org.apache.hadoop.hdfs.server.blockmanagement.ReplicaUnderConstruction Maven / Gradle / Ivy
/**
* 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.server.blockmanagement;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
/**
* ReplicaUnderConstruction contains information about replicas (or blocks
* belonging to a block group) while they are under construction.
*
* The GS, the length and the state of the replica is as reported by the
* datanode.
*
* It is not guaranteed, but expected, that datanodes actually have
* corresponding replicas.
*/
class ReplicaUnderConstruction extends Block {
private final DatanodeStorageInfo expectedLocation;
private HdfsServerConstants.ReplicaState state;
private boolean chosenAsPrimary;
ReplicaUnderConstruction(Block block,
DatanodeStorageInfo target,
HdfsServerConstants.ReplicaState state) {
super(block);
this.expectedLocation = target;
this.state = state;
this.chosenAsPrimary = false;
}
/**
* Expected block replica location as assigned when the block was allocated.
* This defines the pipeline order.
* It is not guaranteed, but expected, that the data-node actually has
* the replica.
*/
DatanodeStorageInfo getExpectedStorageLocation() {
return expectedLocation;
}
/**
* Get replica state as reported by the data-node.
*/
HdfsServerConstants.ReplicaState getState() {
return state;
}
/**
* Whether the replica was chosen for recovery.
*/
boolean getChosenAsPrimary() {
return chosenAsPrimary;
}
/**
* Set replica state.
*/
void setState(HdfsServerConstants.ReplicaState s) {
state = s;
}
/**
* Set whether this replica was chosen for recovery.
*/
void setChosenAsPrimary(boolean chosenAsPrimary) {
this.chosenAsPrimary = chosenAsPrimary;
}
/**
* Is data-node the replica belongs to alive.
*/
boolean isAlive() {
return expectedLocation.getDatanodeDescriptor().isAlive();
}
@Override // Block
public int hashCode() {
return super.hashCode();
}
@Override // Block
public boolean equals(Object obj) {
// Sufficient to rely on super's implementation
return (this == obj) || super.equals(obj);
}
@Override
public String toString() {
final StringBuilder b = new StringBuilder(50);
appendStringTo(b);
return b.toString();
}
@Override
public void appendStringTo(StringBuilder sb) {
sb.append("ReplicaUC[")
.append(expectedLocation)
.append("|")
.append(state)
.append("]");
}
}