/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.pig.impl;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Vector;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.pig.FuncSpec;
import org.apache.pig.Main;
import org.apache.pig.ExecType;
import org.apache.pig.PigException;
import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.datastorage.DataStorageException;
import org.apache.pig.backend.datastorage.ElementDescriptor;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.executionengine.ExecutionEngine;
import org.apache.pig.backend.hadoop.datastorage.HDataStorage;
import org.apache.pig.backend.hadoop.executionengine.HExecutionEngine;
//import org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher;
//import org.apache.pig.backend.hadoop.executionengine.mapreduceExec.PigMapReduce;
import org.apache.pig.backend.local.executionengine.LocalExecutionEngine;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher;
import org.apache.pig.backend.hadoop.streaming.HadoopExecutableManager;
import org.apache.pig.impl.logicalLayer.LogicalPlanBuilder;
import org.apache.pig.impl.streaming.ExecutableManager;
import org.apache.pig.impl.streaming.StreamingCommand;
import org.apache.pig.impl.util.JarManager;
import org.apache.pig.impl.util.WrappedIOException;
public class PigContext implements Serializable, FunctionInstantiator {
private static final long serialVersionUID = 1L;
private transient final Log log = LogFactory.getLog(getClass());
public static final String JOB_NAME = "jobName";
public static final String JOB_NAME_PREFIX= "PigLatin";
/* NOTE: we only serialize some of the stuff
*
*(to make it smaller given that it's not all needed on the Hadoop side,
* and also because some is not serializable e.g. the Configuration)
*/
//one of: local, mapreduce, pigbody
private ExecType execType;;
// configuration for connecting to hadoop
private Properties conf = new Properties();
// extra jar files that are needed to run a job
transient public List<URL> extraJars = new LinkedList<URL>();
// The jars that should not be merged in. (Some functions may come from pig.jar and we don't want the whole jar file.)
transient public Vector<String> skipJars = new Vector<String>(2);
//main file system that jobs and shell commands access
transient private DataStorage dfs;
// local file system, where jar files, etc. reside
transient private DataStorage lfs;
// handle to the back-end
transient private ExecutionEngine executionEngine;
private String jobName = JOB_NAME_PREFIX; // can be overwritten by users
private Properties properties;
/**
* a table mapping function names to function specs.
*/
private Map<String, FuncSpec> definedFunctions = new HashMap<String, FuncSpec>();
/**
* a table mapping names to streaming commands.
*/
private Map<String, StreamingCommand> definedCommands =
new HashMap<String, StreamingCommand>();
private static ArrayList<String> packageImportList = new ArrayList<String>();
public boolean debug = true;
// Says, wether we're processing an explain right now. Explain
// might skip some check in the logical plan validation (file
// existence checks, etc).
public boolean inExplain = false;
private String last_alias = null;
// List of paths skipped for automatic shipping
List<String> skippedShipPaths = new ArrayList<String>();
public PigContext() {
this(ExecType.MAPREDUCE, new Properties());
}
public PigContext(ExecType execType, Properties properties){
this.execType = execType;
this.properties = properties;
String pigJar = JarManager.findContainingJar(Main.class);
String hadoopJar = JarManager.findContainingJar(FileSystem.class);
if (pigJar != null) {
skipJars.add(pigJar);
if (!pigJar.equals(hadoopJar))
skipJars.add(hadoopJar);
}
executionEngine = null;
// Add the default paths to be skipped for auto-shipping of commands
skippedShipPaths.add("/bin");
skippedShipPaths.add("/usr/bin");
skippedShipPaths.add("/usr/local/bin");
skippedShipPaths.add("/sbin");
skippedShipPaths.add("/usr/sbin");
skippedShipPaths.add("/usr/local/sbin");
}
static{
packageImportList.add("");
packageImportList.add("org.apache.pig.builtin.");
packageImportList.add("com.yahoo.pig.yst.sds.ULT.");
packageImportList.add("org.apache.pig.impl.builtin.");
}
public void connect() throws ExecException {
switch (execType) {
case LOCAL:
{
lfs = new HDataStorage(URI.create("file:///"),
new Properties());
dfs = lfs;
executionEngine = new LocalExecutionEngine(this);
}
break;
case MAPREDUCE:
{
executionEngine = new HExecutionEngine (this);
executionEngine.init();
dfs = executionEngine.getDataStorage();
lfs = new HDataStorage(URI.create("file:///"),
new Properties());
}
break;
default:
{
int errCode = 2040;
String msg = "Unkown exec type: " + execType;
throw new ExecException(msg, errCode, PigException.BUG);
}
}
}
public void setJobtrackerLocation(String newLocation) {
Properties trackerLocation = new Properties();
trackerLocation.setProperty("mapred.job.tracker", newLocation);
try {
executionEngine.updateConfiguration(trackerLocation);
}
catch (ExecException e) {
log.error("Failed to set tracker at: " + newLocation);
}
}
public void addJar(String path) throws MalformedURLException {
if (path != null) {
URL resource = (new File(path)).toURI().toURL();
addJar(resource);
}
}
public void addJar(URL resource) throws MalformedURLException{
if (resource != null) {
extraJars.add(resource);
LogicalPlanBuilder.classloader = createCl(null);
}
}
public void rename(String oldName, String newName) throws IOException {
if (oldName.equals(newName)) {
return;
}
System.out.println("Renaming " + oldName + " to " + newName);
ElementDescriptor dst = null;
ElementDescriptor src = null;
try {
dst = dfs.asElement(newName);
src = dfs.asElement(oldName);
}
catch (DataStorageException e) {
byte errSrc = getErrorSource();
int errCode = 0;
switch(errSrc) {
case PigException.REMOTE_ENVIRONMENT:
errCode = 6005;
break;
case PigException.USER_ENVIRONMENT:
errCode = 4005;
break;
default:
errCode = 2038;
break;
}
String msg = "Unable to rename " + oldName + " to " + newName;
throw new ExecException(msg, errCode, errSrc, e);
}
if (dst.exists()) {
dst.delete();
}
src.rename(dst);
}
public void copy(String src, String dst, boolean localDst) throws IOException {
DataStorage dstStorage = dfs;
if (localDst) {
dstStorage = lfs;
}
ElementDescriptor srcElement = null;
ElementDescriptor dstElement = null;
try {
srcElement = dfs.asElement(src);
dstElement = dstStorage.asElement(dst);
}
catch (DataStorageException e) {
byte errSrc = getErrorSource();
int errCode = 0;
switch(errSrc) {
case PigException.REMOTE_ENVIRONMENT:
errCode = 6006;
break;
case PigException.USER_ENVIRONMENT:
errCode = 4006;
break;
default:
errCode = 2039;
break;
}
String msg = "Unable to copy " + src + " to " + dst;
throw new ExecException(msg, errCode, errSrc, e);
}
srcElement.copy(dstElement, this.properties, false);
}
public ExecutionEngine getExecutionEngine() {
return executionEngine;
}
public DataStorage getDfs() {
return dfs;
}
public DataStorage getLfs() {
return lfs;
}
public DataStorage getFs() {
if(execType == ExecType.LOCAL) {
return lfs;
} else {
return dfs;
}
}
/**
* Provides configuration information.
*
* @return - information about the configuration used to connect to
* execution engine
*/
public Properties getProperties() {
return this.properties;
}
/**
* @deprecated use {@link #getProperties()} instead
*/
public Properties getConf() {
return getProperties();
}
public String getLastAlias() {
return this.last_alias;
}
public void setLastAlias(String value) {
this.last_alias = value;
}
/**
* Defines an alias for the given function spec. This
* is useful for functions that require arguments to the
* constructor.
*
* @param function - the new function alias to define.
* @param functionSpec - the FuncSpec object representing the name of
* the function class and any arguments to constructor.
*
*/
public void registerFunction(String function, FuncSpec functionSpec) {
if (functionSpec == null) {
definedFunctions.remove(function);
} else {
definedFunctions.put(function, functionSpec);
}
}
/**
* Defines an alias for the given streaming command.
*
* This is useful for complicated streaming command specs.
*
* @param alias - the new command alias to define.
* @param command - the command
*/
public void registerStreamCmd(String alias, StreamingCommand command) {
if (command == null) {
definedCommands.remove(alias);
} else {
definedCommands.put(alias, command);
}
}
/**
* Returns the type of execution currently in effect.
*
* @return current execution type
*/
public ExecType getExecType() {
return execType;
}
/**
* Creates a Classloader based on the passed jarFile and any extra jar files.
*
* @param jarFile
* the jar file to be part of the newly created Classloader. This jar file plus any
* jars in the extraJars list will constitute the classpath.
* @return the new Classloader.
* @throws MalformedURLException
*/
public ClassLoader createCl(String jarFile) throws MalformedURLException {
int len = extraJars.size();
int passedJar = jarFile == null ? 0 : 1;
URL urls[] = new URL[len + passedJar];
if (jarFile != null) {
urls[0] = new URL("file:" + jarFile);
}
for (int i = 0; i < extraJars.size(); i++) {
urls[i + passedJar] = extraJars.get(i);
}
//return new URLClassLoader(urls, PigMapReduce.class.getClassLoader());
return new URLClassLoader(urls, PigContext.class.getClassLoader());
}
public static Class resolveClassName(String name) throws IOException{
for(String prefix: packageImportList) {
Class c;
try {
c = Class.forName(prefix+name,true, LogicalPlanBuilder.classloader);
return c;
}
catch (ClassNotFoundException e) {
// do nothing
}
catch (UnsupportedClassVersionError e) {
int errCode = 1069;
String msg = "Problem resolving class version numbers for class " + name;
throw new ExecException(msg, errCode, PigException.INPUT, e) ;
}
}
// create ClassNotFoundException exception and attach to IOException
// so that we don't need to buble interface changes throughout the code
int errCode = 1070;
String msg = "Could not resolve " + name + " using imports: " + packageImportList;
throw new ExecException(msg, errCode, PigException.INPUT);
}
@SuppressWarnings("unchecked")
public static Object instantiateFuncFromSpec(FuncSpec funcSpec) {
Object ret;
String className =funcSpec.getClassName();
String[] args = funcSpec.getCtorArgs();
Class objClass = null ;
try {
objClass = resolveClassName(className);
}
catch(IOException ioe) {
throw new RuntimeException("Cannot instantiate:" + className, ioe) ;
}
try {
// Do normal instantiation
if (args != null && args.length > 0) {
Class paramTypes[] = new Class[args.length];
for (int i = 0; i < paramTypes.length; i++) {
paramTypes[i] = String.class;
}
Constructor c = objClass.getConstructor(paramTypes);
ret = c.newInstance((Object[])args);
} else {
ret = objClass.newInstance();
}
}
catch(NoSuchMethodException nme) {
// Second chance. Try with var arg constructor
try {
Constructor c = objClass.getConstructor(String[].class);
Object[] wrappedArgs = new Object[1] ;
wrappedArgs[0] = args ;
ret = c.newInstance(wrappedArgs);
}
catch(Throwable e){
// bad luck
StringBuilder sb = new StringBuilder();
sb.append("could not instantiate '");
sb.append(className);
sb.append("' with arguments '");
sb.append(args);
sb.append("'");
throw new RuntimeException(sb.toString(), e);
}
}
catch(Throwable e){
// bad luck
StringBuilder sb = new StringBuilder();
sb.append("could not instantiate '");
sb.append(className);
sb.append("' with arguments '");
sb.append(args);
sb.append("'");
throw new RuntimeException(sb.toString(), e);
}
return ret;
}
public static Object instantiateFuncFromSpec(String funcSpec) {
return instantiateFuncFromSpec(new FuncSpec(funcSpec));
}
public Class getClassForAlias(String alias) throws IOException{
String className = null;
FuncSpec funcSpec = null;
if (definedFunctions != null) {
funcSpec = definedFunctions.get(alias);
}
if (funcSpec != null) {
className = funcSpec.getClassName();
}else{
className = FuncSpec.getClassNameFromSpec(alias);
}
return resolveClassName(className);
}
public Object instantiateFuncFromAlias(String alias) throws IOException {
FuncSpec funcSpec;
if (definedFunctions != null && (funcSpec = definedFunctions.get(alias))!=null)
return instantiateFuncFromSpec(funcSpec);
else
return instantiateFuncFromSpec(alias);
}
/**
* Get the {@link StreamingCommand} for the given alias.
*
* @param alias the alias for the <code>StreamingCommand</code>
* @return <code>StreamingCommand</code> for the alias
*/
public StreamingCommand getCommandForAlias(String alias) {
return definedCommands.get(alias);
}
public void setExecType(ExecType execType) {
this.execType = execType;
}
/**
* Create a new {@link ExecutableManager} depending on the ExecType.
*
* @return a new {@link ExecutableManager} depending on the ExecType
* @throws ExecException
*/
public ExecutableManager createExecutableManager() throws ExecException {
ExecutableManager executableManager = null;
switch (execType) {
case LOCAL:
{
executableManager = new ExecutableManager();
}
break;
case MAPREDUCE:
{
executableManager = new HadoopExecutableManager();
}
break;
default:
{
int errCode = 2040;
String msg = "Unkown exec type: " + execType;
throw new ExecException(msg, errCode, PigException.BUG);
}
}
return executableManager;
}
public FuncSpec getFuncSpecFromAlias(String alias) {
FuncSpec funcSpec;
if (definedFunctions != null && (funcSpec = definedFunctions.get(alias))!=null)
return funcSpec;
else
return null;
}
/**
* Add a path to be skipped while automatically shipping binaries for
* streaming.
*
* @param path path to be skipped
*/
public void addPathToSkip(String path) {
skippedShipPaths.add(path);
}
/**
* Get paths which are to skipped while automatically shipping binaries for
* streaming.
*
* @return paths which are to skipped while automatically shipping binaries
* for streaming
*/
public List<String> getPathsToSkip() {
return skippedShipPaths;
}
/**
* Check the execution mode and return the appropriate error source
*
* @return error source
*/
public byte getErrorSource() {
if(execType == ExecType.LOCAL) {
return PigException.USER_ENVIRONMENT;
} else if (execType == ExecType.MAPREDUCE) {
return PigException.REMOTE_ENVIRONMENT;
} else {
return PigException.BUG;
}
}
}