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Enrico Berti 9b70e33c52 HUE-933 [oozie] Confirmation popup when leaving a workflow with unsaved modifications %!s(int64=13) %!d(string=hai) anos
apps 9b70e33c52 HUE-933 [oozie] Confirmation popup when leaving a workflow with unsaved modifications %!s(int64=13) %!d(string=hai) anos
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ext fe930e9ebb [core] Remove pyexcelerator %!s(int64=13) %!d(string=hai) anos
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.gitattributes ae333e405b hue (formerly Cloudera Desktop) from internal commit 4694ac0434dad85170854c5378a389585d87f679 %!s(int64=15) %!d(string=hai) anos
.gitignore e2cc325853 HUE-787 [Desktop] Config dump view uses raw values instead of type cased values in template. %!s(int64=13) %!d(string=hai) anos
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Makefile 0b2f8b09a7 [core] i18n of the desktop libs %!s(int64=13) %!d(string=hai) anos
Makefile.sdk 7ee080aec3 HUE-758 [core] Internationalization %!s(int64=13) %!d(string=hai) anos
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Makefile.vars 7ee080aec3 HUE-758 [core] Internationalization %!s(int64=13) %!d(string=hai) anos
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NOTICE.txt fe930e9ebb [core] Remove pyexcelerator %!s(int64=13) %!d(string=hai) anos
README.rst 8f1a1b15e1 [doc] 2.1.0 release notes %!s(int64=13) %!d(string=hai) anos
README.testing c7e29b51f7 HUE-662. [config] Each Hadoop hdfs/mr/yarn cluster to define its own env %!s(int64=13) %!d(string=hai) anos
README.versions 119616dc17 HUE-424 - Hue Mavenization %!s(int64=15) %!d(string=hai) anos
VERSION 82a7b6eb8c [build] Updated version to 2.1.0 %!s(int64=13) %!d(string=hai) anos

README.rst

Welcome to the repository for Hue
=================================

.. note::
This is the development-oriented readme. If you want to write notes for
end users, please put them in ``dist/README``.

Hue is both a Web UI for Hadoop and a framework to create interactive Web
applications. It features:

* FileBrowser for accessing HDFS
* Job Designer for creating MapReduce/Streaming/Java jobs
* Oozie App for submitting and scheduling workflows
* JobBrowser for viewing MapReduce jobs
* Beeswax application for executing Hive queries
* A Pig/HBase shell

On top of that, a SDK is available for creating new apps integrated with Hadoop.

More documentation is available at http://cloudera.github.com/hue/.


Getting Started
===============
To build and get the core server running::

$ git clone http://github.com/cloudera/hue.git
$ cd hue
$ make apps
$ build/env/bin/hue runserver

If using the Beeswax application, start the daemon::

$ build/env/bin/hue beeswax_server

Now Hue should be running on http://localhost:8000.

The configuration in development mode is ``desktop/conf/pseudo-distributed.ini``.


Note: to start all the servers in one command (but lose the automatic reloading after source modification)::

$ build/env/bin/supervisor

To run the tests::

$ build/env/bin/hue test all
$ build/env/bin/hue test specific filebrowser
$ build/env/bin/hue test specific jobbrowser.tests:test_get_path


Development Prerequisites
===========================
You'll need these library development packages and tools installed on
your system:

Ubuntu:
* ant
* gcc
* g++
* libkrb5-dev
* libmysqlclient-dev
* libssl-dev
* libsasl2-dev
* libsasl2-modules-gssapi-mit
* libsqlite3-dev
* libtidy-0.99-0 (for unit tests only)
* libxml2-dev
* libxslt-dev
* mvn (from ``maven2`` package or tarball)
* openldap-dev / libldap2-dev
* python-dev
* python-simplejson
* python-setuptools

CentOS:
* ant
* asciidoc
* cyrus-sasl-devel
* cyrus-sasl-gssapi
* gcc
* gcc-c++
* krb5-devel
* libtidy (for unit tests only)
* libxml2-devel
* libxslt-devel
* mvn (from ``maven2`` package or tarball)
* mysql
* mysql-devel
* openldap-devel
* python-devel
* python-simplejson
* sqlite-devel

MacOS (mac port):
* liblxml
* libxml2
* libxslt
* mysql5-devel
* simplejson (easy_install)
* sqlite3


File Layout
===========
The Hue "framework" is in ``desktop``. ``/core/`` contains the Web components and
``desktop/libs/`` the API for talking to Hadoop.
The installable apps live in ``apps/``. Please place third-party dependencies in the app's ext-py/
directory.

The typical directory structure for inside an application includes:

src/
for Python/Django code
models.py
urls.py
views.py
forms.py
settings.py

conf/
for configuration (``.ini``) files to be installed

static/
for static HTML/js resources and help doc

templates/
for data to be put through a template engine

locales/
for localizations in multiple languages

For the URLs within your application, you should make your own ``urls.py``
which will be automatically rooted at ``/yourappname/`` in the global
namespace. See ``apps/about/src/about/urls.py`` for an example.


Main Stack
==========

* Python 2.4 - 2.7
* Django 1.2 https://docs.djangoproject.com/en/1.2/
* Mako
* jQuery
* Bootstrap


Using and Installing Thrift
===========================
Right now, we check in the generated thrift code.
To generate the code, you'll need the thrift binary version 0.7.0.
Please download from http://thrift.apache.org/.

The modules using ``Thrift`` have some helper scripts like ``regenerate_thrift.sh``
for regenerating the code from the interfaces.


Profiling Hue Apps
==================
Hue has a profiling system built in, which can be used to analyze server-side
performance of applications. To enable profiling::

$ build/env/bin/hue runprofileserver

Then, access the page that you want to profile. This will create files like
/tmp/useradmin.users.000072ms.2011-02-21T13:03:39.745851.prof. The format for
the file names is /tmp/....prof.

Hue uses the hotshot profiling library for instrumentation. The documentation
for this library is located at: http://docs.python.org/library/hotshot.html.

You can use kcachegrind to view the profiled data graphically::

$ hotshot2calltree /tmp/xyz.prof > /tmp/xyz.trace
$ kcachegrind /tmp/xyz.trace

More generally, you can programmatically inspect a trace::

#!/usr/bin/python
import hotshot.stats
import sys

stats = hotshot.stats.load(sys.argv[1])
stats.sort_stats('cumulative', 'calls')
stats.print_stats(100)

This script takes in a .prof file, and orders function calls by the cumulative
time spent in that function, followed by the number of times the function was
called, and then prints out the top 100 time-wasters. For information on the
other stats available, take a look at this website:
http://docs.python.org/library/profile.html#pstats.Stats


Internationalization
====================
How to update all the messages and compile them::

$ make locales

How to update and compile the messages of one app::

$ cd apps/beeswax
$ make compile-locale

How to create a new locale for an app::

$ cd $APP_ROOT/src/$APP_NAME/locale
$ $HUE_ROOT/build/env/bin/pybabel init -D django -i en_US.pot -d . -l fr


License
=======
Apache License, Version 2.0
http://www.apache.org/licenses/LICENSE-2.0