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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1437) Eclipse plugin for developing and executing MapReduce programs on Hadoop
Date Wed, 01 Aug 2007 23:15:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517109
] 

Owen O'Malley commented on HADOOP-1437:
---------------------------------------

I actually did play with it and sent the feedback straight to Eugene. I guess I should post
it here, too.

I tried it out and it looks pretty good.

1. It is unfortunate that you need to unzip into the eclipse installation directory rather
than using the eclipse plugin management tools.

2. I could use it to define Mappers and Reducers.

3. When I tried to define a Launcher, it didn't find any Mappers or Reducers, even though
I'd just made them with the wizard.

4. When I defined a Launcher by hand, I didn't find a way to tell the plugin about it, so
it wouldn't let me run a map/reduce application.

5. I used "Connect to a MapReduce cluster" and the first time I didn't provide a login, and
it didn't actually connect to anything. I could not figure out how to delete it. The login
seems to be required for it to work, but not required by the form.

6. I don't understand why it wants a login/password to connect to the cluster. I never feel
comfortable putting a real password into non-system software.

7. After I made a second connection to a cluster with a username, I could browse the dfs.

8. Clicking on "Transfer files to the HDFS" didn't do anything that I could see.

9. It might be nice to have the template parameterized by the types of the map output key/value
types and the reduce output key/value types.

10. Most reduces have the form:

public void reduce(WritableComparable _key, Iterator values, OutputCollector output, Reporter
reporter) throws IOException {
  KeyType key = (KeyType) _key;
  while (values.hasNext()) {
     ValueType value = (ValueType) values.next();
     // process value
  }
}

and it might be worth making the template provide more guidance to newbies.

I think it is great that IBM is creating this plugin.


> Eclipse plugin for developing and executing MapReduce programs on Hadoop
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-1437
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1437
>             Project: Hadoop
>          Issue Type: New Feature
>         Environment: Eclipse 3.2.0+, Java 1.5.0+
>            Reporter: Eugene Hung
>         Attachments: mrt-eclipse-1.0.4.zip
>
>
> An Eclipse plugin for developing and executing MapReduce programs on remote Hadoop servers.
 Automatically provides templates for creating Map/Reduce classes, transparently bundles the
classes into JAR files and sends them to a remote server for execution.  Allows the user to
easily view status of Hadoop jobs and browse/upload/delete files from the Hadoop DFS within
the Eclipse IDE.

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