hadoop/hadoop-yarn-project/hadoop-yarn
Vinod Kumar Vavilapalli 4ff1a8203b YARN-408. Change CapacityScheduler to not disable delay-scheduling by default. Contributed by Mayank Bansal.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1550245 13f79535-47bb-0310-9956-ffa450edef68
2013-12-11 20:14:30 +00:00
..
bin YARN-1400. yarn.cmd uses HADOOP_RESOURCEMANAGER_OPTS. Should be YARN_RESOURCEMANAGER_OPTS. Contributed by Raja Aluri. 2013-11-12 03:58:14 +00:00
conf HADOOP-10040. Revert svn propset for CRLF line endings on Windows files. Contributed by Chris Nauroth. 2013-10-14 17:01:33 +00:00
dev-support YARN-895. Changed RM state-store to not crash immediately if RM restarts while the state-store is down. Contributed by Jian He. 2013-12-03 19:28:02 +00:00
hadoop-yarn-api YARN-1448. AM-RM protocol changes to support container resizing (Wangda Tan via Sandy Ryza) 2013-12-09 17:44:29 +00:00
hadoop-yarn-applications YARN-1450. Fixed test failure in TestUnmanagedAMLauncher by removing its dependency on distributed-shell. Contributed by Binglin Chang. 2013-12-06 17:53:28 +00:00
hadoop-yarn-client YARN-1332. In TestAMRMClient, replace assertTrue with assertEquals where possible (Sebastian Wong via Sandy Ryza) 2013-12-03 23:21:30 +00:00
hadoop-yarn-common YARN-1491. Upgrade JUnit3 TestCase to JUnit 4 (Chen He via jeagles) 2013-12-11 17:50:26 +00:00
hadoop-yarn-server YARN-408. Change CapacityScheduler to not disable delay-scheduling by default. Contributed by Mayank Bansal. 2013-12-11 20:14:30 +00:00
hadoop-yarn-site MAPREDUCE-5052. Job History UI and web services confusing job start time and job submit time (Chen He via jeagles) 2013-12-10 17:17:47 +00:00
README HADOOP-9872. Improve protoc version handling and detection. (tucu) 2013-08-14 22:15:04 +00:00
pom.xml MAPREDUCE-5624 Move grizzly-test and junit dependencies to test scope 2013-11-13 20:46:54 +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