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https://issues.apache.org/jira/browse/HDFS-8836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961682#comment-14961682
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Akira AJISAKA commented on HDFS-8836:
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Sorry for late response.
bq. One could set up many oozie coordinators that would wait for A/_SUCCESS and
then start processing it. There would be no safe time to delete the file as one
is always in danger of having one of the cooridnators not executed as they
didn't find its "dataset" file.
Reasonable for me. I'll review your patch.
> Skip newline on empty files with getMerge -nl
> ---------------------------------------------
>
> Key: HDFS-8836
> URL: https://issues.apache.org/jira/browse/HDFS-8836
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.6.0, 2.7.1
> Reporter: Jan Filipiak
> Assignee: Kanaka Kumar Avvaru
> Priority: Trivial
> Attachments: HDFS-8836-01.patch, HDFS-8836-02.patch,
> HDFS-8836-03.patch, HDFS-8836-04.patch, HDFS-8836-05.patch
>
>
> Hello everyone,
> I recently was in the need of using the new line option -nl with getMerge
> because the files I needed to merge simply didn't had one. I was merging all
> the files from one directory and unfortunately this directory also included
> empty files, which effectively led to multiple newlines append after some
> files. I needed to remove them manually afterwards.
> In this situation it is maybe good to have another argument that allows
> skipping empty files.
> Thing one could try to implement this feature:
> The call for IOUtils.copyBytes(in, out, getConf(), false); doesn't
> return the number of bytes copied which would be convenient as one could
> skip append the new line when 0 bytes where copied or one would check the
> file size before.
> I posted this Idea on the mailing list
> http://mail-archives.apache.org/mod_mbox/hadoop-user/201507.mbox/%3C55B25140.3060005%40trivago.com%3E
> but I didn't really get many responses, so I thought I my try this way.
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