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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2225) Enable compression in HBase Export
Date Sat, 13 Feb 2010 18:46:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833434#action_12833434
] 

Lars George commented on HBASE-2225:
------------------------------------

+1

I have done the same in the past and can confirm the implicit support by the InputFormat.
I added it like this

{code}
    // set output stream compression
    if (params.get(CONF_COMPRESS) != null) {
      job.set("mapred.output.compress", "true");
      job.set("mapred.output.compression.codec", "org.apache.hadoop.io.compress.GzipCodec");
    }
{code}

where CONF_COMPRESS is a simple command line switch. This is mapred code so Ted's code is
more current and can be used as is.

Ted, you want to make a patch? If not I can add it as well. Let me know.

> Enable compression in HBase Export
> ----------------------------------
>
>                 Key: HBASE-2225
>                 URL: https://issues.apache.org/jira/browse/HBASE-2225
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.20.1
>         Environment: OS agnostic
>            Reporter: Ted Yu
>            Priority: Minor
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> org.apache.hadoop.hbase.mapreduce.Export should set compression codec
> In createSubmittableJob(), the following should be added:
>     FileOutputFormat.setCompressOutput(job, true);
>     FileOutputFormat.setOutputCompressorClass(job, org.apache.hadoop.io.compress.GzipCodec.class);
> From my experiment, 10% to 50% reduction in Export output has been observed.
> SequenceFileInputFormat used by the Import tool is able to detect GzipCodec - there is
no change for Import class.

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