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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12657) Skip newline on empty files with getMerge -nl
Date Fri, 18 Dec 2015 04:48:46 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akira AJISAKA updated HADOOP-12657:
-----------------------------------
    Release Note: Added -skip-empty-files option to hadoop fs -getmerge command. With the
option, delimiter (LF) is not printed for empty files even if -nl option is used.

> Skip newline on empty files with getMerge -nl
> ---------------------------------------------
>
>                 Key: HADOOP-12657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12657
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 2.6.0, 2.7.1
>            Reporter: Jan Filipiak
>            Assignee: Kanaka Kumar Avvaru
>            Priority: Minor
>         Attachments: HDFS-8836-01.patch, HDFS-8836-02.patch, HDFS-8836-03.patch, HDFS-8836-04.patch,
HDFS-8836-05.patch, HDFS-8836-06.patch, HDFS-8836-07.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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