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Date: Fri, 11 Aug 2006 13:20:16 -0700 (PDT)
From: "Benjamin Reed (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-435) Encapsulating startup scripts and jars
 in a single Jar file.
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     [ http://issues.apache.org/jira/browse/HADOOP-435?page=all ]

Benjamin Reed updated HADOOP-435:
---------------------------------

    Attachment: start.sh

This script starts up a datanode and tasktracker. If the config indicates that the node is the jobtracker, it also starts the jobtracker and namenode.

> Encapsulating startup scripts and jars in a single Jar file.
> ------------------------------------------------------------
>
>                 Key: HADOOP-435
>                 URL: http://issues.apache.org/jira/browse/HADOOP-435
>             Project: Hadoop
>          Issue Type: New Feature
>    Affects Versions: 0.5.0
>            Reporter: Benjamin Reed
>         Attachments: hadoopit.patch, start.sh, stop.sh
>
>
> Currently, hadoop is a set of scripts, configurations, and jar files. It makes it a pain to install on compute and datanodes. It also makes it a pain to setup clients so that they can use hadoop. Everytime things are updated the pain begins again.
> I suggest that we should be able to build a single Jar file that has a Main-Class defined with the configuration built in so that we can distribute that one file to nodes and clients on updates. One nice thing that I haven't done would be to make the jarfile downloadable from the JobTracker webpage so that clients can easily submit the jobs.
> I currently use such a setup on my small cluster. To start the job tracker I used "java -jar hadoop.jar -l /tmp/log jobtracker" to submit a job I use "java -jar hadoop.jar jar wordcount.jar". I used the client on my linux and Mac OSX machines and I'll I need installed in java and the hadoop.jar file.
> hadoop.jar helps with logfiles and configurations. The default of pulling the config files from the jar file can be overridden by specifying a config directory so that you can easily have machine specific configs and still have the same hadoop.jar on all machines.
> Here are the available commands from hadoop.jar:
> USAGE: hadoop [-l logdir] command
>   User commands:
>     dfs          run a DFS admin client
>     jar          run a JAR file
>     job          manipulate MapReduce jobs
>     fsck         run a DFS filesystem check utility
>   Runtime startup commands:
>     datanode     run a DFS datanode
>     jobtracker   run the MapReduce job Tracker node
>     namenode     run the DFS namenode (namenode -format formats the FS)
>     tasktracker  run a MapReduce task Tracker node
>   HadoopLoader commands:
>     buildJar     builds the HadoopLoader jar file
>     conf         dump hadoop configuration
> Note, I don't have the classes for hadoop streaming built into this Jar file, but if I had that would also be an option (it checks for needed classes before displaying an option). It makes it very easy for users that just write scripts to use hadoop straight from their machines.
> I'm also attaching the start.sh and stop.sh scripts that I use. These are the only scripts I use to startup the daemons. They are very simple and the start.sh script uses the config file to figure out whether or not to start the jobtracker and the nameserver.
> The attached patch adds the HadoopIt patch, modifies the Configuration class to find the config files correctly, and modifies the build to make a fully contained hadoop.jar. To update the configuration in a hadoop.jar you simply use "zip hadoop.jar hadoop-site.xml".

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