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From "Kengo Seki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7947) Validate XMLs if a relevant tool is available, when using scripts
Date Wed, 14 Jan 2015 15:55:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277107#comment-14277107
] 

Kengo Seki commented on HADOOP-7947:
------------------------------------

[~aw], thank you for your comment! And sorry for the late reply.

* In addition to YARN, httpfs also gets HADOOP_CONF_DIR from the shell environments (via system
properties).
So, I think this is not a special case. Other environment variables, like HADOOP_HOME, HADOOP_JAAS_DEBUG,
HADOOP_PREFIX, are also referred from multiple classes.
I couldn’t find the global (not only for YARN, shared by multiple projects) constant of
HADOOP_CONF_DIR.

* Thank you for your advice. I’ll refer to GenericOptionsParser.

* Currently, it shows error only when XML is not well-formed. I’ll add a feature to show
where is broken.

> Validate XMLs if a relevant tool is available, when using scripts
> -----------------------------------------------------------------
>
>                 Key: HADOOP-7947
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7947
>             Project: Hadoop Common
>          Issue Type: Wish
>          Components: scripts
>    Affects Versions: 2.7.0
>            Reporter: Harsh J
>              Labels: newbie
>         Attachments: HADOOP-7947.001.patch
>
>
> Given that we are locked down to using only XML for configuration and most of the administrators
need to manage it by themselves (unless a tool that manages for you is used), it would be
good to also validate the provided config XML (*-site.xml) files with a tool like {{xmllint}}
or maybe Xerces somehow, when running a command or (at least) when starting up daemons.
> We should use this only if a relevant tool is available, and optionally be silent if
the env. requests.



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