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Date: Thu, 8 Jan 2015 01:55:35 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-11464) Reinstate support for launching
 Hadoop processes on Windows using Cygwin.
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    [ https://issues.apache.org/jira/browse/HADOOP-11464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14268697#comment-14268697 ] 

Allen Wittenauer commented on HADOOP-11464:
-------------------------------------------

I'm still working on getting an environment to test this, but a few things pop out:

* I suspect that java.library.path/JAVA_LIBRARY_PATH needs to get mangled in hadoop_finalize_libpaths for Windows as well.

* shellcheck is throwing four new warnings:
{code}
In ./hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh line 667:
      eval $1='`cygpath -p -w "${!1}" 2>/dev/null`'
           ^-- SC2086: Double quote to prevent globbing and word splitting.
              ^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.


In ./hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh line 669:
      eval $1='`cygpath -w "${!1}" 2>/dev/null`'
           ^-- SC2086: Double quote to prevent globbing and word splitting.
              ^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.
{code}

(I really need to get the shell test bits written up...)

* To support the tomcat bits (kms and eventually httpfs), the hadoop_finalize_catalina_opts function is going to need some work.  Of course, we can always punt on that till later.

* We should probably change the comment in hadoop_os_tricks tricks now.

* Because yarn is (or at least was) idiotic, it adds some custom stuff to HADOOP_OPTS in bin/yarn that probably need to be looked over.  Of course, if someone says we don't need them anymore, I'd much rather they go away.

> Reinstate support for launching Hadoop processes on Windows using Cygwin.
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-11464
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11464
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: bin
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HADOOP-11464-branch-2.001.patch, HADOOP-11464-branch-2.002.patch, HADOOP-11464.001.patch, HADOOP-11464.002.patch
>
>
> The Windows compatibility work removed the dependency on Cygwin as a compatibility layer.  However, some users may still wish to run Cygwin on a personal machine for running Hadoop commands that interact with a cluster.  This issue proposes to reinstate support for launching Hadoop processes on Windows using Cygwin to call the bash scripts.


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