org.apache.hadoop.hdfs.TestDFSRename.java Source code

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Here is the source code for org.apache.hadoop.hdfs.TestDFSRename.java

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/**
 * 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;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.junit.Test;

public class TestDFSRename {
    static int countLease(MiniDFSCluster cluster) {
        return NameNodeAdapter.getLeaseManager(cluster.getNamesystem()).countLease();
    }

    final Path dir = new Path("/test/rename/");
    Log LOG = LogFactory.getLog(TestListFilesInDFS.class);

    void list(FileSystem fs, String name) throws IOException {
        LOG.info("\n\n" + name);
        for (FileStatus s : fs.listStatus(dir)) {
            LOG.info("" + s.getPath());
        }
    }

    static void createFile(FileSystem fs, Path f) throws IOException {
        DataOutputStream a_out = fs.create(f);
        a_out.writeBytes("something");
        a_out.close();
    }

    @Test
    public void testRename() throws Exception {
        Configuration conf = new HdfsConfiguration();
        MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build();
        try {
            FileSystem fs = cluster.getFileSystem();
            assertTrue(fs.mkdirs(dir));

            { //test lease
                Path a = new Path(dir, "a");
                Path aa = new Path(dir, "aa");
                Path b = new Path(dir, "b");

                createFile(fs, a);

                //should not have any lease
                assertEquals(0, countLease(cluster));

                DataOutputStream aa_out = fs.create(aa);
                aa_out.writeBytes("something");

                //should have 1 lease
                assertEquals(1, countLease(cluster));
                list(fs, "rename0");
                fs.rename(a, b);
                list(fs, "rename1");
                aa_out.writeBytes(" more");
                aa_out.close();
                list(fs, "rename2");

                //should not have any lease
                assertEquals(0, countLease(cluster));
            }

            { // test non-existent destination
                Path dstPath = new Path("/c/d");
                assertFalse(fs.exists(dstPath));
                assertFalse(fs.rename(dir, dstPath));
            }

            { // dst cannot be a file or directory under src
              // test rename /a/b/foo to /a/b/c
                Path src = new Path("/a/b");
                Path dst = new Path("/a/b/c");

                createFile(fs, new Path(src, "foo"));

                // dst cannot be a file under src
                assertFalse(fs.rename(src, dst));

                // dst cannot be a directory under src
                assertFalse(fs.rename(src.getParent(), dst.getParent()));
            }

            { // dst can start with src, if it is not a directory or file under src
              // test rename /test /testfile
                Path src = new Path("/testPrefix");
                Path dst = new Path("/testPrefixfile");

                createFile(fs, src);
                assertTrue(fs.rename(src, dst));
            }

            { // dst should not be same as src test rename /a/b/c to /a/b/c
                Path src = new Path("/a/b/c");
                createFile(fs, src);
                assertTrue(fs.rename(src, src));
                assertFalse(fs.rename(new Path("/a/b"), new Path("/a/b/")));
                assertTrue(fs.rename(src, new Path("/a/b/c/")));
            }
            fs.delete(dir, true);
        } finally {
            if (cluster != null) {
                cluster.shutdown();
            }
        }
    }
}