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LocatedBlock.java
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LocatedBlock.java
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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.hdfs.protocol;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.StorageType;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
import org.apache.hadoop.hdfs.protocol.DatanodeInfoWithStorage;
import org.apache.hadoop.security.token.Token;
import com.google.common.collect.Lists;
/**
* Associates a block with the Datanodes that contain its replicas
* and other block metadata (E.g. the file offset associated with this
* block, whether it is corrupt, a location is cached in memory,
* security token, etc).
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class LocatedBlock {
private final ExtendedBlock b;
private long offset; // offset of the first byte of the block in the file
private final DatanodeInfoWithStorage[] locs;
private final boolean hasStorageIDs;
private final boolean hasStorageTypes;
/** Cached storage ID for each replica */
private String[] storageIDs;
/** Cached storage type for each replica, if reported. */
private StorageType[] storageTypes;
// corrupt flag is true if all of the replicas of a block are corrupt.
// else false. If block has few corrupt replicas, they are filtered and
// their locations are not part of this object
private boolean corrupt;
private Token<BlockTokenIdentifier> blockToken = new Token<BlockTokenIdentifier>();
/**
* List of cached datanode locations
*/
private DatanodeInfo[] cachedLocs;
// Used when there are no locations
private static final DatanodeInfoWithStorage[] EMPTY_LOCS =
new DatanodeInfoWithStorage[0];
public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs) {
this(b, locs, -1, false); // startOffset is unknown
}
public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs, long startOffset,
boolean corrupt) {
this(b, locs, null, null, startOffset, corrupt, EMPTY_LOCS);
}
public LocatedBlock(ExtendedBlock b, DatanodeStorageInfo[] storages) {
this(b, storages, -1, false); // startOffset is unknown
}
public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs,
String[] storageIDs, StorageType[] storageTypes) {
this(b, locs, storageIDs, storageTypes, -1, false, EMPTY_LOCS);
}
public LocatedBlock(ExtendedBlock b, DatanodeStorageInfo[] storages,
long startOffset, boolean corrupt) {
this(b, DatanodeStorageInfo.toDatanodeInfos(storages),
DatanodeStorageInfo.toStorageIDs(storages),
DatanodeStorageInfo.toStorageTypes(storages),
startOffset, corrupt, EMPTY_LOCS); // startOffset is unknown
}
public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs, String[] storageIDs,
StorageType[] storageTypes, long startOffset,
boolean corrupt, DatanodeInfo[] cachedLocs) {
this.b = b;
this.offset = startOffset;
this.corrupt = corrupt;
if (locs==null) {
this.locs = EMPTY_LOCS;
} else {
this.locs = new DatanodeInfoWithStorage[locs.length];
for(int i = 0; i < locs.length; i++) {
DatanodeInfo di = locs[i];
DatanodeInfoWithStorage storage = new DatanodeInfoWithStorage(di,
storageIDs != null ? storageIDs[i] : null,
storageTypes != null ? storageTypes[i] : null);
storage.setDependentHostNames(di.getDependentHostNames());
storage.setLevel(di.getLevel());
storage.setParent(di.getParent());
this.locs[i] = storage;
}
}
this.storageIDs = storageIDs;
this.storageTypes = storageTypes;
this.hasStorageIDs = storageIDs != null;
this.hasStorageTypes = storageTypes != null;
if (cachedLocs == null || cachedLocs.length == 0) {
this.cachedLocs = EMPTY_LOCS;
} else {
this.cachedLocs = cachedLocs;
}
}
public Token<BlockTokenIdentifier> getBlockToken() {
return blockToken;
}
public void setBlockToken(Token<BlockTokenIdentifier> token) {
this.blockToken = token;
}
public ExtendedBlock getBlock() {
return b;
}
/**
* Returns the locations associated with this block. The returned array is not
* expected to be modified. If it is, caller must immediately invoke
* {@link org.apache.hadoop.hdfs.protocol.LocatedBlock#invalidateCachedStorageInfo}
* to invalidate the cached Storage ID/Type arrays.
*/
public DatanodeInfo[] getLocations() {
return locs;
}
public StorageType[] getStorageTypes() {
if(!hasStorageTypes) {
return null;
}
if(storageTypes != null) {
return storageTypes;
}
storageTypes = new StorageType[locs.length];
for(int i = 0; i < locs.length; i++) {
storageTypes[i] = locs[i].getStorageType();
}
return storageTypes;
}
public String[] getStorageIDs() {
if(!hasStorageIDs) {
return null;
}
if(storageIDs != null) {
return storageIDs;
}
storageIDs = new String[locs.length];
for(int i = 0; i < locs.length; i++) {
storageIDs[i] = locs[i].getStorageID();
}
return storageIDs;
}
/**
* Invalidates the cached StorageID and StorageType information. Must be
* called when the locations array is modified.
*/
public void invalidateCachedStorageInfo() {
storageIDs = null;
storageTypes = null;
}
public long getStartOffset() {
return offset;
}
public long getBlockSize() {
return b.getNumBytes();
}
void setStartOffset(long value) {
this.offset = value;
}
void setCorrupt(boolean corrupt) {
this.corrupt = corrupt;
}
public boolean isCorrupt() {
return this.corrupt;
}
/**
* Add a the location of a cached replica of the block.
*
* @param loc of datanode with the cached replica
*/
public void addCachedLoc(DatanodeInfo loc) {
List<DatanodeInfo> cachedList = Lists.newArrayList(cachedLocs);
if (cachedList.contains(loc)) {
return;
}
// Try to re-use a DatanodeInfo already in loc
for (DatanodeInfoWithStorage di : locs) {
if (loc.equals(di)) {
cachedList.add(di);
cachedLocs = cachedList.toArray(cachedLocs);
return;
}
}
// Not present in loc, add it and go
cachedList.add(loc);
cachedLocs = cachedList.toArray(cachedLocs);
}
/**
* @return Datanodes with a cached block replica
*/
public DatanodeInfo[] getCachedLocations() {
return cachedLocs;
}
@Override
public String toString() {
return getClass().getSimpleName() + "{" + b
+ "; getBlockSize()=" + getBlockSize()
+ "; corrupt=" + corrupt
+ "; offset=" + offset
+ "; locs=" + Arrays.asList(locs)
+ "}";
}
}