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Vinod Kumar Vavilapalli 2826a35469 YARN-1670. Fixed a bug in log-aggregation that can cause the writer to write more log-data than the log-length that it records. Contributed by Mit Desai. 
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1580005 13f79535-47bb-0310-9956-ffa450edef68
 		2014-03-21 18:35:54 +00:00
..
bin YARN-1429. *nix: Allow a way for users to augment classpath of YARN daemons. (Jarek Jarcec Cecho via kasha) 2014-02-27 02:18:34 +00:00
conf YARN-321. Merging YARN-321 branch to trunk. 2014-01-26 04:51:10 +00:00
dev-support YARN-1512. Enhanced CapacityScheduler to be able to decouple scheduling from node-heartbeats. Contributed by Arun C Murthy. 2014-03-18 02:53:20 +00:00
hadoop-yarn-api YARN-1811. Fixed AMFilters in YARN to correctly accept requests from either web-app proxy or the RMs when HA is enabled. Contributed by Robert Kanter. 2014-03-21 04:20:46 +00:00
hadoop-yarn-applications YARN-1855. Made Application-history server to be optional in MiniYARNCluster and thus avoid the failure of TestRMFailover#testRMWebAppRedirect. Contributed by Zhijie Shen. 2014-03-21 00:18:33 +00:00
hadoop-yarn-client YARN-1839. Fixed handling of NMTokens in ResourceManager such that containers launched by AMs running on the same machine as the AM are correctly propagated. Contributed by Jian He. 2014-03-17 22:22:15 +00:00
hadoop-yarn-common YARN-1670. Fixed a bug in log-aggregation that can cause the writer to write more log-data than the log-length that it records. Contributed by Mit Desai. 2014-03-21 18:35:54 +00:00
hadoop-yarn-server YARN-1811. Fixed AMFilters in YARN to correctly accept requests from either web-app proxy or the RMs when HA is enabled. Contributed by Robert Kanter. 2014-03-21 04:20:46 +00:00
hadoop-yarn-site YARN-1570. Fixed formatting of the lines in YarnCommands.apt.vm docs source. Contributed by Akira Ajisaka. 2014-03-20 22:14:15 +00:00
README HADOOP-9872. Improve protoc version handling and detection. (tucu) 2013-08-14 22:15:04 +00:00
pom.xml HADOOP-10167. Mark hadoop-common source as UTF-8 in Maven pom files / refactoring. Contributed by Mikhail Antonov. 2014-01-23 22:29:23 +00:00

README 

YARN (YET ANOTHER RESOURCE NEGOTIATOR or YARN Application Resource Negotiator)
------------------------------------------------------------------------------

Requirements
-------------
Java: JDK 1.6
Maven: Maven 3

Setup
-----
Install protobuf 2.5.0 (Download from http://code.google.com/p/protobuf/downloads/list)
 - install the protoc executable (configure, make, make install)
 - install the maven artifact (cd java; mvn install)


Quick Maven Tips
----------------
clean workspace: mvn clean
compile and test: mvn install
skip tests: mvn install -DskipTests
skip test execution but compile: mvn install -Dmaven.test.skip.exec=true
clean and test: mvn clean install
run selected test after compile: mvn test -Dtest=TestClassName (combined: mvn clean install -Dtest=TestClassName)
create runnable binaries after install: mvn assembly:assembly -Pnative (combined: mvn clean install assembly:assembly -Pnative)

Eclipse Projects
----------------
http://maven.apache.org/guides/mini/guide-ide-eclipse.html

1. Generate .project and .classpath files in all maven modules
mvn eclipse:eclipse
CAUTION: If the project structure has changed from your previous workspace, clean up all .project and .classpath files recursively. Then run:
mvn eclipse:eclipse

2. Import the projects in eclipse.

3. Set the environment variable M2_REPO to point to your .m2/repository location.

NetBeans Projects
-----------------

NetBeans has builtin support of maven projects. Just "Open Project..."
and everything is setup automatically. Verified with NetBeans 6.9.1.


Custom Hadoop Dependencies
--------------------------

By default Hadoop dependencies are specified in the top-level pom.xml
properties section. One can override them via -Dhadoop-common.version=...
on the command line. ~/.m2/settings.xml can also be used to specify
these properties in different profiles, which is useful for IDEs.

Modules
-------
YARN consists of multiple modules. The modules are listed below as per the directory structure:

hadoop-yarn-api - Yarn's cross platform external interface

hadoop-yarn-common - Utilities which can be used by yarn clients and server

hadoop-yarn-server - Implementation of the hadoop-yarn-api
	hadoop-yarn-server-common - APIs shared between resourcemanager and nodemanager
	hadoop-yarn-server-nodemanager (TaskTracker replacement)
	hadoop-yarn-server-resourcemanager (JobTracker replacement)

Utilities for understanding the code
------------------------------------
Almost all of the yarn components as well as the mapreduce framework use
state-machines for all the data objects. To understand those central pieces of
the code, a visual representation of the state-machines helps much. You can first
convert the state-machines into graphviz(.gv) format by
running:
   mvn compile -Pvisualize
Then you can use the dot program for generating directed graphs and convert the above
.gv files to images. The graphviz package has the needed dot program and related
utilites.For e.g., to generate png files you can run:
   dot -Tpng NodeManager.gv > NodeManager.png