| /** |
| * 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.snapshot; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.fail; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DistributedFileSystem; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.apache.hadoop.test.GenericTestUtils; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| public class TestSnapshotListing { |
| |
| static final long seed = 0; |
| static final short REPLICATION = 3; |
| static final long BLOCKSIZE = 1024; |
| |
| private final Path dir = new Path("/test.snapshot/dir"); |
| |
| Configuration conf; |
| MiniDFSCluster cluster; |
| FSNamesystem fsn; |
| DistributedFileSystem hdfs; |
| |
| @Before |
| public void setUp() throws Exception { |
| conf = new Configuration(); |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION) |
| .build(); |
| cluster.waitActive(); |
| fsn = cluster.getNamesystem(); |
| hdfs = cluster.getFileSystem(); |
| hdfs.mkdirs(dir); |
| } |
| |
| @After |
| public void tearDown() throws Exception { |
| if (cluster != null) { |
| cluster.shutdown(); |
| cluster = null; |
| } |
| } |
| |
| /** |
| * Test listing snapshots under a snapshottable directory |
| */ |
| @Test (timeout=15000) |
| public void testListSnapshots() throws Exception { |
| final Path snapshotsPath = new Path(dir, ".snapshot"); |
| FileStatus[] stats = null; |
| |
| // special case: snapshots of root |
| stats = hdfs.listStatus(new Path("/.snapshot")); |
| // should be 0 since root's snapshot quota is 0 |
| assertEquals(0, stats.length); |
| |
| // list before set dir as snapshottable |
| try { |
| stats = hdfs.listStatus(snapshotsPath); |
| fail("expect SnapshotException"); |
| } catch (IOException e) { |
| GenericTestUtils.assertExceptionContains( |
| "Directory is not a snapshottable directory: " + dir.toString(), e); |
| } |
| |
| // list before creating snapshots |
| hdfs.allowSnapshot(dir); |
| stats = hdfs.listStatus(snapshotsPath); |
| assertEquals(0, stats.length); |
| |
| // list while creating snapshots |
| final int snapshotNum = 5; |
| for (int sNum = 0; sNum < snapshotNum; sNum++) { |
| hdfs.createSnapshot(dir, "s_" + sNum); |
| stats = hdfs.listStatus(snapshotsPath); |
| assertEquals(sNum + 1, stats.length); |
| for (int i = 0; i <= sNum; i++) { |
| assertEquals("s_" + i, stats[i].getPath().getName()); |
| } |
| } |
| |
| // list while deleting snapshots |
| for (int sNum = snapshotNum - 1; sNum > 0; sNum--) { |
| hdfs.deleteSnapshot(dir, "s_" + sNum); |
| stats = hdfs.listStatus(snapshotsPath); |
| assertEquals(sNum, stats.length); |
| for (int i = 0; i < sNum; i++) { |
| assertEquals("s_" + i, stats[i].getPath().getName()); |
| } |
| } |
| |
| // remove the last snapshot |
| hdfs.deleteSnapshot(dir, "s_0"); |
| stats = hdfs.listStatus(snapshotsPath); |
| assertEquals(0, stats.length); |
| } |
| } |