hadoop/hadoop-mapreduce-project/hadoop-yarn
2011-10-05 14:01:32 +00:00
..
bin MAPREDUCE-3113. Ensure bin/yarn and bin/yarn-daemon.sh identify the root of the install properly. Contributed by Xie Xianshan. 2011-09-30 23:58:58 +00:00
conf HADOOP-7560. Change src layout to be heirarchical. Contributed by Alejandro Abdelnur. 2011-08-25 00:14:24 +00:00
dev-support MAPREDUCE-2952. Fixed ResourceManager/MR-client to consume diagnostics for AM failures in a couple of corner cases. Contributed by Arun C Murthy. 2011-09-25 14:46:59 +00:00
hadoop-yarn-api MAPREDUCE-3098. Fixed RM and MR AM to report YarnApplicationState and application's FinalStatus separately. Contributed by Hitesh Shah. 2011-09-30 12:46:32 +00:00
hadoop-yarn-applications MAPREDUCE-3013. Removed YarnConfiguration.YARN_SECURITY_INFO and its usage as it doesn't affect security any more. (vinodkv) 2011-10-05 11:43:05 +00:00
hadoop-yarn-common MAPREDUCE-3013. Removed YarnConfiguration.YARN_SECURITY_INFO and its usage as it doesn't affect security any more. (vinodkv) 2011-10-05 11:43:05 +00:00
hadoop-yarn-server MAPREDUCE-2738. Added the missing cluster level statisticss on the RM web UI. Contributed by Robert Joseph Evans. 2011-10-05 14:01:32 +00:00
hadoop-yarn-site MAPREDUCE-3134. Added documentation the CapacityScheduler. 2011-10-03 19:35:41 +00:00
pom.xml MAPREDUCE-2889. Added documentation for writing new YARN applications. Contributed by Hitesh Shah. 2011-10-01 05:22:50 +00:00
README MAPREDUCE-2930. Added the ability to be able to generate graphs from the state-machine definitions. Contributed by Binglin Chang. 2011-09-21 08:37:00 +00:00

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

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

Setup
-----
Install protobuf 2.4.0a or higher (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)
Installing protoc requires gcc 4.1.x or higher.
If the make step fails with (Valid until a fix is released for protobuf 2.4.0a)
    ./google/protobuf/descriptor.h:1152: error:
    `google::protobuf::internal::Mutex*google::protobuf::DescriptorPool::mutex_'
    is private
  Replace descriptor.cc with http://protobuf.googlecode.com/svn-history/r380/trunk/src/google/protobuf/descriptor.cc


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
skip native build: mvn -fn install -P-cbuild
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 (combined: mvn clean install assembly:assembly)

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