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https://issues.apache.org/jira/browse/HADOOP-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534816
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Enis Soztutar commented on HADOOP-2046:
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I give a big +1 to a step-by-step mapred tutorial as a part of the user manual.
The tutorial may start with a mapper/reducer implementation and advance through
other features such as InputFormat, RecordReader, etc.
As for the developers guide i would like to see some UML diagrams for the parts
of the kernel, including sequence diagram for task execution, and class
diagrams.
> Documentation: Hadoop Install/Configuration Guide and Map-Reduce User Manual
> ----------------------------------------------------------------------------
>
> Key: HADOOP-2046
> URL: https://issues.apache.org/jira/browse/HADOOP-2046
> Project: Hadoop
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 0.14.2
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Priority: Critical
> Fix For: 0.15.0
>
>
> I'd like to put forward some thoughts on how to structure reasonably detailed
> documentation for hadoop.
> Essentially I think of atleast 3 different profiles to target:
> * hadoop-dev, folks who are actively involved improving/fixing hadoop.
> * hadoop-user
> ** mapred application writers and/or folks who directly use hdfs
> ** hadoop cluster administrators
> For this issue, I'd like to first target the latter category (admin and
> hdfs/mapred user) - where, arguably, is the biggest bang for the buck, right
> now.
> There is a crying need to get user-level stuff documented, judging by the
> sheer no. of emails we get on the hadoop lists...
> ----
> *1. Installing/Configuration Guides*
> This set of documents caters to folks ranging from someone just playing with
> hadoop on a single-node to operations teams who administer hadoop on several
> nodes (thousands). To ensure we cover all bases I'm thinking along the lines
> of:
> * _Download, install and configure hadoop_ on a single-node cluster:
> including a few comments on how to run examples (word-count) etc.
> * *Admin Guide*: Install and configure a real, distributed cluster.
> * *Tune Hadoop*: Separate sections on how to tune hdfs and map-reduce,
> targeting power admins/users.
> I reckon most of this would be done via forrest, with appropriate links to
> javadoc.
> ---
> *2. User Manual*
> This set is geared for people who use hdfs and/or map-reduce per-se. Stuff to
> document:
> * Write a really simple mapred application, just fitting the blocks together
> i.e. maybe a walk-through of a couple of examples like word-count, sort etc.
> * Detailed information on important map-reduce user-interfaces:
> *- JobConf
> *- JobClient
> *- Tool & ToolRunner
> *- InputFormat
> *-- InputSplit
> *-- RecordReader
> *- Mapper
> *- Reducer
> *- Reporter
> *- OutputCollector
> *- Writable
> *- WritableComparable
> *- OutputFormat
> *- DistributedCache
> * SequenceFile
> *- Compression types: NONE, RECORD, BLOCK
> * Hadoop Streaming
> * Hadoop Pipes
> I reckon most of this would land up in the javadocs, specifically
> package.html and some via forrest.
> ----
> Also, as discussed in HADOOP-1881, it would be quite useful to maintain
> documentation per-release, even on the hadoop website i.e. we could have a
> main documentation page link to documentation per-release and to the trunk.
> ----
> Thoughts?
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