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