| /** |
| * 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.fs; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableFactories; |
| import org.apache.hadoop.io.WritableFactory; |
| |
| /* |
| * A BlockLocation lists hosts, offset and length |
| * of block. |
| * |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class BlockLocation implements Writable { |
| |
| static { // register a ctor |
| WritableFactories.setFactory |
| (BlockLocation.class, |
| new WritableFactory() { |
| public Writable newInstance() { return new BlockLocation(); } |
| }); |
| } |
| |
| private String[] hosts; //hostnames of datanodes |
| private String[] names; //hostname:portNumber of datanodes |
| private String[] topologyPaths; // full path name in network topology |
| private long offset; //offset of the of the block in the file |
| private long length; |
| private boolean corrupt; |
| |
| /** |
| * Default Constructor |
| */ |
| public BlockLocation() { |
| this(new String[0], new String[0], 0L, 0L); |
| } |
| |
| /** |
| * Constructor with host, name, offset and length |
| */ |
| public BlockLocation(String[] names, String[] hosts, long offset, |
| long length) { |
| this(names, hosts, offset, length, false); |
| } |
| |
| /** |
| * Constructor with host, name, offset, length and corrupt flag |
| */ |
| public BlockLocation(String[] names, String[] hosts, long offset, |
| long length, boolean corrupt) { |
| if (names == null) { |
| this.names = new String[0]; |
| } else { |
| this.names = names; |
| } |
| if (hosts == null) { |
| this.hosts = new String[0]; |
| } else { |
| this.hosts = hosts; |
| } |
| this.offset = offset; |
| this.length = length; |
| this.topologyPaths = new String[0]; |
| this.corrupt = corrupt; |
| } |
| |
| /** |
| * Constructor with host, name, network topology, offset and length |
| */ |
| public BlockLocation(String[] names, String[] hosts, String[] topologyPaths, |
| long offset, long length) { |
| this(names, hosts, topologyPaths, offset, length, false); |
| } |
| |
| /** |
| * Constructor with host, name, network topology, offset, length |
| * and corrupt flag |
| */ |
| public BlockLocation(String[] names, String[] hosts, String[] topologyPaths, |
| long offset, long length, boolean corrupt) { |
| this(names, hosts, offset, length, corrupt); |
| if (topologyPaths == null) { |
| this.topologyPaths = new String[0]; |
| } else { |
| this.topologyPaths = topologyPaths; |
| } |
| } |
| |
| /** |
| * Get the list of hosts (hostname) hosting this block |
| */ |
| public String[] getHosts() throws IOException { |
| if ((hosts == null) || (hosts.length == 0)) { |
| return new String[0]; |
| } else { |
| return hosts; |
| } |
| } |
| |
| /** |
| * Get the list of names (hostname:port) hosting this block |
| */ |
| public String[] getNames() throws IOException { |
| if ((names == null) || (names.length == 0)) { |
| return new String[0]; |
| } else { |
| return this.names; |
| } |
| } |
| |
| /** |
| * Get the list of network topology paths for each of the hosts. |
| * The last component of the path is the host. |
| */ |
| public String[] getTopologyPaths() throws IOException { |
| if ((topologyPaths == null) || (topologyPaths.length == 0)) { |
| return new String[0]; |
| } else { |
| return this.topologyPaths; |
| } |
| } |
| |
| /** |
| * Get the start offset of file associated with this block |
| */ |
| public long getOffset() { |
| return offset; |
| } |
| |
| /** |
| * Get the length of the block |
| */ |
| public long getLength() { |
| return length; |
| } |
| |
| /** |
| * Get the corrupt flag. |
| */ |
| public boolean isCorrupt() { |
| return corrupt; |
| } |
| |
| /** |
| * Set the start offset of file associated with this block |
| */ |
| public void setOffset(long offset) { |
| this.offset = offset; |
| } |
| |
| /** |
| * Set the length of block |
| */ |
| public void setLength(long length) { |
| this.length = length; |
| } |
| |
| /** |
| * Set the corrupt flag. |
| */ |
| public void setCorrupt(boolean corrupt) { |
| this.corrupt = corrupt; |
| } |
| |
| /** |
| * Set the hosts hosting this block |
| */ |
| public void setHosts(String[] hosts) throws IOException { |
| if (hosts == null) { |
| this.hosts = new String[0]; |
| } else { |
| this.hosts = hosts; |
| } |
| } |
| |
| /** |
| * Set the names (host:port) hosting this block |
| */ |
| public void setNames(String[] names) throws IOException { |
| if (names == null) { |
| this.names = new String[0]; |
| } else { |
| this.names = names; |
| } |
| } |
| |
| /** |
| * Set the network topology paths of the hosts |
| */ |
| public void setTopologyPaths(String[] topologyPaths) throws IOException { |
| if (topologyPaths == null) { |
| this.topologyPaths = new String[0]; |
| } else { |
| this.topologyPaths = topologyPaths; |
| } |
| } |
| |
| /** |
| * Implement write of Writable |
| */ |
| public void write(DataOutput out) throws IOException { |
| out.writeLong(offset); |
| out.writeLong(length); |
| out.writeBoolean(corrupt); |
| out.writeInt(names.length); |
| for (int i=0; i < names.length; i++) { |
| Text name = new Text(names[i]); |
| name.write(out); |
| } |
| out.writeInt(hosts.length); |
| for (int i=0; i < hosts.length; i++) { |
| Text host = new Text(hosts[i]); |
| host.write(out); |
| } |
| out.writeInt(topologyPaths.length); |
| for (int i=0; i < topologyPaths.length; i++) { |
| Text host = new Text(topologyPaths[i]); |
| host.write(out); |
| } |
| } |
| |
| /** |
| * Implement readFields of Writable |
| */ |
| public void readFields(DataInput in) throws IOException { |
| this.offset = in.readLong(); |
| this.length = in.readLong(); |
| this.corrupt = in.readBoolean(); |
| int numNames = in.readInt(); |
| this.names = new String[numNames]; |
| for (int i = 0; i < numNames; i++) { |
| Text name = new Text(); |
| name.readFields(in); |
| names[i] = name.toString(); |
| } |
| |
| int numHosts = in.readInt(); |
| this.hosts = new String[numHosts]; |
| for (int i = 0; i < numHosts; i++) { |
| Text host = new Text(); |
| host.readFields(in); |
| hosts[i] = host.toString(); |
| } |
| |
| int numTops = in.readInt(); |
| topologyPaths = new String[numTops]; |
| for (int i = 0; i < numTops; i++) { |
| Text path = new Text(); |
| path.readFields(in); |
| topologyPaths[i] = path.toString(); |
| } |
| } |
| |
| public String toString() { |
| StringBuilder result = new StringBuilder(); |
| result.append(offset); |
| result.append(','); |
| result.append(length); |
| if (corrupt) { |
| result.append("(corrupt)"); |
| } |
| for(String h: hosts) { |
| result.append(','); |
| result.append(h); |
| } |
| return result.toString(); |
| } |
| } |