it, rather than
> loading it using {{dlopen}}. It is part of the base Linux install for every
> distribution I'm aware of, so let's not overcomplicate things.
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