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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.hadoop.fs;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Represents the network location of a block, information about the hosts
* that contain block replicas, and other block metadata (E.g. the file
* offset associated with the block, length, whether it is corrupt, etc).
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class BlockLocation {
private String[] hosts; // Datanode hostnames
private String[] cachedHosts; // Datanode hostnames with a cached replica
private String[] names; // Datanode IP:xferPort for accessing the block
private String[] topologyPaths; // Full path name in network topology
private long offset; // Offset of the block in the file
private long length;
private boolean corrupt;
private static final String[] EMPTY_STR_ARRAY = new String[0];
/**
* Default Constructor
*/
public BlockLocation() {
this(EMPTY_STR_ARRAY, EMPTY_STR_ARRAY, 0L, 0L);
}
/**
* Copy constructor
*/
public BlockLocation(BlockLocation that) {
this.hosts = that.hosts;
this.cachedHosts = that.cachedHosts;
this.names = that.names;
this.topologyPaths = that.topologyPaths;
this.offset = that.offset;
this.length = that.length;
this.corrupt = that.corrupt;
}
/**
* 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) {
this(names, hosts, null, offset, length, 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, null, topologyPaths, offset, length, corrupt);
}
public BlockLocation(String[] names, String[] hosts, String[] cachedHosts,
String[] topologyPaths, long offset, long length, boolean corrupt) {
if (names == null) {
this.names = EMPTY_STR_ARRAY;
} else {
this.names = names;
}
if (hosts == null) {
this.hosts = EMPTY_STR_ARRAY;
} else {
this.hosts = hosts;
}
if (cachedHosts == null) {
this.cachedHosts = EMPTY_STR_ARRAY;
} else {
this.cachedHosts = cachedHosts;
}
if (topologyPaths == null) {
this.topologyPaths = EMPTY_STR_ARRAY;
} else {
this.topologyPaths = topologyPaths;
}
this.offset = offset;
this.length = length;
this.corrupt = corrupt;
}
/**
* Get the list of hosts (hostname) hosting this block
*/
public String[] getHosts() throws IOException {
return hosts;
}
/**
* Get the list of hosts (hostname) hosting a cached replica of the block
*/
public String[] getCachedHosts() {
return cachedHosts;
}
/**
* Get the list of names (IP:xferPort) hosting this block
*/
public String[] getNames() throws IOException {
return names;
}
/**
* Get the list of network topology paths for each of the hosts.
* The last component of the path is the "name" (IP:xferPort).
*/
public String[] getTopologyPaths() throws IOException {
return 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 = EMPTY_STR_ARRAY;
} else {
this.hosts = hosts;
}
}
/**
* Set the hosts hosting a cached replica of this block
*/
public void setCachedHosts(String[] cachedHosts) {
if (cachedHosts == null) {
this.cachedHosts = EMPTY_STR_ARRAY;
} else {
this.cachedHosts = cachedHosts;
}
}
/**
* Set the names (host:port) hosting this block
*/
public void setNames(String[] names) throws IOException {
if (names == null) {
this.names = EMPTY_STR_ARRAY;
} else {
this.names = names;
}
}
/**
* Set the network topology paths of the hosts
*/
public void setTopologyPaths(String[] topologyPaths) throws IOException {
if (topologyPaths == null) {
this.topologyPaths = EMPTY_STR_ARRAY;
} else {
this.topologyPaths = topologyPaths;
}
}
@Override
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();
}
}
