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/*
* 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.streaming;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.pig.builtin.PigStorage;
import org.apache.pig.builtin.PigStreaming;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileLocalizer;
import org.apache.hadoop.util.Shell;
/**
* {@link StreamingCommand} represents the specification of an external
* command to be executed in a Pig Query.
*
* StreamingCommand encapsulates all relevant details of the
* command specified by the user either directly via the STREAM
* operator or indirectly via a DEFINE operator. It includes
* details such as input/output/error specifications and also files to be
* shipped to the cluster and files to be cached.
*/
public class StreamingCommand implements Serializable, Cloneable {
private static final long serialVersionUID = 1L;
// External command to be executed and it's parsed components
String executable;
String[] argv;
// Files to be shipped to the cluster in-order to be executed
List shipSpec = new LinkedList();
// Files to be shipped to the cluster in-order to be executed
List cacheSpec = new LinkedList();
/**
* Handle to communicate with the external process.
*/
public enum Handle {INPUT, OUTPUT}
/**
* Map from the the stdin/stdout/stderr handles to their specifications
*/
Map> handleSpecs =
new TreeMap>();
// Should the stderr of the process be persisted?
boolean persistStderr = false;
// Directory where the process's stderr logs should be persisted.
String logDir;
// Limit on the number of persisted log-files
int logFilesLimit = 100;
public static final int MAX_TASKS = 100;
boolean shipFiles = true;
private PigContext pigContext;
/**
* Create a new StreamingCommand with the given command.
*
* @param pigContext PigContext structure
* @param argv parsed arguments of the command
*/
public StreamingCommand(PigContext pigContext, String[] argv) {
this.pigContext = pigContext;
this.argv = argv;
// Assume that argv[0] is the executable
this.executable = this.argv[0];
}
/**
* Get the command to be executed.
*
* @return the command to be executed
*/
public String getExecutable() {
return executable;
}
/**
* Set the executable for the StreamingCommand.
*
* @param executable the executable for the StreamingCommand
*/
public void setExecutable(String executable) {
this.executable = executable;
}
/**
* Set the command line arguments for the StreamingCommand.
*
* @param argv the command line arguments for the
* StreamingCommand
*/
public void setCommandArgs(String[] argv) {
this.argv = argv;
}
/**
* Get the parsed command arguments.
*
* @return the parsed command arguments as String[]
*/
public String[] getCommandArgs() {
return argv;
}
/**
* Get the list of files which need to be shipped to the cluster.
*
* @return the list of files which need to be shipped to the cluster
*/
public List getShipSpecs() {
return shipSpec;
}
/**
* Get the list of files which need to be cached on the execute nodes.
*
* @return the list of files which need to be cached on the execute nodes
*/
public List getCacheSpecs() {
return cacheSpec;
}
/**
* Add a file to be shipped to the cluster.
*
* Users can use this to distribute executables and other necessary files
* to the clusters.
*
* @param path path of the file to be shipped to the cluster
*/
public void addPathToShip(String path) throws IOException {
// Validate
File file = new File(path);
if (!file.exists()) {
throw new IOException("Invalid ship specification: '" + path +
"' does not exist!");
} else if (file.isDirectory()) {
throw new IOException("Invalid ship specification: '" + path +
"' is a directory and can't be shipped!");
}
shipSpec.add(path);
}
/**
* Add a file to be cached on execute nodes on the cluster. The file is
* assumed to be available at the shared filesystem.
*
* @param path path of the file to be cached on the execute nodes
*/
public void addPathToCache(String path) throws IOException {
// Validate
URI pathUri = null;
URI dfsPath = null;
try {
// On Windows, replace "\" into "/"
if (Shell.WINDOWS) {
path = path.replaceAll("\\\\", "/");
}
pathUri = new URI(path);
// Strip away the URI's _fragment_ and _query_
dfsPath = new URI(pathUri.getScheme(), pathUri.getAuthority(),
pathUri.getPath(), null, null);
} catch (URISyntaxException urise) {
throw new IOException("Invalid cache specification: " + path);
}
boolean exists = false;
try {
exists = FileLocalizer.fileExists(dfsPath.toString(), pigContext);
} catch (IOException ioe) {
// Throw a better error message...
throw new IOException("Invalid cache specification: '" + dfsPath +
"' does not exist!");
}
if (!exists) {
throw new IOException("Invalid cache specification: '" + dfsPath +
"' does not exist!");
} else if (FileLocalizer.isDirectory(dfsPath.toString(), pigContext)) {
throw new IOException("Invalid cache specification: '" + dfsPath +
"' is a directory and can't be cached!");
}
cacheSpec.add(path);
}
/**
* Attach a {@link HandleSpec} to a given {@link Handle}
* @param handle Handle to which the specification is to
* be attached.
* @param handleSpec HandleSpec for the given handle.
*/
public void addHandleSpec(Handle handle, HandleSpec handleSpec) {
List handleSpecList = handleSpecs.get(handle);
if (handleSpecList == null) {
handleSpecList = new LinkedList();
handleSpecs.put(handle, handleSpecList);
}
handleSpecList.add(handleSpec);
}
/**
* Set the input specification for the StreamingCommand.
*
* @param spec input specification
*/
public void setInputSpec(HandleSpec spec) {
List inputSpecs = getHandleSpecs(Handle.INPUT);
if (inputSpecs == null || inputSpecs.size() == 0) {
addHandleSpec(Handle.INPUT, spec);
} else {
inputSpecs.set(0, spec);
}
}
/**
* Get the input specification of the StreamingCommand.
*
* @return input specification of the StreamingCommand
*/
public HandleSpec getInputSpec() {
List inputSpecs = getHandleSpecs(Handle.INPUT);
if (inputSpecs == null || inputSpecs.size() == 0) {
addHandleSpec(Handle.INPUT, new HandleSpec("stdin", PigStreaming.class.getName()));
}
return getHandleSpecs(Handle.INPUT).get(0);
}
/**
* Set the specification for the primary output of the
* StreamingCommand.
*
* @param spec specification for the primary output of the
* StreamingCommand
*/
public void setOutputSpec(HandleSpec spec) {
List outputSpecs = getHandleSpecs(Handle.OUTPUT);
if (outputSpecs == null || outputSpecs.size() == 0) {
addHandleSpec(Handle.OUTPUT, spec);
} else {
outputSpecs.set(0, spec);
}
}
/**
* Get the specification of the primary output of the
* StreamingCommand.
*
* @return specification of the primary output of the
* StreamingCommand
*/
public HandleSpec getOutputSpec() {
List outputSpecs = getHandleSpecs(Handle.OUTPUT);
if (outputSpecs == null || outputSpecs.size() == 0) {
addHandleSpec(Handle.OUTPUT, new HandleSpec("stdout", PigStreaming.class.getName()));
}
return getHandleSpecs(Handle.OUTPUT).get(0);
}
/**
* Get specifications for the given Handle.
*
* @param handle Handle of the stream
* @return specification for the given Handle
*/
public List getHandleSpecs(Handle handle) {
return handleSpecs.get(handle);
}
/**
* Should the stderr of the managed process be persisted?
*
* @return true if the stderr of the managed process should be
* persisted, false otherwise.
*/
public boolean getPersistStderr() {
return persistStderr;
}
/**
* Specify if the stderr of the managed process should be persisted.
*
* @param persistStderr true if the stderr of the managed
* process should be persisted, else false
*/
public void setPersistStderr(boolean persistStderr) {
this.persistStderr = persistStderr;
}
/**
* Get the directory where the log-files of the command are persisted.
*
* @return the directory where the log-files of the command are persisted
*/
public String getLogDir() {
return logDir;
}
/**
* Set the directory where the log-files of the command are persisted.
*
* @param logDir the directory where the log-files of the command are persisted
*/
public void setLogDir(String logDir) {
this.logDir = logDir;
if (this.logDir.startsWith("/")) {
this.logDir = this.logDir.substring(1);
}
setPersistStderr(true);
}
/**
* Get the maximum number of tasks whose stderr logs files are persisted.
*
* @return the maximum number of tasks whose stderr logs files are persisted
*/
public int getLogFilesLimit() {
return logFilesLimit;
}
/**
* Set the maximum number of tasks whose stderr logs files are persisted.
* @param logFilesLimit the maximum number of tasks whose stderr logs files
* are persisted
*/
public void setLogFilesLimit(int logFilesLimit) {
this.logFilesLimit = Math.min(MAX_TASKS, logFilesLimit);
}
/**
* Set whether files should be shipped or not.
*
* @param shipFiles true if files of this command should be
* shipped, false otherwise
*/
public void setShipFiles(boolean shipFiles) {
this.shipFiles = shipFiles;
}
/**
* Get whether files for this command should be shipped or not.
*
* @return true if files of this command should be shipped,
* false otherwise
*/
public boolean getShipFiles() {
return shipFiles;
}
public String toString() {
StringBuffer sb = new StringBuffer();
for (String arg : getCommandArgs()) {
sb.append(arg);
sb.append(" ");
}
sb.append("(" + getInputSpec().toString() + "/"+getOutputSpec() + ")");
return sb.toString();
}
public Object clone() {
try {
StreamingCommand clone = (StreamingCommand)super.clone();
clone.shipSpec = new ArrayList(shipSpec);
clone.cacheSpec = new ArrayList(cacheSpec);
clone.handleSpecs = new HashMap>();
for (Map.Entry> e : handleSpecs.entrySet()) {
List values = new ArrayList();
for (HandleSpec spec : e.getValue()) {
values.add((HandleSpec)spec.clone());
}
clone.handleSpecs.put(e.getKey(), values);
}
return clone;
} catch (CloneNotSupportedException cnse) {
// Shouldn't happen since we do implement Clonable
throw new InternalError(cnse.toString());
}
}
/**
* Specification about the usage of the {@link Handle} to communicate
* with the external process.
*
* It specifies the stream-handle which can be one of stdin/
* stdout/stderr or a named file and also the
* serializer/deserializer specification to be used to read/write data
* to/from the stream.
*/
public static class HandleSpec
implements Comparable, Serializable, Cloneable {
private static final long serialVersionUID = 1L;
String name;
String spec;
/**
* Create a new {@link HandleSpec} with a given name using the default
* {@link PigStorage} serializer/deserializer.
*
* @param handleName name of the handle (one of stdin,
* stdout or a file-path)
*/
public HandleSpec(String handleName) {
this(handleName, PigStreaming.class.getName());
}
/**
* Create a new {@link HandleSpec} with a given name using the default
* {@link PigStorage} serializer/deserializer.
*
* @param handleName name of the handle (one of stdin,
* stdout or a file-path)
* @param spec serializer/deserializer spec
*/
public HandleSpec(String handleName, String spec) {
this.name = handleName;
this.spec = spec;
}
public int compareTo(HandleSpec o) {
return this.name.compareTo(o.name);
}
public String toString() {
return name + "-" + spec;
}
/**
* Get the name of the HandleSpec.
*
* @return the name of the HandleSpec (one of
* stdin, stdout or a file-path)
*/
public String getName() {
return name;
}
/**
* Set the name of the HandleSpec.
*
* @param name name of the HandleSpec (one of
* stdin, stdout or a file-path)
*/
public void setName(String name) {
this.name = name;
}
/**
* Get the serializer/deserializer spec of the HandleSpec.
*
* @return the serializer/deserializer spec of the
* HandleSpec
*/
public String getSpec() {
return spec;
}
/**
* Set the serializer/deserializer spec of the HandleSpec.
*
* @param spec the serializer/deserializer spec of the
* HandleSpec
*/
public void setSpec(String spec) {
this.spec = spec;
}
public boolean equals(Object obj) {
if (obj instanceof HandleSpec){
HandleSpec other = (HandleSpec)obj;
return (other != null && name.equals(other.name) && spec.equals(other.spec));
} else
return false;
}
public int hashCode() {
return name.hashCode();
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException cnse) {
// Shouldn't happen since we do implement Clonable
throw new InternalError(cnse.toString());
}
}
}
}
