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Merge pull request #1196 from twitter/klin_execution_tutorial
Add a new ExecutionApp tutorial
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| set -e # first error should stop execution of this script | ||
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| # Identify the bin dir in the distribution, and source the common include script | ||
| BASE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. && pwd )" | ||
| source ${BASE_DIR}/scripts/common.sh | ||
| SHORT_SCALA_VERSION=${TRAVIS_SCALA_VERSION%.*} | ||
| SCALDING_VERSION=`cat ${BASE_DIR}/version.sbt` | ||
| SCALDING_VERSION=${SCALDING_VERSION#*\"} | ||
| SCALDING_VERSION=${SCALDING_VERSION%\"} | ||
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| # also trap errors, to reenable terminal settings | ||
| trap onExit ERR | ||
| export CLASSPATH=tutorial/execution-tutorial/target/scala-${SHORT_SCALA_VERSION}/execution-tutorial-assembly-${SCALDING_VERSION}.jar | ||
| time java -jar tutorial/execution-tutorial/target/scala-${SHORT_SCALA_VERSION}/execution-tutorial-assembly-${SCALDING_VERSION}.jar \ | ||
| com.twitter.scalding.tutorial.MyExecJob --local \ | ||
| --input tutorial/data/hello.txt \ | ||
| --output tutorial/data/execution_output.txt | ||
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| # restore stty | ||
| SCALA_EXIT_STATUS=0 | ||
| onExit | ||
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| /* | ||
| Copyright 2012 Twitter, Inc. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
| package com.twitter.scalding.tutorial | ||
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| import java.io._ | ||
| import scala.util.{Failure, Success} | ||
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| import com.twitter.scalding._ | ||
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| /** | ||
| Tutorial of using Execution | ||
| This tutorial gives an example of use Execution to do MapReduce word count. | ||
| Instead of writing the results in reducers, it writes the data at submitter node. | ||
| To test it, first build the assembly jar from root directory: | ||
| ./sbt execution-tutorial/assembly | ||
| Run: | ||
| scala -classpath tutorial/execution-tutorial/target/execution-tutorial-assembly-0.13.1.jar \ | ||
| com.twitter.scalding.tutorial.MyExecJob --local \ | ||
| --input tutorial/data/hello.txt \ | ||
| --output tutorial/data/execution_output.txt | ||
| **/ | ||
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| object MyExecJob extends ExecutionApp { | ||
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| override def job = Execution.getConfig.flatMap { config => | ||
| val args = config.getArgs | ||
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| TypedPipe.from(TextLine(args("input"))) | ||
| .flatMap(_.split("\\s+")) | ||
| .map((_, 1L)) | ||
| .sumByKey | ||
| .toIterableExecution | ||
| // toIterableExecution will materialize the outputs to submitter node when finish. | ||
| // We can also write the outputs on HDFS via .writeExecution(TypedTsv(args("output"))) | ||
| .onComplete { t => t match { | ||
| case Success(iter) => | ||
| val file = new PrintWriter(new File(args("output"))) | ||
| iter.foreach { case (k, v) => | ||
| file.write(s"$k\t$v\n") | ||
| } | ||
| file.close | ||
| case Failure(e) => println("Error: " + e.toString) | ||
| } | ||
| } | ||
| // use the result and map it to a Unit. Otherwise the onComplete call won't happen | ||
| .unit | ||
| } | ||
| } | ||
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