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Date: Tue, 1 Jul 2008 15:06:44 -0700 (PDT)
From: "Bo Adler (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-3562) StreamXMLRecordReader does not
 support gzipped files
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     [ https://issues.apache.org/jira/browse/HADOOP-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bo Adler updated HADOOP-3562:
-----------------------------

    Attachment: 0002-support-for-gzip-d-xml-records.patch

Here is a patch which adds gzip support.

It was slightly awkward to do in a very clean way.  In particular, I had to change the access modifier of a variable from a super-class; arguably, I could have just created a duplicate variable within the StreamInputFormat class, but I expect that other subclasses will have similar issues so I opted for changing the parent class.

The other ugly change I had to make was move pos_ into StreamBaseRecordReader, but still require inheritors to update the variable.


> StreamXMLRecordReader does not support gzipped files
> ----------------------------------------------------
>
>                 Key: HADOOP-3562
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3562
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.17.0
>            Reporter: Bo Adler
>         Attachments: 0001-test-to-demonstrate-problem.patch, 0002-support-for-gzip-d-xml-records.patch
>
>
> I am using Hadoop Streaming to analyze Wikipedia data files, which are in XML format and are compressed because they are so large.  While doing some preliminary tests, I discovered that you cannot use StreamXMLRecordReader with gzipped data files -- the data is fed into the mapper script as raw data.

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