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From "Glen Mazza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9206) "Setting up a Single Node Cluster" instructions need improvement in 0.23.5/2.0.2-alpha branches
Date Mon, 14 Jan 2013 18:56:13 GMT
Glen Mazza created HADOOP-9206:
----------------------------------

             Summary: "Setting up a Single Node Cluster" instructions need improvement in
0.23.5/2.0.2-alpha branches
                 Key: HADOOP-9206
                 URL: https://issues.apache.org/jira/browse/HADOOP-9206
             Project: Hadoop Common
          Issue Type: Bug
          Components: documentation
    Affects Versions: 0.23.5, 2.0.2-alpha
            Reporter: Glen Mazza


Hi, in contrast to the easy-to-follow 1.0.4 instructions (http://hadoop.apache.org/docs/r1.0.4/single_node_setup.html)
the 0.23.5 and 2.0.2-alpha instructions (http://hadoop.apache.org/docs/r2.0.2-alpha/hadoop-yarn/hadoop-yarn-site/SingleCluster.html)
need more clarification -- it seems to be written for people who already know and understand
hadoop.  In particular, these points need clarification:

1.) Text: "You should be able to obtain the MapReduce tarball from the release."

Question: What is the MapReduce tarball?  What is its name?  I don't see such an object within
the hadoop-0.23.5.tar.gz download.

2.) Quote: "NOTE: You will need protoc installed of version 2.4.1 or greater."

Protoc doesn't have a website you can link to (it's just mentioned offhand when you Google
it) -- is it really the case today that Hadoop has a dependency on such a minor project? 
At any rate, if you can have a link of where one goes to get/install Protoc that would be
good.

3.) Quote: "Assuming you have installed hadoop-common/hadoop-hdfs and exported $HADOOP_COMMON_HOME/$HADOOP_HDFS_HOME,
untar hadoop mapreduce tarball and set environment variable $HADOOP_MAPRED_HOME to the untarred
directory."

I'm not sure what you mean by the forward slashes: hadoop-common/hadoop-hdfs and $HADOOP_COMMON_HOME/$HADOOP_HDFS_HOME
-- do you mean & (install both) or *or* just install one of the two?  This needs clarification--please
remove the forward slash and replace it with what you're trying to say.  The audience here
is complete newbie and they've been brought to this page from here: http://hadoop.apache.org/docs/r0.23.5/
(same with r2.0.2-alpha/) (quote: "Getting Started - The Hadoop documentation includes the
information you need to get started using Hadoop. Begin with the Single Node Setup which shows
you how to set up a single-node Hadoop installation."), they've downloaded hadoop-0.23.5.tar.gz
and want to know what to do next.  Why are there potentially two applications -- hadoop-common
and hadoop-hdfs and not just one?  (The download doesn't appear to have two separate apps)
-- if there is indeed just one app and we remove the other from the above text to avoid confusion?

Again, I just downloaded hadoop-0.23.5.tar.gz -- do I need to download more?  If so, let us
know in the docs here.

Also, the fragment: "Assuming you have installed hadoop-common/hadoop-hdfs..."  No, I haven't,
that's what *this* page is supposed to explain to me how to do -- how do I install these two
(or just one of these two)?

Also, what do I set $HADOOP_COMMON_HOME and/or $HADOOP_HDFS_HOME to?

4.) Quote: "NOTE: The following instructions assume you have hdfs running."  No, I don't--how
do I do this?  Again, this page is supposed to teach me that.

5.) Quote: "To start the ResourceManager and NodeManager, you will have to update the configs.
Assuming your $HADOOP_CONF_DIR is the configuration directory..."

Could you clarify here what the "configuration directory" is, it doesn't exist in the 0.23.5
download.  I just see bin,etc,include,lib,libexec,sbin,share folders but no "conf" one.)

6.) Quote: "Assuming that the environment variables $HADOOP_COMMON_HOME, $HADOOP_HDFS_HOME,
$HADOO_MAPRED_HOME, $YARN_HOME, $JAVA_HOME and $HADOOP_CONF_DIR have been set appropriately."

We'll need to know what to set YARN_HOME to here.

Thanks!
Glen

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