hadoop/hadoop-mapreduce-project/hadoop-yarn
Thomas Graves 24d6a8b29c MAPREDUCE-4008. ResourceManager throws MetricsException on start up saying QueueMetrics MBean already exists (Devaraj K via tgraves)
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1326707 13f79535-47bb-0310-9956-ffa450edef68
2012-04-16 18:02:51 +00:00
..
bin MAPREDUCE-4076. Stream job fails with ZipException when use yarn jar command (Devaraj K via bobby) 2012-04-10 21:30:05 +00:00
conf MAPREDUCE-3366. Mapreduce component should use consistent directory structure layout as HDFS/common (Eric Yang via mahadev) 2011-12-16 09:09:28 +00:00
dev-support MAPREDUCE-3034. Ensure NodeManager reboots itself on direction from ResourceManager. Contributed by Devaraj K & Eric Payne. 2012-03-06 00:52:10 +00:00
hadoop-yarn-api MAPREDUCE-4140. mapreduce classes incorrectly importing "clover.org.apache.*" classes. Contributed by Patrick Hunt 2012-04-12 16:22:25 +00:00
hadoop-yarn-applications MAPREDUCE-3869. Fix classpath for DistributedShell application. (Contributed by Devaraj K) 2012-04-10 00:01:49 +00:00
hadoop-yarn-common MAPREDUCE-4105. Yarn RackResolver ignores rack configurations. Contributed by Ahmed Radwan. 2012-04-09 23:32:43 +00:00
hadoop-yarn-server MAPREDUCE-4008. ResourceManager throws MetricsException on start up saying QueueMetrics MBean already exists (Devaraj K via tgraves) 2012-04-16 18:02:51 +00:00
hadoop-yarn-site MAPREDUCE-4103. Fix HA docs for changes to shell command fencer args. Contributed by Todd Lipcon. 2012-04-04 18:46:22 +00:00
README MAPREDUCE-3014. Rename and invert logic of '-cbuild' profile to 'native' and off by default. Contributed by Alejandro Abdelnur. 2011-10-07 17:33:10 +00:00
pom.xml MAPREDUCE-4147. YARN should not have a compile-time dependency on HDFS. 2012-04-13 00:10:30 +00:00

README

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

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

Setup
-----
Install protobuf 2.4.0a 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
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