org.apache.hadoop.hdfs.server.namenode.TestWaitingRoomPurger.java Source code

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Here is the source code for org.apache.hadoop.hdfs.server.namenode.TestWaitingRoomPurger.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.server.namenode;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import junit.framework.TestCase;
import java.io.*;
import java.util.*;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.common.Storage.*;
import org.apache.hadoop.hdfs.server.common.StorageInfo;
import org.apache.hadoop.hdfs.server.namenode.SnapshotNode.*;
import org.apache.hadoop.hdfs.server.namenode.WaitingRoom.*;
import org.apache.hadoop.net.NetUtils;

/**
 * Tests the Waiting Room Purger utility
 */
public class TestWaitingRoomPurger extends TestCase {

    private static final Log LOG = LogFactory.getLog(TestWaitingRoomPurger.class);

    public void testWaitingRoomPurger() throws IOException {
        Configuration conf = new Configuration();
        MiniDFSCluster cluster = new MiniDFSCluster(conf, 1, true, null);
        cluster.waitClusterUp();
        FileSystem fs = cluster.getFileSystem();

        WaitingRoom wr = new WaitingRoom(conf);
        WaitingRoomPurger purger = wr.getPurger();
        SnapshotNode ssNode = new SnapshotNode(conf);
        ssNode.shutdownWaitingRoomPurger();

        String wrPath = conf.get("fs.snapshot.waitingroom", "/.WR");
        String ssDir = conf.get("fs.snapshot.dir", "/.SNAPSHOT");

        Path foo = new Path("/foo");
        Path bar = new Path("/hadoop/bar");
        Path mash = new Path("/hadoop/mash");

        FSDataOutputStream stream;

        // Create foo
        stream = fs.create(foo);
        stream.writeByte(0);
        stream.close();

        // Move foo to waiting room.
        assertTrue(wr.moveToWaitingRoom(foo));

        // Create snapshot
        ssNode.createSnapshot("first", false); // contains nothing

        // Create bar (V1)
        stream = fs.create(bar);
        stream.write(0);
        stream.close();

        // Create mash (empty)
        stream = fs.create(mash);
        stream.close();

        // Create snapshot
        ssNode.createSnapshot("second", false); // contains bar (V1), mash

        // Move mash, bar to waiting room
        assertTrue(wr.moveToWaitingRoom(mash));
        assertTrue(wr.moveToWaitingRoom(bar));

        // Create bar (V2)
        stream = fs.create(bar);
        stream.write(0);
        stream.close();

        ssNode.createSnapshot("third", false); // contains bar (V2)

        // Verify fs state right now
        assertTrue(fs.exists(bar));
        assertFalse(fs.exists(foo));
        assertFalse(fs.exists(mash));
        assertTrue(fs.exists(new Path(wrPath + "/foo")));
        assertTrue(fs.exists(new Path(wrPath + "/hadoop/bar")));
        assertTrue(fs.exists(new Path(wrPath + "/hadoop/mash")));

        // Run purger
        purger.purge();

        // Verify fs state right now
        assertTrue(fs.exists(bar));
        assertFalse(fs.exists(foo));
        assertFalse(fs.exists(mash));
        assertFalse(fs.exists(new Path(wrPath + "/foo"))); // deleted: unreferenced
        assertTrue(fs.exists(new Path(wrPath + "/hadoop/bar")));
        assertFalse(fs.exists(new Path(wrPath + "/hadoop/mash"))); // deleted: empty

        // Delete snapshot 'second'
        boolean success = fs.delete(new Path(ssDir + "/" + SnapshotNode.SSNAME + "second"));
        assertTrue(success);

        // Run purger again
        purger.purge();

        // Verify fs state right now
        assertTrue(fs.exists(bar));
        assertFalse(fs.exists(foo));
        assertFalse(fs.exists(mash));
        assertFalse(fs.exists(new Path(wrPath + "/foo"))); // deleted: last run
        assertFalse(fs.exists(new Path(wrPath + "/hadoop/bar"))); // deleted: unreferenced
        assertFalse(fs.exists(new Path(wrPath + "/hadoop/mash"))); // deleted: last run
    }
}