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HDFS-7839. Erasure coding: implement facilities in NameNode to create…
… and manage EC zones. Contributed by Zhe Zhang
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...p-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ErasureCodingZoneManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /** | ||
| * 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 com.google.common.base.Preconditions; | ||
| import com.google.common.collect.Lists; | ||
| import org.apache.hadoop.fs.XAttr; | ||
| import org.apache.hadoop.fs.XAttrSetFlag; | ||
| import org.apache.hadoop.hdfs.XAttrHelper; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.EnumSet; | ||
| import java.util.List; | ||
|
|
||
| import static org.apache.hadoop.hdfs.server.common.HdfsServerConstants.XATTR_ERASURECODING_ZONE; | ||
|
|
||
| /** | ||
| * Manages the list of erasure coding zones in the filesystem. | ||
| * <p/> | ||
| * The ErasureCodingZoneManager has its own lock, but relies on the FSDirectory | ||
| * lock being held for many operations. The FSDirectory lock should not be | ||
| * taken if the manager lock is already held. | ||
| * TODO: consolidate zone logic w/ encrypt. zones {@link EncryptionZoneManager} | ||
| */ | ||
| public class ErasureCodingZoneManager { | ||
| private final FSDirectory dir; | ||
|
|
||
| /** | ||
| * Construct a new ErasureCodingZoneManager. | ||
| * | ||
| * @param dir Enclosing FSDirectory | ||
| */ | ||
| public ErasureCodingZoneManager(FSDirectory dir) { | ||
| this.dir = dir; | ||
| } | ||
|
|
||
| boolean getECPolicy(INodesInPath iip) { | ||
| assert dir.hasReadLock(); | ||
| Preconditions.checkNotNull(iip); | ||
| List<INode> inodes = iip.getReadOnlyINodes(); | ||
| for (int i = inodes.size() - 1; i >= 0; i--) { | ||
| final INode inode = inodes.get(i); | ||
| if (inode == null) { | ||
| continue; | ||
| } | ||
| final List<XAttr> xAttrs = inode.getXAttrFeature() == null ? | ||
| new ArrayList<XAttr>(0) | ||
| : inode.getXAttrFeature().getXAttrs(); | ||
| for (XAttr xAttr : xAttrs) { | ||
| if (XATTR_ERASURECODING_ZONE.equals(XAttrHelper.getPrefixName(xAttr))) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| XAttr createErasureCodingZone(String src) | ||
| throws IOException { | ||
| assert dir.hasWriteLock(); | ||
| final INodesInPath srcIIP = dir.getINodesInPath4Write(src, false); | ||
| if (dir.isNonEmptyDirectory(srcIIP)) { | ||
| throw new IOException( | ||
| "Attempt to create an erasure coding zone for a " + | ||
| "non-empty directory."); | ||
| } | ||
| if (srcIIP != null && | ||
| srcIIP.getLastINode() != null && | ||
| !srcIIP.getLastINode().isDirectory()) { | ||
| throw new IOException("Attempt to create an erasure coding zone " + | ||
| "for a file."); | ||
| } | ||
| if (getECPolicy(srcIIP)) { | ||
| throw new IOException("Directory " + src + " is already in an " + | ||
| "erasure coding zone."); | ||
| } | ||
| final XAttr ecXAttr = XAttrHelper | ||
| .buildXAttr(XATTR_ERASURECODING_ZONE, null); | ||
| final List<XAttr> xattrs = Lists.newArrayListWithCapacity(1); | ||
| xattrs.add(ecXAttr); | ||
| FSDirXAttrOp.unprotectedSetXAttrs(dir, src, xattrs, | ||
| EnumSet.of(XAttrSetFlag.CREATE)); | ||
| return ecXAttr; | ||
| } | ||
|
|
||
| void checkMoveValidity(INodesInPath srcIIP, INodesInPath dstIIP, String src) | ||
| throws IOException { | ||
| assert dir.hasReadLock(); | ||
| if (getECPolicy(srcIIP) | ||
| != getECPolicy(dstIIP)) { | ||
| throw new IOException( | ||
| src + " can't be moved because the source and destination have " + | ||
| "different erasure coding policies."); | ||
| } | ||
| } | ||
| } |
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