hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDataStream.java

/**
 * 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 java.io.IOException;
import java.util.Random;

import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class TestDataStream {
  static MiniDFSCluster cluster;
  static int PACKET_SIZE = 1024;

  @BeforeClass
  public static void setup() throws IOException {
    Configuration conf = new Configuration();
    conf.setInt(HdfsClientConfigKeys.DFS_CLIENT_WRITE_PACKET_SIZE_KEY,
        PACKET_SIZE);
    conf.setInt(HdfsClientConfigKeys.DFS_CLIENT_SLOW_IO_WARNING_THRESHOLD_KEY,
        10000);
    conf.setInt(HdfsClientConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY, 60000);
    cluster = new MiniDFSCluster.Builder(conf).build();
  }

  @Test(timeout = 60000)
  public void testDfsClient() throws IOException, InterruptedException {
    LogCapturer logs = GenericTestUtils.LogCapturer.captureLogs(LoggerFactory
        .getLogger(DataStreamer.class));
    byte[] toWrite = new byte[PACKET_SIZE];
    new Random(1).nextBytes(toWrite);
    final Path path = new Path("/file1");
    final DistributedFileSystem dfs = cluster.getFileSystem();
    FSDataOutputStream out = null;
    out = dfs.create(path, false);
    
    out.write(toWrite);
    out.write(toWrite);
    out.hflush();
    
    //Wait to cross slow IO warning threshold
    Thread.sleep(15 * 1000);
    
    out.write(toWrite);
    out.write(toWrite);
    out.hflush();
    
    //Wait for capturing logs in busy cluster
    Thread.sleep(5 * 1000);

    out.close();
    logs.stopCapturing();
    GenericTestUtils.assertDoesNotMatch(logs.getOutput(),
        "Slow ReadProcessor read fields for block");
  }

  @AfterClass
  public static void tearDown() {
    cluster.shutdown();
  }

}