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https://issues.apache.org/jira/browse/HADOOP-435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490966
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Benjamin Reed commented on HADOOP-435:
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1) Yes, that is silly. I was actually thinking of changing this so that we only
set system properties that are not already set. That way we don't override
things that are set with a -D one the command line.
2) Streaming is part of contrib. If you add the streaming classes to the jar
file, streaming will work. That can be done after the build has run.
3) No, RunJar creates temp files. The nice thing about Hadoop-exe is that no
temp files are created. (I agree you don't need to check for non-null.)
4) That's fine
5) This patch has been available since Aug of last year. I'm sure some more
commands will appear before this ever gets committed :)
6) The cmds file allows you to have short names and descriptions. If you know
the fully-qualified name, it's not clear to me why you would rather do "java
-jar hadoop.jar org.apache.hadoop.ClassToRun" than "java -cp hadoop.jar
org.apache.hadoop.ClassToRun". (We already support the latter :)
7) That is another issue and it is not my aim. As I mentioned in the
description I use this patch along with extremely simple startup and shutdown
scripts to manage our cluster, but I'm not proposing my scripts to be the
standard ones.
BTW, where is the style guide?
> Encapsulating startup scripts and jars in a single Jar file.
> ------------------------------------------------------------
>
> Key: HADOOP-435
> URL: https://issues.apache.org/jira/browse/HADOOP-435
> Project: Hadoop
> Issue Type: New Feature
> Affects Versions: 0.12.1
> Reporter: Benjamin Reed
> Fix For: 0.13.0
>
> Attachments: hadoop-exe.patch, hadoop-exe.patch, hadoop-exe.patch,
> hadoopit.patch, hadoopit.patch, 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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