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https://issues.apache.org/jira/browse/CRUNCH-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742076#comment-13742076
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Chao Shi commented on CRUNCH-246:
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Hi Josh, the reason I would prefer PCollection<KeyValue> is that the row-key
can be easily extracted from a KeyValue, so there is no need for this
duplication. And also, ImmutableBytesWritable sounds unnatural to crunch.
One thing I can think of using TableSource is that HBase's HFileOutputFormat
does the same. It does a total-order sort on row-keys. For crunch, I don't
think it is necessary (see CRUNCH-212), as crunch's pipeline is much more
flexible.
> HFileSource
> -----------
>
> Key: CRUNCH-246
> URL: https://issues.apache.org/jira/browse/CRUNCH-246
> Project: Crunch
> Issue Type: Improvement
> Components: IO
> Reporter: Chao Shi
> Assignee: Chao Shi
> Attachments: crunch-246.patch, HFileInputFormat.java
>
>
> I found this useful when directly perform MR on HFiles. I used it yesterday
> when copying a bunch of HFiles to another cluster (where the region layout is
> different).
> There is no HFileInputFormat provided by HBase, but I found the following
> from google:
> https://gist.github.com/leifwickland/1120311
> http://blog.csdn.net/kirayuan/article/details/7794402 (Java version of the
> above. The webpage is in chinese, but you can see the code)
> I'm not sure if we copy their code directly (copyright issue?). Anyone knows?
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