Add the new test file by HDFS-4520.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1449863 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.namenode.snapshot;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.fail;
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import java.io.IOException;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.hdfs.DistributedFileSystem;
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import org.apache.hadoop.hdfs.MiniDFSCluster;
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import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
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import org.apache.hadoop.test.GenericTestUtils;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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public class TestSnapshotListing {
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static final long seed = 0;
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static final short REPLICATION = 3;
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static final long BLOCKSIZE = 1024;
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private final Path dir = new Path("/test.snapshot/dir");
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Configuration conf;
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MiniDFSCluster cluster;
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FSNamesystem fsn;
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DistributedFileSystem hdfs;
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@Before
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public void setUp() throws Exception {
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conf = new Configuration();
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cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION)
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.build();
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cluster.waitActive();
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fsn = cluster.getNamesystem();
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hdfs = cluster.getFileSystem();
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hdfs.mkdirs(dir);
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}
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@After
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public void tearDown() throws Exception {
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if (cluster != null) {
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cluster.shutdown();
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}
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}
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/**
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* Test listing snapshots under a snapshottable directory
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*/
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@Test
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public void testListSnapshots() throws Exception {
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final Path snapshotsPath = new Path(dir, ".snapshot");
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FileStatus[] stats = null;
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// special case: snapshots of root
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stats = hdfs.listStatus(new Path("/.snapshot"));
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// should be 0 since root's snapshot quota is 0
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assertEquals(0, stats.length);
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// list before set dir as snapshottable
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try {
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stats = hdfs.listStatus(snapshotsPath);
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fail("expect SnapshotException");
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} catch (IOException e) {
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GenericTestUtils.assertExceptionContains(
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"Directory is not a snapshottable directory: " + dir.toString(), e);
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}
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// list before creating snapshots
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hdfs.allowSnapshot(dir.toString());
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stats = hdfs.listStatus(snapshotsPath);
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assertEquals(0, stats.length);
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// list while creating snapshots
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final int snapshotNum = 5;
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for (int sNum = 0; sNum < snapshotNum; sNum++) {
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hdfs.createSnapshot(dir, "s_" + sNum);
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stats = hdfs.listStatus(snapshotsPath);
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assertEquals(sNum + 1, stats.length);
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for (int i = 0; i <= sNum; i++) {
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assertEquals("s_" + i, stats[i].getPath().getName());
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}
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}
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// list while deleting snapshots
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for (int sNum = snapshotNum - 1; sNum > 0; sNum--) {
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hdfs.deleteSnapshot(dir, "s_" + sNum);
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stats = hdfs.listStatus(snapshotsPath);
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assertEquals(sNum, stats.length);
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for (int i = 0; i < sNum; i++) {
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assertEquals("s_" + i, stats[i].getPath().getName());
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}
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}
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// remove the last snapshot
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hdfs.deleteSnapshot(dir, "s_0");
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stats = hdfs.listStatus(snapshotsPath);
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assertEquals(0, stats.length);
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}
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}
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