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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (PIG-2746) Pig doesn't detect all forms of compression extensions properly
Date Fri, 06 Jul 2012 06:31:35 GMT

     [ https://issues.apache.org/jira/browse/PIG-2746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai reopened PIG-2746:
-----------------------------


The patch break TestBZip.testBz2. See PIG-2391. Revert the patch temporarily until we have
a new patch.
                
> Pig doesn't detect all forms of compression extensions properly
> ---------------------------------------------------------------
>
>                 Key: PIG-2746
>                 URL: https://issues.apache.org/jira/browse/PIG-2746
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.1
>            Reporter: Harsh J
>            Assignee: Harsh J
>             Fix For: 0.11
>
>         Attachments: PIG-2746.patch, PIG-2746.patch, PIG-2746.patch
>
>
> The PigStorage has the following snippet.
> {code}
> private void setCompression(Path path, Job job) {
>      	String location=path.getName();
>         if (location.endsWith(".bz2") || location.endsWith(".bz")) {
>             FileOutputFormat.setCompressOutput(job, true);
>             FileOutputFormat.setOutputCompressorClass(job,  BZip2Codec.class);
>         }  else if (location.endsWith(".gz")) {
>             FileOutputFormat.setCompressOutput(job, true);
>             FileOutputFormat.setOutputCompressorClass(job, GzipCodec.class);
>         } else {
>             FileOutputFormat.setCompressOutput( job, false);
>         }
>     }
> {code}
> This limits it to only work with STORE filenames provided as 'output.gz' or 'output.bz2'
and for the rest (like LZO) one has to specify codecs and manually enable compression.
> Ideally Pig can rely on Hadoop's extension-to-codec detector instead of having this ladder.

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