Allen Wittenauer aa1052c34b YARN-2460. Remove obsolete entries from yarn-default.xml (Ray Chiang via aw) 10 years ago
..
bin 7971c97ec1 HADOOP-11022. User replaced functions get lost 2-3 levels deep (e.g., sbin) (aw) 10 years ago
conf 0c8aec43f0 YARN-2438. yarn-env.sh cleanup (aw) 10 years ago
dev-support da4ba50269 HADOOP-10893. isolated classloader on the client side. Contributed by Sangjin Lee 10 years ago
hadoop-yarn-api 485c96e3cb YARN-2001. Added a time threshold for RM to wait before starting container allocations after restart/failover. Contributed by Jian He. 10 years ago
hadoop-yarn-applications a3d9934f91 YARN-1779. Fixed AMRMClient to handle AMRMTokens correctly across ResourceManager work-preserving-restart or failover. Contributed by Jian He. 10 years ago
hadoop-yarn-client 6fe5c6b746 YARN-2568. Fixed the potential test failures due to race conditions when RM work-preserving recovery is enabled. Contributed by Jian He. 10 years ago
hadoop-yarn-common aa1052c34b YARN-2460. Remove obsolete entries from yarn-default.xml (Ray Chiang via aw) 10 years ago
hadoop-yarn-server 444acf8ea7 YARN-2565. Fixed RM to not use FileSystemApplicationHistoryStore unless explicitly set. Contributed by Zhijie Shen 10 years ago
hadoop-yarn-site 5633da2a01 YARN-2541. Fixed ResourceManagerRest.apt.vm table syntax error. Contributed by Jian He 10 years ago
README 8451ab5c01 HADOOP-9872. Improve protoc version handling and detection. (tucu) 11 years ago
pom.xml 4c197b5d56 HADOOP-10167. Mark hadoop-common source as UTF-8 in Maven pom files / refactoring. Contributed by Mikhail Antonov. 11 years ago

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