package org.apache.solr.store.hdfs;
/*
* 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.
*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.lucene.store.BaseDirectory;
import org.apache.lucene.store.BufferedIndexOutput;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.store.NoLockFactory;
import org.apache.lucene.util.IOUtils;
import org.apache.solr.store.blockcache.CustomBufferedIndexInput;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HdfsDirectory extends BaseDirectory {
public static Logger LOG = LoggerFactory.getLogger(HdfsDirectory.class);
public static final int BUFFER_SIZE = 8192;
private static final String LF_EXT = ".lf";
protected static final String SEGMENTS_GEN = "segments.gen";
protected Path hdfsDirPath;
protected Configuration configuration;
private final FileSystem fileSystem;
public HdfsDirectory(Path hdfsDirPath, Configuration configuration)
throws IOException {
setLockFactory(NoLockFactory.getNoLockFactory());
this.hdfsDirPath = hdfsDirPath;
this.configuration = configuration;
fileSystem = FileSystem.newInstance(hdfsDirPath.toUri(), configuration);
while (true) {
try {
if (!fileSystem.exists(hdfsDirPath)) {
boolean success = fileSystem.mkdirs(hdfsDirPath);
if (!success) {
throw new RuntimeException("Could not create directory: " + hdfsDirPath);
}
} else {
fileSystem.mkdirs(hdfsDirPath); // check for safe mode
}
break;
} catch (RemoteException e) {
if (e.getClassName().equals("org.apache.hadoop.hdfs.server.namenode.SafeModeException")) {
LOG.warn("The NameNode is in SafeMode - Solr will wait 5 seconds and try again.");
try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
Thread.interrupted();
}
continue;
}
org.apache.solr.util.IOUtils.closeQuietly(fileSystem);
throw new RuntimeException(
"Problem creating directory: " + hdfsDirPath, e);
} catch (Exception e) {
org.apache.solr.util.IOUtils.closeQuietly(fileSystem);
throw new RuntimeException(
"Problem creating directory: " + hdfsDirPath, e);
}
}
}
@Override
public void close() throws IOException {
LOG.info("Closing hdfs directory {}", hdfsDirPath);
fileSystem.close();
}
@Override
public IndexOutput createOutput(String name, IOContext context)
throws IOException {
if (SEGMENTS_GEN.equals(name)) {
return new NullIndexOutput();
}
HdfsFileWriter writer = new HdfsFileWriter(getFileSystem(), new Path(
hdfsDirPath, name));
return new HdfsIndexOutput(writer);
}
private String[] getNormalNames(List<String> files) {
int size = files.size();
for (int i = 0; i < size; i++) {
String str = files.get(i);
files.set(i, toNormalName(str));
}
return files.toArray(new String[] {});
}
private String toNormalName(String name) {
if (name.endsWith(LF_EXT)) {
return name.substring(0, name.length() - 3);
}
return name;
}
@Override
public IndexInput openInput(String name, IOContext context)
throws IOException {
return openInput(name, BUFFER_SIZE);
}
private IndexInput openInput(String name, int bufferSize) throws IOException {
return new HdfsIndexInput(name, getFileSystem(), new Path(
hdfsDirPath, name), BUFFER_SIZE);
}
@Override
public void deleteFile(String name) throws IOException {
Path path = new Path(hdfsDirPath, name);
LOG.debug("Deleting {}", path);
getFileSystem().delete(path, false);
}
@Override
public boolean fileExists(String name) throws IOException {
return getFileSystem().exists(new Path(hdfsDirPath, name));
}
@Override
public long fileLength(String name) throws IOException {
return HdfsFileReader.getLength(getFileSystem(),
new Path(hdfsDirPath, name));
}
public long fileModified(String name) throws IOException {
FileStatus fileStatus = getFileSystem().getFileStatus(
new Path(hdfsDirPath, name));
return fileStatus.getModificationTime();
}
@Override
public String[] listAll() throws IOException {
FileStatus[] listStatus = getFileSystem().listStatus(hdfsDirPath);
List<String> files = new ArrayList<>();
if (listStatus == null) {
return new String[] {};
}
for (FileStatus status : listStatus) {
if (!status.isDirectory()) {
files.add(status.getPath().getName());
}
}
return getNormalNames(files);
}
public Path getHdfsDirPath() {
return hdfsDirPath;
}
public FileSystem getFileSystem() {
return fileSystem;
}
public Configuration getConfiguration() {
return configuration;
}
static class HdfsIndexInput extends CustomBufferedIndexInput {
public static Logger LOG = LoggerFactory
.getLogger(HdfsIndexInput.class);
private final Path path;
private final FSDataInputStream inputStream;
private final long length;
private boolean clone = false;
public HdfsIndexInput(String name, FileSystem fileSystem, Path path,
int bufferSize) throws IOException {
super(name);
this.path = path;
LOG.debug("Opening normal index input on {}", path);
FileStatus fileStatus = fileSystem.getFileStatus(path);
length = fileStatus.getLen();
inputStream = fileSystem.open(path, bufferSize);
}
@Override
protected void readInternal(byte[] b, int offset, int length)
throws IOException {
inputStream.readFully(getFilePointer(), b, offset, length);
}
@Override
protected void seekInternal(long pos) throws IOException {
}
@Override
protected void closeInternal() throws IOException {
LOG.debug("Closing normal index input on {}", path);
if (!clone) {
inputStream.close();
}
}
@Override
public long length() {
return length;
}
@Override
public IndexInput clone() {
HdfsIndexInput clone = (HdfsIndexInput) super.clone();
clone.clone = true;
return clone;
}
}
static class HdfsIndexOutput extends BufferedIndexOutput {
private HdfsFileWriter writer;
public HdfsIndexOutput(HdfsFileWriter writer) {
this.writer = writer;
}
@Override
public void close() throws IOException {
IOException priorE = null;
try {
super.close();
} catch (IOException ioe) {
priorE = ioe;
} finally {
IOUtils.closeWhileHandlingException(priorE, writer);
}
}
@Override
protected void flushBuffer(byte[] b, int offset, int len)
throws IOException {
writer.writeBytes(b, offset, len);
}
@Override
public long length() throws IOException {
return writer.length();
}
}
@Override
public void sync(Collection<String> names) throws IOException {
LOG.debug("Sync called on {}", Arrays.toString(names.toArray()));
}
}