hadoop/hadoop-yarn-project/hadoop-yarn
Sunil G 45cf3de2e9 YARN-9833. Race condition when DirectoryCollection.checkDirs() runs during container launch. Contributed by Peter Bacsko.
(cherry picked from commit c474e24c0b)
2019-09-18 09:23:46 +05:30
..
bin YARN-7773. YARN Federation used Mysql as state store throw exception, Unknown column 'homeSubCluster' in 'field list'. Contributed by Yiran Wu. 2018-08-24 07:10:02 +05:30
conf YARN-2255. YARN Audit logging not added to log4j.properties. Contributed by Aihua Xu. 2019-09-18 09:20:37 +08:00
dev-support HADOOP-16213. Update guava to 27.0-jre. Contributed by Gabor Bota. 2019-06-13 07:38:43 -06:00
hadoop-yarn-api YARN-8016. Refine PlacementRule interface and add a app-name queue mapping rule as an example. (Zian Chen via wangda) 2019-09-09 19:59:50 -07:00
hadoop-yarn-applications YARN-9837. Fixed reading YARN Service JSON spec file larger than 128k. 2019-09-17 13:17:13 -04:00
hadoop-yarn-client Preparing for 3.1.4 development 2019-09-04 16:11:36 +08:00
hadoop-yarn-common YARN-8995. Log events info in AsyncDispatcher when event queue size cumulatively reaches a certain number every time(addendum). Contributed by Jonathan Hung. 2019-09-07 08:19:02 +08:00
hadoop-yarn-registry Preparing for 3.1.4 development 2019-09-04 16:11:36 +08:00
hadoop-yarn-server YARN-9833. Race condition when DirectoryCollection.checkDirs() runs during container launch. Contributed by Peter Bacsko. 2019-09-18 09:23:46 +05:30
hadoop-yarn-site YARN-8361. Change App Name Placement Rule to use App Name instead of App Id for configuration. (Zian Chen via wangda) 2019-09-09 20:00:33 -07:00
hadoop-yarn-ui Preparing for 3.1.4 development 2019-09-04 16:11:36 +08:00
shellprofile.d HADOOP-12930. Dynamic subcommands for hadoop shell scripts (aw) 2016-05-16 17:54:45 -07:00
README YARN-6943. Update Yarn to YARN in documentation. Contributed by Chetna Chaudhari. 2017-10-04 07:01:54 +09:00
pom.xml Preparing for 3.1.4 development 2019-09-04 16:11:36 +08:00

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