HDFS-5000. DataNode configuration should allow specifying storage type (Adding file missed in last commit
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2832@1517499 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.datanode;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.hdfs.StorageType;
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import org.apache.hadoop.hdfs.server.common.Util;
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import java.io.File;
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import java.io.IOException;
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import java.net.URI;
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import java.util.regex.Matcher;
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import static java.util.regex.Pattern.compile;
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/**
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* Encapsulates the URI and storage medium that together describe a
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* storage directory.
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* The default storage medium is assumed to be DISK, if none is specified.
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*
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*/
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@InterfaceAudience.Private
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public class StorageLocation {
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public static final Log LOG = LogFactory.getLog(StorageLocation.class);
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final StorageType storageType;
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final File file;
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// Regular expression that describes a storage uri with a storage type.
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// e.g. [Disk]/storages/storage1/
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private static final String rawStringRegex = "^\\[(\\w*)\\](.+)$";
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StorageLocation(URI uri) {
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this(StorageType.DISK, uri);
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}
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StorageLocation(StorageType storageType, URI uri) {
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this.storageType = storageType;
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if (uri.getScheme() == null ||
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"file".equalsIgnoreCase(uri.getScheme())) {
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// drop any (illegal) authority in the URI for backwards compatibility
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this.file = new File(uri.getPath());
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} else {
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throw new IllegalArgumentException(
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"Got an Unsupported URI schema in " + uri + ". Ignoring ...");
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}
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}
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public StorageType getStorageType() {
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return this.storageType;
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}
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public URI getUri() {
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return file.toURI();
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}
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public File getFile() {
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return this.file;
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}
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/**
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* Attempt to parse a storage uri with storage class and URI. The storage
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* class component of the uri is case-insensitive.
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*
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* @param rawLocation Location string of the format [type]uri, where [type] is
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* optional.
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* @return A StorageLocation object if successfully parsed, null otherwise.
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* Does not throw any exceptions.
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*/
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public static StorageLocation parse(String rawLocation) throws IOException {
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Matcher matcher = compile(rawStringRegex).matcher(rawLocation);
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StorageType storageType = StorageType.DISK;
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String location = rawLocation;
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if (matcher.matches()) {
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String classString = matcher.group(1);
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location = matcher.group(2);
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if (!classString.isEmpty()) {
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try {
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storageType = StorageType.valueOf(classString.toUpperCase());
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} catch (RuntimeException re) {
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LOG.error("Unable to parse storage type: " + re.toString() +
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". Using the default storage type for directory " +
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location);
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}
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}
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}
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return new StorageLocation(storageType, Util.stringAsURI(location));
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}
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public String toString() {
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return "[" + storageType.toString() + "]" + file.toURI().toString();
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}
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}
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