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https://issues.apache.org/jira/browse/HBASE-2225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833576#action_12833576
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Ted Yu commented on HBASE-2225:
-------------------------------
Here is the code I use:
// determine if GzipCodec should be used
HBaseAdmin admin = new HBaseAdmin((HBaseConfiguration)conf);
HTableDescriptor tableDesc =
admin.getTableDescriptor(tableName.getBytes());
Collection<HColumnDescriptor> families = tableDesc.getFamilies();
boolean compressed = true;
for (HColumnDescriptor col : families)
{
Compression.Algorithm algo = col.getCompressionType();
if (algo == Compression.Algorithm.NONE)
{
compressed = false;
}
}
if (!compressed)
{
FileOutputFormat.setCompressOutput(job, true);
FileOutputFormat.setOutputCompressorClass(job,
org.apache.hadoop.io.compress.GzipCodec.class);
}
> 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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