mirror of
https://github.com/apache/zeppelin
synced 2026-05-24 09:38:26 +00:00
Initial version of a ScaldingInterpreter running in local mode. Need to get console output next.
And add tests, and make it work for HDFS.
This commit is contained in:
Sriram Krishnan
parent
721dcb7bcf
commit
35fc032d7e
2 changed files with 242 additions and 5 deletions
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@ -33,6 +33,18 @@
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<name>Zeppelin: Scalding interpreter</name>
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<url>http://zeppelin.incubator.apache.org</url>
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<properties>
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<scala.version>2.10.5</scala.version>
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</properties>
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<repositories>
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<repository>
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<id>conjars</id>
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<name>Concurrent Maven Repo</name>
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<url>http://conjars.org/repo</url>
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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>${project.groupId}</groupId>
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@ -62,6 +74,36 @@
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<artifactId>junit</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.twitter</groupId>
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<artifactId>scalding-core_2.10</artifactId>
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<version>0.15.1-RC13</version>
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</dependency>
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<dependency>
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<groupId>com.twitter</groupId>
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<artifactId>scalding-repl_2.10</artifactId>
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<version>0.15.1-RC13</version>
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</dependency>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-library</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-compiler</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-reflect</artifactId>
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<version>${scala.version}</version>
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</dependency>
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</dependencies>
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<build>
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@ -128,6 +170,33 @@
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</execution>
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</executions>
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</plugin>
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<!-- Plugin to compile Scala code -->
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<plugin>
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<groupId>org.scala-tools</groupId>
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<artifactId>maven-scala-plugin</artifactId>
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<executions>
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<execution>
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<id>compile</id>
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<goals>
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<goal>compile</goal>
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</goals>
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<phase>compile</phase>
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</execution>
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<execution>
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<id>test-compile</id>
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<goals>
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<goal>testCompile</goal>
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</goals>
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<phase>test-compile</phase>
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</execution>
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<execution>
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<phase>process-resources</phase>
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<goals>
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<goal>compile</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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@ -17,8 +17,14 @@
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package org.apache.zeppelin.scalding;
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import java.io.File;
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import java.util.Properties;
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import java.util.List;
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import java.util.LinkedList;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import org.apache.zeppelin.interpreter.Interpreter;
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import org.apache.zeppelin.interpreter.InterpreterContext;
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@ -29,8 +35,15 @@ import org.apache.zeppelin.scheduler.SchedulerFactory;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.twitter.scalding.ScaldingILoop;
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import scala.Some;
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import scala.tools.nsc.Settings;
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import scala.tools.nsc.settings.MutableSettings.BooleanSetting;
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import scala.tools.nsc.settings.MutableSettings.PathSetting;
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/**
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* Scalding interpreter for Zeppelin.
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* Scalding interpreter for Zeppelin. Based off the Spark interpreter code.
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*
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* @author sriramkrishnan
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*
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@ -42,12 +55,96 @@ public class ScaldingInterpreter extends Interpreter {
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Interpreter.register("scalding", ScaldingInterpreter.class.getName());
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}
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private ScaldingILoop interpreter;
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public ScaldingInterpreter(Properties property) {
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super(property);
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}
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@Override
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public void open() {}
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public void open() {
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URL[] urls = getClassloaderUrls();
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// Very nice discussion about how scala compiler handle classpath
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// https://groups.google.com/forum/#!topic/scala-user/MlVwo2xCCI0
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/*
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* > val env = new nsc.Settings(errLogger) > env.usejavacp.value = true > val p = new
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* Interpreter(env) > p.setContextClassLoader > Alternatively you can set the class path through
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* nsc.Settings.classpath.
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*
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* >> val settings = new Settings() >> settings.usejavacp.value = true >>
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* settings.classpath.value += File.pathSeparator + >> System.getProperty("java.class.path") >>
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* val in = new Interpreter(settings) { >> override protected def parentClassLoader =
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* getClass.getClassLoader >> } >> in.setContextClassLoader()
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*/
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Settings settings = new Settings();
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// set classpath for scala compiler
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PathSetting pathSettings = settings.classpath();
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String classpath = "";
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List<File> paths = currentClassPath();
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for (File f : paths) {
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if (classpath.length() > 0) {
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classpath += File.pathSeparator;
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}
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classpath += f.getAbsolutePath();
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}
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if (urls != null) {
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for (URL u : urls) {
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if (classpath.length() > 0) {
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classpath += File.pathSeparator;
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}
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classpath += u.getFile();
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}
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}
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pathSettings.v_$eq(classpath);
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settings.scala$tools$nsc$settings$ScalaSettings$_setter_$classpath_$eq(pathSettings);
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// set classloader for scala compiler
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settings.explicitParentLoader_$eq(new Some<ClassLoader>(Thread.currentThread()
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.getContextClassLoader()));
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BooleanSetting b = (BooleanSetting) settings.usejavacp();
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b.v_$eq(true);
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settings.scala$tools$nsc$settings$StandardScalaSettings$_setter_$usejavacp_$eq(b);
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/* Scalding interpreter */
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interpreter = new ScaldingILoop();
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interpreter.settings_$eq(settings);
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interpreter.createInterpreter();
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}
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private List<File> currentClassPath() {
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List<File> paths = classPath(Thread.currentThread().getContextClassLoader());
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String[] cps = System.getProperty("java.class.path").split(File.pathSeparator);
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if (cps != null) {
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for (String cp : cps) {
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paths.add(new File(cp));
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}
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}
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return paths;
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}
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private List<File> classPath(ClassLoader cl) {
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List<File> paths = new LinkedList<File>();
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if (cl == null) {
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return paths;
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}
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if (cl instanceof URLClassLoader) {
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URLClassLoader ucl = (URLClassLoader) cl;
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URL[] urls = ucl.getURLs();
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if (urls != null) {
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for (URL url : urls) {
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paths.add(new File(url.getFile()));
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}
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}
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}
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return paths;
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}
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@Override
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public void close() {}
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@ -55,9 +152,80 @@ public class ScaldingInterpreter extends Interpreter {
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@Override
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public InterpreterResult interpret(String cmd, InterpreterContext contextInterpreter) {
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logger.debug("Run Scalding command '" + cmd + "'");
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System.out.println("Running Scalding Interpreter!");
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return new InterpreterResult(InterpreterResult.Code.SUCCESS, "Success!!");
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logger.info("Run Scalding command '" + cmd + "'");
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if (cmd == null || cmd.trim().length() == 0) {
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return new InterpreterResult(Code.SUCCESS);
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}
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return interpret(cmd.split("\n"), contextInterpreter);
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}
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public InterpreterResult interpret(String[] lines, InterpreterContext context) {
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synchronized (this) {
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InterpreterResult r = interpretInput(lines);
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return r;
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}
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}
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public InterpreterResult interpretInput(String[] lines) {
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// add print("") to make sure not finishing with comment
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// see https://github.com/NFLabs/zeppelin/issues/151
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String[] linesToRun = new String[lines.length + 1];
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for (int i = 0; i < lines.length; i++) {
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linesToRun[i] = lines[i];
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}
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linesToRun[lines.length] = "print(\"\")";
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Code r = null;
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String incomplete = "";
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for (int l = 0; l < linesToRun.length; l++) {
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String s = linesToRun[l];
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// check if next line starts with "." (but not ".." or "./") it is treated as an invocation
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if (l + 1 < linesToRun.length) {
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String nextLine = linesToRun[l + 1].trim();
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if (nextLine.startsWith(".") && !nextLine.startsWith("..") && !nextLine.startsWith("./")) {
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incomplete += s + "\n";
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continue;
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}
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}
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scala.tools.nsc.interpreter.Results.Result res = null;
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try {
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res = interpreter.intp().interpret(incomplete + s);
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("Interpreter exception: ", e);
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return new InterpreterResult(Code.ERROR, e.getMessage());
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}
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r = getResultCode(res);
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if (r == Code.ERROR) {
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return new InterpreterResult(r);
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} else if (r == Code.INCOMPLETE) {
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incomplete += s + "\n";
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} else {
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incomplete = "";
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}
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}
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if (r == Code.INCOMPLETE) {
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return new InterpreterResult(r, "Incomplete expression");
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} else {
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return new InterpreterResult(r);
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}
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}
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private Code getResultCode(scala.tools.nsc.interpreter.Results.Result r) {
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if (r instanceof scala.tools.nsc.interpreter.Results.Success$) {
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return Code.SUCCESS;
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} else if (r instanceof scala.tools.nsc.interpreter.Results.Incomplete$) {
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return Code.INCOMPLETE;
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} else {
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return Code.ERROR;
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}
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}
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@Override
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