/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.io.FileNotFoundException;
import java.io.IOException;
/**
* Verify content summary is computed correctly when
* 1. There are snapshots taken under the directory
* 2. The given path is a snapshot path
*/
public class TestGetContentSummaryWithSnapshot {
protected static final short REPLICATION = 3;
protected static final long BLOCKSIZE = 1024;
protected Configuration conf;
protected MiniDFSCluster cluster;
protected FSNamesystem fsn;
protected FSDirectory fsdir;
protected DistributedFileSystem dfs;
@Rule
public ExpectedException exception = ExpectedException.none();
@Before
public void setUp() throws Exception {
conf = new Configuration();
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCKSIZE);
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION).build();
cluster.waitActive();
fsn = cluster.getNamesystem();
fsdir = fsn.getFSDirectory();
dfs = cluster.getFileSystem();
}
@After
public void tearDown() throws Exception {
if (cluster != null) {
cluster.shutdown();
}
}
/**
* Calculate against a snapshot path.
* 1. create dirs /foo/bar
* 2. take snapshot s1 on /foo
* 3. create a 10 byte file /foo/bar/baz
* Make sure for "/foo/bar" and "/foo/.snapshot/s1/bar" have correct results:
* the 1 byte file is not included in snapshot s1.
*/
@Test
public void testGetContentSummary() throws IOException {
final Path foo = new Path("/foo");
final Path bar = new Path(foo, "bar");
final Path baz = new Path(bar, "baz");
dfs.mkdirs(bar);
dfs.allowSnapshot(foo);
dfs.createSnapshot(foo, "s1");
DFSTestUtil.createFile(dfs, baz, 10, REPLICATION, 0L);
ContentSummary summary = cluster.getNameNodeRpc().getContentSummary(
bar.toString());
Assert.assertEquals(1, summary.getDirectoryCount());
Assert.assertEquals(1, summary.getFileCount());
Assert.assertEquals(10, summary.getLength());
final Path barS1 = SnapshotTestHelper.getSnapshotPath(foo, "s1", "bar");
summary = cluster.getNameNodeRpc().getContentSummary(barS1.toString());
Assert.assertEquals(1, summary.getDirectoryCount());
Assert.assertEquals(0, summary.getFileCount());
Assert.assertEquals(0, summary.getLength());
// also check /foo and /foo/.snapshot/s1
summary = cluster.getNameNodeRpc().getContentSummary(foo.toString());
Assert.assertEquals(2, summary.getDirectoryCount());
Assert.assertEquals(1, summary.getFileCount());
Assert.assertEquals(10, summary.getLength());
final Path fooS1 = SnapshotTestHelper.getSnapshotRoot(foo, "s1");
summary = cluster.getNameNodeRpc().getContentSummary(fooS1.toString());
Assert.assertEquals(2, summary.getDirectoryCount());
Assert.assertEquals(0, summary.getFileCount());
Assert.assertEquals(0, summary.getLength());
final Path bazS1 = SnapshotTestHelper.getSnapshotPath(foo, "s1", "bar/baz");
try {
cluster.getNameNodeRpc().getContentSummary(bazS1.toString());
Assert.fail("should get FileNotFoundException");
} catch (FileNotFoundException ignored) {}
}
}