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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10998) Bash tab completion support for newer versions of hadoop
Date Fri, 22 Aug 2014 18:24:11 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HADOOP-10998:
--------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.6.0
                   3.0.0
           Status: Resolved  (was: Patch Available)

+1, I'll commit this to branch-2 and trunk. Thanks!

For future generations:

The bash tab completion code still has a lot of problems.  Ideally, we'd fix them all with
one patch that would be a rewrite of the current code.  (In fact, I wouldn't recommend people
actually use this feature at all.) But at least this patch moves the code forward in a positive
way.  There is still a lot of work to be done.

> Bash tab completion support for newer versions of hadoop
> --------------------------------------------------------
>
>                 Key: HADOOP-10998
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10998
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>         Environment: Hadoop 2.0.0-cdh4.2.1
>            Reporter: Jim Hester
>            Priority: Trivial
>             Fix For: 3.0.0, 2.6.0
>
>         Attachments: HADOOP-10998.patch
>
>
> The included version of bash completion has not been updated in almost two years and
does not work correctly with more recent versions of Hadoop.
> The command substitutions in the script were using backticks, which were interpolating
variables before they were executed and breaking the script.  In particular the awk commands
were breaking due to this interpolation.
> The attached patch changes the backticks to {{$(command)}} style for command substitution
and updates the script to work properly with newer versions of hadoop.
> I tested the script using {{zsh 5.0.5}}, {{zsh 4.3.10]}, {{bash-4.1.2}} and {{bash-3.2}}.
 Hadoop versions tested were cloudera version {{2.0.0-cdh4.2.1}} and briefly Apache {{2.5.0}}.



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