1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements.  See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership.  The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License.  You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
19 
20 import java.io.File;
21 import java.io.IOException;
22 import java.io.RandomAccessFile;
23 import java.nio.channels.FileChannel;
24 import java.nio.channels.FileLock;
25 import java.nio.channels.OverlappingFileLockException;
26 import java.util.Collection;
27 import java.util.Random;
28 
29 import org.apache.hadoop.hdfs.protocol.Block;
30 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
31 import org.apache.hadoop.hdfs.server.common.Storage;
32 import org.apache.hadoop.hdfs.server.datanode.DataNode;
33 import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
34 import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
35 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
36 import org.apache.hadoop.io.IOUtils;
37 
38 import static org.junit.Assert.assertNotNull;
39 import static org.junit.Assert.fail;
40 
41 public class FsDatasetTestUtil {
42 
getFile(FsDatasetSpi<?> fsd, String bpid, long bid)43   public static File getFile(FsDatasetSpi<?> fsd, String bpid, long bid) {
44     return ((FsDatasetImpl)fsd).getFile(bpid, bid, false);
45   }
46 
getBlockFile(FsDatasetSpi<?> fsd, String bpid, Block b )47   public static File getBlockFile(FsDatasetSpi<?> fsd, String bpid, Block b
48       ) throws IOException {
49     return ((FsDatasetImpl)fsd).getBlockFile(bpid, b.getBlockId());
50   }
51 
getMetaFile(FsDatasetSpi<?> fsd, String bpid, Block b)52   public static File getMetaFile(FsDatasetSpi<?> fsd, String bpid, Block b)
53       throws IOException {
54     return FsDatasetUtil.getMetaFile(getBlockFile(fsd, bpid, b), b
55         .getGenerationStamp());
56   }
57 
unlinkBlock(FsDatasetSpi<?> fsd, ExtendedBlock block, int numLinks)58   public static boolean unlinkBlock(FsDatasetSpi<?> fsd,
59       ExtendedBlock block, int numLinks) throws IOException {
60     final ReplicaInfo info = ((FsDatasetImpl)fsd).getReplicaInfo(block);
61     return info.unlinkBlock(numLinks);
62   }
63 
fetchReplicaInfo(final FsDatasetSpi<?> fsd, final String bpid, final long blockId)64   public static ReplicaInfo fetchReplicaInfo (final FsDatasetSpi<?> fsd,
65       final String bpid, final long blockId) {
66     return ((FsDatasetImpl)fsd).fetchReplicaInfo(bpid, blockId);
67   }
68 
getPendingAsyncDeletions(FsDatasetSpi<?> fsd)69   public static long getPendingAsyncDeletions(FsDatasetSpi<?> fsd) {
70     return ((FsDatasetImpl)fsd).asyncDiskService.countPendingDeletions();
71   }
72 
getReplicas(FsDatasetSpi<?> fsd, String bpid)73   public static Collection<ReplicaInfo> getReplicas(FsDatasetSpi<?> fsd,
74       String bpid) {
75     return ((FsDatasetImpl)fsd).volumeMap.replicas(bpid);
76   }
77 
78   /**
79    * Stop the lazy writer daemon that saves RAM disk files to persistent storage.
80    * @param dn
81    */
stopLazyWriter(DataNode dn)82   public static void stopLazyWriter(DataNode dn) {
83     FsDatasetImpl fsDataset = ((FsDatasetImpl) dn.getFSDataset());
84     ((FsDatasetImpl.LazyWriter) fsDataset.lazyWriter.getRunnable()).stop();
85   }
86 
87   /**
88    * Asserts that the storage lock file in the given directory has been
89    * released.  This method works by trying to acquire the lock file itself.  If
90    * locking fails here, then the main code must have failed to release it.
91    *
92    * @param dir the storage directory to check
93    * @throws IOException if there is an unexpected I/O error
94    */
assertFileLockReleased(String dir)95   public static void assertFileLockReleased(String dir) throws IOException {
96     StorageLocation sl = StorageLocation.parse(dir);
97     File lockFile = new File(sl.getFile(), Storage.STORAGE_FILE_LOCK);
98     try (RandomAccessFile raf = new RandomAccessFile(lockFile, "rws");
99         FileChannel channel = raf.getChannel()) {
100       FileLock lock = channel.tryLock();
101       assertNotNull(String.format(
102           "Lock file at %s appears to be held by a different process.",
103           lockFile.getAbsolutePath()), lock);
104       if (lock != null) {
105         try {
106           lock.release();
107         } catch (IOException e) {
108           FsDatasetImpl.LOG.warn(String.format("I/O error releasing file lock %s.",
109               lockFile.getAbsolutePath()), e);
110           throw e;
111         }
112       }
113     } catch (OverlappingFileLockException e) {
114       fail(String.format("Must release lock file at %s.",
115           lockFile.getAbsolutePath()));
116     }
117   }
118 }
119