hadoop/hadoop-yarn-project/hadoop-yarn
Jason Lowe 784d00e0e2 YARN-3802. Two RMNodes for the same NodeId are used in RM sometimes
after NM is reconnected. Contributed by zhihai xu
(cherry picked from commit 5b5bb8dcdc)

Conflicts:

	hadoop-yarn-project/CHANGES.txt
2015-10-08 15:56:44 +00:00
..
bin YARN-3681. yarn cmd says "could not find main class 'queue'" in windows. Contributed by Craig Welch and Varun Saxena 2015-05-20 14:44:31 -07:00
conf HADOOP-7984. Add hadoop --loglevel option to change log level. Contributed by Aikira AJISAKA. 2014-11-12 21:44:05 -08:00
dev-support Revert "YARN-3181. FairScheduler: Fix up outdated findbugs issues. (kasha)" 2015-03-17 12:32:14 -07:00
hadoop-yarn-api YARN-3619. ContainerMetrics unregisters during getMetrics and leads to ConcurrentModificationException. Contributed by Zhihai Xu 2015-10-02 20:19:14 +00:00
hadoop-yarn-applications YARN-2890. MiniYarnCluster should turn on timeline service if configured to do so. Contributed by Mit Desai. 2015-09-10 10:55:23 -07:00
hadoop-yarn-client YARN-3975. WebAppProxyServlet should not redirect to RM page if AHS is enabled. Contributed by Mit Desai 2015-09-23 16:41:49 +00:00
hadoop-yarn-common YARN-3619. ContainerMetrics unregisters during getMetrics and leads to ConcurrentModificationException. Contributed by Zhihai Xu 2015-10-02 20:19:14 +00:00
hadoop-yarn-registry Preparing for 2.7.2 development: mvn versions:set -DnewVersion=2.7.2 2015-06-28 16:41:12 -07:00
hadoop-yarn-server YARN-3802. Two RMNodes for the same NodeId are used in RM sometimes 2015-10-08 15:56:44 +00:00
hadoop-yarn-site YARN-3700. Made generic history service load a number of latest applications according to the parameter or the configuration. Contributed by Xuan Gong. 2015-09-10 11:56:27 -07:00
README HADOOP-9872. Improve protoc version handling and detection. (tucu) 2013-08-14 22:29:46 +00:00
pom.xml Preparing for 2.7.2 development: mvn versions:set -DnewVersion=2.7.2 2015-06-28 16:41:12 -07:00

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