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Merge pull request #10755 from rmuir/filestores
refactor SSD/FileStore logic out of NodeEnvironment
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| @@ -0,0 +1,172 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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. | ||
| */ | ||
|
|
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| package org.elasticsearch.env; | ||
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| import org.apache.lucene.util.Constants; | ||
| import org.apache.lucene.util.IOUtils; | ||
| import org.elasticsearch.common.io.PathUtils; | ||
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| import java.io.IOException; | ||
| import java.nio.file.FileStore; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.attribute.FileAttributeView; | ||
| import java.nio.file.attribute.FileStoreAttributeView; | ||
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|
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| /** | ||
| * Implementation of FileStore that supports | ||
| * additional features, such as SSD detection and better | ||
| * filesystem information for the root filesystem. | ||
| * @see Environment#getFileStore(Path) | ||
| */ | ||
| class ESFileStore extends FileStore { | ||
| /** Underlying filestore */ | ||
| final FileStore in; | ||
| /** Cached result of Lucene's {@code IOUtils.spins} on path. */ | ||
| final Boolean spins; | ||
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| ESFileStore(FileStore in) { | ||
| this.in = in; | ||
| Boolean spins; | ||
| // Lucene's IOUtils.spins only works on Linux today: | ||
| if (Constants.LINUX) { | ||
| try { | ||
| spins = IOUtils.spins(PathUtils.get(getMountPointLinux(in))); | ||
| } catch (Exception e) { | ||
| spins = null; | ||
| } | ||
| } else { | ||
| spins = null; | ||
| } | ||
| this.spins = spins; | ||
| } | ||
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| // these are hacks that are not guaranteed | ||
| private static String getMountPointLinux(FileStore store) { | ||
| String desc = store.toString(); | ||
| int index = desc.lastIndexOf(" ("); | ||
| if (index != -1) { | ||
| return desc.substring(0, index); | ||
| } else { | ||
| return desc; | ||
| } | ||
| } | ||
|
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| /** Files.getFileStore(Path) useless here! Don't complain, just try it yourself. */ | ||
| static FileStore getMatchingFileStore(Path path, FileStore fileStores[]) throws IOException { | ||
| FileStore store = Files.getFileStore(path); | ||
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| if (Constants.WINDOWS) { | ||
| return store; // be defensive, don't even try to do anything fancy. | ||
| } | ||
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| try { | ||
| String mount = getMountPointLinux(store); | ||
| FileStore sameMountPoint = null; | ||
| for (FileStore fs : fileStores) { | ||
| if (mount.equals(getMountPointLinux(fs))) { | ||
| if (sameMountPoint == null) { | ||
| sameMountPoint = fs; | ||
| } else { | ||
| // more than one filesystem has the same mount point; something is wrong! | ||
| // fall back to crappy one we got from Files.getFileStore | ||
| return store; | ||
| } | ||
| } | ||
| } | ||
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| if (sameMountPoint != null) { | ||
| // ok, we found only one, use it: | ||
| return sameMountPoint; | ||
| } else { | ||
| // fall back to crappy one we got from Files.getFileStore | ||
| return store; | ||
| } | ||
| } catch (Exception e) { | ||
| // ignore | ||
| } | ||
|
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| // fall back to crappy one we got from Files.getFileStore | ||
| return store; | ||
| } | ||
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| @Override | ||
| public String name() { | ||
| return in.name(); | ||
| } | ||
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| @Override | ||
| public String type() { | ||
| return in.type(); | ||
| } | ||
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| @Override | ||
| public boolean isReadOnly() { | ||
| return in.isReadOnly(); | ||
| } | ||
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| @Override | ||
| public long getTotalSpace() throws IOException { | ||
| return in.getTotalSpace(); | ||
| } | ||
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| @Override | ||
| public long getUsableSpace() throws IOException { | ||
| return in.getUsableSpace(); | ||
| } | ||
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| @Override | ||
| public long getUnallocatedSpace() throws IOException { | ||
| return in.getUnallocatedSpace(); | ||
| } | ||
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| @Override | ||
| public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { | ||
| return in.supportsFileAttributeView(type); | ||
| } | ||
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| @Override | ||
| public boolean supportsFileAttributeView(String name) { | ||
| if ("lucene".equals(name)) { | ||
| return true; | ||
| } else { | ||
| return in.supportsFileAttributeView(name); | ||
| } | ||
| } | ||
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| @Override | ||
| public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type) { | ||
| return in.getFileStoreAttributeView(type); | ||
| } | ||
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| @Override | ||
| public Object getAttribute(String attribute) throws IOException { | ||
| if ("lucene:spins".equals(attribute)) { | ||
| return spins; | ||
| } else { | ||
| return in.getAttribute(attribute); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public String toString() { | ||
| return in.toString(); | ||
| } | ||
| } |
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