| /** |
| * 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.hadoop.raid; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.PositionedReadable; |
| import org.apache.hadoop.fs.Seekable; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.util.Progressable; |
| |
| public class RaidUtils { |
| /** |
| * A {@link Progressable} that does nothing. |
| * |
| * We could have used Reporter.NULL here but that would introduce |
| * a dependency on mapreduce. |
| */ |
| public static class DummyProgressable implements Progressable { |
| /** |
| * Do nothing. |
| */ |
| @Override |
| public void progress() { |
| } |
| } |
| |
| /** |
| * Removes files matching the trash file pattern. |
| */ |
| public static void filterTrash(Configuration conf, List<Path> files) { |
| // Remove files under Trash. |
| String trashPattern = conf.get("raid.blockfixer.trash.pattern", |
| "^/user/.*/\\.Trash.*"); |
| for (Iterator<Path> it = files.iterator(); it.hasNext(); ) { |
| String pathStr = it.next().toString(); |
| if (Pattern.matches(trashPattern, pathStr)) { |
| it.remove(); |
| } |
| } |
| } |
| |
| public static void readTillEnd(InputStream in, byte[] buf, boolean eofOK) |
| throws IOException { |
| int toRead = buf.length; |
| int numRead = 0; |
| while (numRead < toRead) { |
| int nread = in.read(buf, numRead, toRead - numRead); |
| if (nread < 0) { |
| if (eofOK) { |
| // EOF hit, fill with zeros |
| Arrays.fill(buf, numRead, toRead, (byte)0); |
| numRead = toRead; |
| } else { |
| // EOF hit, throw. |
| throw new IOException("Premature EOF"); |
| } |
| } else { |
| numRead += nread; |
| } |
| } |
| } |
| |
| public static void copyBytes( |
| InputStream in, OutputStream out, byte[] buf, long count) |
| throws IOException { |
| for (long bytesRead = 0; bytesRead < count; ) { |
| int toRead = Math.min(buf.length, (int)(count - bytesRead)); |
| IOUtils.readFully(in, buf, 0, toRead); |
| bytesRead += toRead; |
| out.write(buf, 0, toRead); |
| } |
| } |
| |
| public static class ZeroInputStream extends InputStream |
| implements Seekable, PositionedReadable { |
| private long endOffset; |
| private long pos; |
| |
| public ZeroInputStream(long endOffset) { |
| this.endOffset = endOffset; |
| this.pos = 0; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| if (pos < endOffset) { |
| pos++; |
| return 0; |
| } |
| return -1; |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return (int)(endOffset - pos); |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return pos; |
| } |
| |
| @Override |
| public void seek(long seekOffset) throws IOException { |
| if (seekOffset < endOffset) { |
| pos = seekOffset; |
| } else { |
| throw new IOException("Illegal Offset" + pos); |
| } |
| } |
| |
| @Override |
| public boolean seekToNewSource(long targetPos) throws IOException { |
| return false; |
| } |
| |
| @Override |
| public int read(long position, byte[] buffer, int offset, int length) |
| throws IOException { |
| int count = 0; |
| for (; position < endOffset && count < length; position++) { |
| buffer[offset + count] = 0; |
| count++; |
| } |
| return count; |
| } |
| |
| @Override |
| public void readFully(long position, byte[] buffer, int offset, int length) |
| throws IOException { |
| int count = 0; |
| for (; position < endOffset && count < length; position++) { |
| buffer[offset + count] = 0; |
| count++; |
| } |
| if (count < length) { |
| throw new IOException("Premature EOF"); |
| } |
| } |
| |
| @Override |
| public void readFully(long position, byte[] buffer) throws IOException { |
| readFully(position, buffer, 0, buffer.length); |
| } |
| } |
| } |