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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-474) support compressed text files as input and output
Date Fri, 08 Sep 2006 20:56:23 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-474?page=all ]

Owen O'Malley updated HADOOP-474:

    Attachment: text-gz-3.patch

This patch extends the previous one by:
  1. moving the set/get methods for output compression to OutputFormatBase
  2. moving the set/get methods for sequence file compression type to SequenceFile
  3. adding new methods to JobConf for set/get of the map output compression codec
  4. change the attribute names from mapred.seqfile.* to io.seqfile.*

> support compressed text files as input and output
> -------------------------------------------------
>                 Key: HADOOP-474
>                 URL: http://issues.apache.org/jira/browse/HADOOP-474
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.5.0
>            Reporter: Owen O'Malley
>         Assigned To: Owen O'Malley
>             Fix For: 0.6.0
>         Attachments: text-gz-2.patch, text-gz-3.patch, text-gz.patch
> I'd like TextInputFomat and TextOutputFormat to automatically compress and uncompress
text files when they are read and written. Furthermore, I'd like to be able to use custom
compressors as defined in HADOOP-441. Therefore, I propose:
> Adding a map of compression codecs in the server config files:
> io.compression.codecs = "<suffix>=<codec class>,..."
> so the default would be something like:
> <property>
>   <name>io.compression.codecs</name>
>   <value>.gz=org.apache.hadoop.io.GZipCodec,.Z=org.apache.hadoop.io.ZipCodec</value>
>   <description>A list of file suffixes and the codecs for them.</description>
> </property>
> note that the suffix can include multiple "." so you could support suffixes like ".tar.gz",
but they are just treated as literals against the end of the filename.
> If the TextInputFormat is dealing with such a file, it:
>   1. makes a single split
>   2. decompresses automatically
> On the output side, if mapred.output.compress is true, then TextOutputFormat would use
a new property mapred.output.compression.codec that would define the codec to use to compress
the outputs,  defaulting to gzip. 

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