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* 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,
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package org.apache.pig.backend.hadoop.datastorage;
import java.net.URI;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Enumeration;
import java.util.Map;
import java.util.HashMap;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.dfs.DistributedFileSystem;
import org.apache.hadoop.conf.Configuration;
import org.apache.pig.PigException;
import org.apache.pig.backend.datastorage.ContainerDescriptor;
import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.datastorage.DataStorageException;
import org.apache.pig.backend.datastorage.ElementDescriptor;
public class HDataStorage implements DataStorage {
private static final String FILE_SYSTEM_LOCATION = "fs.default.name";
private FileSystem fs;
private Configuration configuration;
private Properties properties;
private URI uri;
public HDataStorage(URI uri, Properties properties) {
this.properties = properties;
this.uri = uri;
init();
}
public HDataStorage(Properties properties) {
this.properties = properties;
init();
}
public void init() {
// check if name node is set, if not we set local as fail back
String nameNode = this.properties.getProperty(FILE_SYSTEM_LOCATION);
if (nameNode == null || nameNode.length() == 0) {
nameNode = "local";
}
this.configuration = ConfigurationUtil.toConfiguration(this.properties);
try {
if (this.uri != null) {
this.fs = FileSystem.get(this.uri, this.configuration);
} else {
this.fs = FileSystem.get(this.configuration);
}
} catch (IOException e) {
throw new RuntimeException("Failed to create DataStorage", e);
}
short defaultReplication = fs.getDefaultReplication();
properties.setProperty(DEFAULT_REPLICATION_FACTOR_KEY, (new Short(
defaultReplication)).toString());
}
public void close() throws IOException {
fs.close();
}
public Properties getConfiguration() {
return this.properties;
}
public void updateConfiguration(Properties newConfiguration)
throws DataStorageException {
// TODO sgroschupf 25Feb2008 this method is never called and
// I'm even not sure if hadoop would support that, I doubt it.
if (newConfiguration == null) {
return;
}
Enumeration<Object> newKeys = newConfiguration.keys();
while (newKeys.hasMoreElements()) {
String key = (String) newKeys.nextElement();
String value = null;
value = newConfiguration.getProperty(key);
fs.getConf().set(key,value);
}
}
public Map<String, Object> getStatistics() throws IOException {
Map<String, Object> stats = new HashMap<String, Object>();
long usedBytes = fs.getUsed();
stats.put(USED_BYTES_KEY , new Long(usedBytes).toString());
if (fs instanceof DistributedFileSystem) {
DistributedFileSystem dfs = (DistributedFileSystem) fs;
long rawCapacityBytes = dfs.getRawCapacity();
stats.put(RAW_CAPACITY_KEY, new Long(rawCapacityBytes).toString());
long rawUsedBytes = dfs.getRawUsed();
stats.put(RAW_USED_KEY, new Long(rawUsedBytes).toString());
}
return stats;
}
public ElementDescriptor asElement(String name) throws DataStorageException {
if (this.isContainer(name)) {
return new HDirectory(this, name);
}
else {
return new HFile(this, name);
}
}
public ElementDescriptor asElement(ElementDescriptor element)
throws DataStorageException {
return asElement(element.toString());
}
public ElementDescriptor asElement(String parent,
String child)
throws DataStorageException {
return asElement((new Path(parent, child)).toString());
}
public ElementDescriptor asElement(ContainerDescriptor parent,
String child)
throws DataStorageException {
return asElement(parent.toString(), child);
}
public ElementDescriptor asElement(ContainerDescriptor parent,
ElementDescriptor child)
throws DataStorageException {
return asElement(parent.toString(), child.toString());
}
public ContainerDescriptor asContainer(String name)
throws DataStorageException {
return new HDirectory(this, name);
}
public ContainerDescriptor asContainer(ContainerDescriptor container)
throws DataStorageException {
return new HDirectory(this, container.toString());
}
public ContainerDescriptor asContainer(String parent,
String child)
throws DataStorageException {
return new HDirectory(this, parent, child);
}
public ContainerDescriptor asContainer(ContainerDescriptor parent,
String child)
throws DataStorageException {
return new HDirectory(this, parent.toString(), child);
}
public ContainerDescriptor asContainer(ContainerDescriptor parent,
ContainerDescriptor child)
throws DataStorageException {
return new HDirectory(this, parent.toString(), child.toString());
}
public void setActiveContainer(ContainerDescriptor container) {
fs.setWorkingDirectory(new Path(container.toString()));
}
public ContainerDescriptor getActiveContainer() {
return new HDirectory(this, fs.getWorkingDirectory());
}
public boolean isContainer(String name) throws DataStorageException {
boolean isContainer = false;
Path path = new Path(name);
try {
if ((this.fs.exists(path)) && (! this.fs.isFile(path))) {
isContainer = true;
}
}
catch (IOException e) {
int errCode = 6007;
String msg = "Unable to check name " + name;
throw new DataStorageException(msg, errCode, PigException.REMOTE_ENVIRONMENT, e);
}
return isContainer;
}
public HPath[] asCollection(String pattern) throws DataStorageException {
try {
FileStatus[] paths = this.fs.globStatus(new Path(pattern));
if (paths == null)
return new HPath[0];
List<HPath> hpaths = new ArrayList<HPath>();
for (int i = 0; i < paths.length; ++i) {
HPath hpath = (HPath)this.asElement(paths[i].getPath().toString());
if (!hpath.systemElement()) {
hpaths.add(hpath);
}
}
return hpaths.toArray(new HPath[hpaths.size()]);
} catch (IOException e) {
int errCode = 6008;
String msg = "Failed to obtain glob for " + pattern;
throw new DataStorageException(msg, errCode, PigException.REMOTE_ENVIRONMENT, e);
}
}
public FileSystem getHFS() {
return fs;
}
}