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https://issues.apache.org/jira/browse/HADOOP-8065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15675308#comment-15675308
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Ravi Prakash commented on HADOOP-8065:
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Hi Yongjun!
Thanks for rebasing the patch and your polishing touches. I think HADOOP-13114
might be the more appropriate JIRA for these changes (which Suraj kindly filed
at my request earlier.) since this patch does not compress *during* transfer;
only after transfer and before writing to HDFS.
- {{getCompressionCodcec}} has the same typo I pointed out to Suraj. He did
post updated patches on HADOOP-13114. I apologize for neglecting to review
those patches despite Suraj's requests.
- {{getCompressionCodcec}} also uses ReflectionUtils. I don't know if it'd be
better to use [this
pattern|https://github.com/apache/hadoop/blob/b4f1971ff1dd578353036d7a123fe83c27c1e803/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/lib/CombineFileInputFormat.java#L159]
instead?
- We're still not using a CodecPool like I suggested earlier. The patch in
HADOOP-13114 actually is. Let me rebase and upload that. Could you please take
a look at that?
> distcp should have an option to compress data while copying.
> ------------------------------------------------------------
>
> Key: HADOOP-8065
> URL: https://issues.apache.org/jira/browse/HADOOP-8065
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 0.20.2
> Reporter: Suresh Antony
> Assignee: Suraj Nayak
> Priority: Minor
> Labels: distcp
> Fix For: 0.20.2
>
> Attachments: HADOOP-8065-trunk_2015-11-03.patch,
> HADOOP-8065-trunk_2015-11-04.patch, HADOOP-8065-trunk_2016-04-29-4.patch,
> HADOOP-8065.005.patch, HADOOP-8065.006.patch, patch.distcp.2012-02-10
>
>
> We would like compress the data while transferring from our source system to
> target system. One way to do this is to write a map/reduce job to compress
> that after/before being transferred. This looks inefficient.
> Since distcp already reading writing data it would be better if it can
> accomplish while doing this.
> Flip side of this is that distcp -update option can not check file size
> before copying data. It can only check for the existence of file.
> So I propose if -compress option is given then file size is not checked.
> Also when we copy file appropriate extension needs to be added to file
> depending on compression type.
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