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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 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)