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https://issues.apache.org/jira/browse/HADOOP-9996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Chen updated HADOOP-9996:
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Attachment: HADOOP-9996.patch
Attach patch for reference.
> Improve TFile format to support any compression codecs
> ------------------------------------------------------
>
> Key: HADOOP-9996
> URL: https://issues.apache.org/jira/browse/HADOOP-9996
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io
> Affects Versions: 3.0.0
> Reporter: Jerry Chen
> Labels: Rhino
> Attachments: HADOOP-9996.patch
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> TFile is a container of key-value pairs. It supports block level compression
> by using compression codec. But one limitation of the current implementation
> is it supports only a few of fixed compression codecs. They are LZO, GZ or no
> compression. Some new compression codecs such as Snappy cannot be used
> because of this limitation.
> We propose to extend the existing TFile compression feature to support any
> compression codecs. As TFile already used the named compression codecs and
> stored the name in the file meta data (for example, “lzo” was stored when LZO
> compression is used), we cannot change this for backward compatibility. To
> make it support any compression codec, we add a special name “codec” after
> which follows the real codec class name. For example, “codec:
> org.apache.hadoop.io.compress.SnappyCodec” is used and stored in the meta
> when SnappyCodec is used as the compression codec. We can still use the
> existing fixed names such as “lzo”, “gz” or “none” for specifying the TFile
> compression codec.
>
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