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From "Jacob Tolar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14574) dfs getmerge operation should be able to write to stdout
Date Thu, 22 Jun 2017 20:52:00 GMT
Jacob Tolar created HADOOP-14574:

             Summary: dfs getmerge operation should be able to write to stdout
                 Key: HADOOP-14574
                 URL: https://issues.apache.org/jira/browse/HADOOP-14574
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Jacob Tolar
            Priority: Minor

the getmerge command ( https://github.com/apache/hadoop/blob/6d116ffad23b470f8e9ca131d8e89cbbbb4378d7/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/CopyCommands.java#L53-L142
) should support writing to stdout as well as to a local file.

You can do this now by providing a path of /dev/fd/0, /dev/stdout, or some named pipe, but
those can be somewhat inconvenient and nonportable. (E.g. writing to /dev/stdout tries to
write /dev/.stdout.crc when I run it). 

I suggest that when called with "-" as the destination path, getmerge writes all output directly
to stdout. 

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