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Date: Tue, 9 Oct 2012 00:32:03 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8901) GZip and Snappy support may not
 work without unversioned libraries
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    [ https://issues.apache.org/jira/browse/HADOOP-8901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471989#comment-13471989 ] 

Todd Lipcon commented on HADOOP-8901:
-------------------------------------

This seems to incorporate HADOOP-6069, which, the first time it was floated, had some objections. So rather than sneaking that change into this bug fix, we should have this just be a fix for the cmake regression, and use HADOOP-6069 if we want to make libz non-dynamic.
                
> 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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