/**
* 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.namenode;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
/**
* Feature for under-construction file.
*/
@InterfaceAudience.Private
public class FileUnderConstructionFeature implements INode.Feature {
private String clientName; // lease holder
private final String clientMachine;
public FileUnderConstructionFeature(final String clientName, final String clientMachine) {
this.clientName = clientName;
this.clientMachine = clientMachine;
}
public String getClientName() {
return clientName;
}
void setClientName(String clientName) {
this.clientName = clientName;
}
public String getClientMachine() {
return clientMachine;
}
/**
* Update the length for the last block
*
* @param lastBlockLength
* The length of the last block reported from client
* @throws IOException
*/
void updateLengthOfLastBlock(INodeFile f, long lastBlockLength)
throws IOException {
BlockInfo lastBlock = f.getLastBlock();
assert (lastBlock != null) : "The last block for path "
+ f.getFullPathName() + " is null when updating its length";
assert (lastBlock instanceof BlockInfoUnderConstruction)
: "The last block for path " + f.getFullPathName()
+ " is not a BlockInfoUnderConstruction when updating its length";
lastBlock.setNumBytes(lastBlockLength);
}
/**
* When deleting a file in the current fs directory, and the file is contained
* in a snapshot, we should delete the last block if it's under construction
* and its size is 0.
*/
void cleanZeroSizeBlock(final INodeFile f,
final BlocksMapUpdateInfo collectedBlocks) {
final BlockInfo[] blocks = f.getBlocks();
if (blocks != null && blocks.length > 0
&& blocks[blocks.length - 1] instanceof BlockInfoUnderConstruction) {
BlockInfoUnderConstruction lastUC =
(BlockInfoUnderConstruction) blocks[blocks.length - 1];
if (lastUC.getNumBytes() == 0) {
// this is a 0-sized block. do not need check its UC state here
collectedBlocks.addDeleteBlock(lastUC);
f.removeLastBlock(lastUC);
}
}
}
}