| /** |
| * 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.yarn.nodelabels; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.yarn.api.records.NodeId; |
| import org.apache.hadoop.yarn.api.records.NodeLabel; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| import org.apache.hadoop.yarn.nodelabels.store.FSStoreOpHandler; |
| import org.apache.hadoop.yarn.nodelabels.store.StoreOp; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| /** |
| * Store implementation for Non Appendable File Store. |
| */ |
| public class NonAppendableFSNodeLabelStore extends FileSystemNodeLabelsStore { |
| protected static final Log |
| LOG = LogFactory.getLog(NonAppendableFSNodeLabelStore.class); |
| |
| @Override |
| public void close() throws IOException { |
| } |
| |
| |
| @Override |
| public void recover() throws YarnException, |
| IOException { |
| Path newMirrorPath = new Path(fsWorkingPath, MIRROR_FILENAME + ".new"); |
| Path oldMirrorPath = new Path(fsWorkingPath, MIRROR_FILENAME); |
| loadFromMirror(newMirrorPath, oldMirrorPath); |
| |
| // if new mirror exists, remove old mirror and rename new mirror |
| if (fs.exists(newMirrorPath)) { |
| // remove old mirror |
| try { |
| fs.delete(oldMirrorPath, false); |
| } catch (IOException e) { |
| // do nothing |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Exception while removing old mirror", e); |
| } |
| } |
| |
| // rename new to old |
| fs.rename(newMirrorPath, oldMirrorPath); |
| } |
| |
| LOG.info("Node label store recover is completed"); |
| } |
| |
| @Override |
| public void updateNodeToLabelsMappings( |
| Map<NodeId, Set<String>> nodeToLabels) throws IOException { |
| writeNewMirror(); |
| } |
| |
| @Override |
| public void storeNewClusterNodeLabels(List<NodeLabel> labels) |
| throws IOException { |
| writeNewMirror(); |
| } |
| |
| @Override |
| public void removeClusterNodeLabels(Collection<String> labels) |
| throws IOException { |
| writeNewMirror(); |
| } |
| |
| private void writeNewMirror() throws IOException { |
| ReentrantReadWriteLock.ReadLock readLock = manager.readLock; |
| try { |
| // Acquire readlock to make sure we get cluster node labels and |
| // node-to-labels mapping atomically. |
| readLock.lock(); |
| // Write mirror to mirror.new.tmp file |
| Path newTmpPath = new Path(fsWorkingPath, MIRROR_FILENAME + ".new.tmp"); |
| try (FSDataOutputStream os = fs.create(newTmpPath, true)) { |
| StoreOp op = FSStoreOpHandler.getMirrorOp(getStoreType()); |
| op.write(os, manager); |
| } |
| |
| // Rename mirror.new.tmp to mirror.new (will remove .new if it's existed) |
| Path newPath = new Path(fsWorkingPath, MIRROR_FILENAME + ".new"); |
| fs.delete(newPath, false); |
| fs.rename(newTmpPath, newPath); |
| |
| // Remove existing mirror and rename mirror.new to mirror |
| Path mirrorPath = new Path(fsWorkingPath, MIRROR_FILENAME); |
| fs.delete(mirrorPath, false); |
| fs.rename(newPath, mirrorPath); |
| } finally { |
| readLock.unlock(); |
| } |
| } |
| } |