HdfsLocalClusterIntegrationTest.java

/*
 *  Licensed 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 com.github.sakserv.minicluster.impl;

import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.HttpClients;
import static org.junit.Assert.assertEquals;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.sakserv.minicluster.config.ConfigVars;
import com.github.sakserv.propertyparser.PropertyParser;

public class HdfsLocalClusterIntegrationTest {

    // Logger
    private static final Logger LOG = LoggerFactory.getLogger(HdfsLocalClusterIntegrationTest.class);

    // Setup the property parser
    private static PropertyParser propertyParser;
    static {
        try {
            propertyParser = new PropertyParser(ConfigVars.DEFAULT_PROPS_FILE);
            propertyParser.parsePropsFile();
        } catch(IOException e) {
            LOG.error("Unable to load property file: {}", propertyParser.getProperty(ConfigVars.DEFAULT_PROPS_FILE));
        }
    }
    
    private static HdfsLocalCluster dfsCluster;

    @BeforeClass
    public static void setUp() throws Exception {
        dfsCluster = new HdfsLocalCluster.Builder()
                .setHdfsNamenodePort(Integer.parseInt(propertyParser.getProperty(ConfigVars.HDFS_NAMENODE_PORT_KEY)))
                .setHdfsNamenodeHttpPort( Integer.parseInt( propertyParser.getProperty( ConfigVars.HDFS_NAMENODE_HTTP_PORT_KEY ) ) )
                .setHdfsTempDir(propertyParser.getProperty(ConfigVars.HDFS_TEMP_DIR_KEY))
                .setHdfsNumDatanodes(Integer.parseInt(propertyParser.getProperty(ConfigVars.HDFS_NUM_DATANODES_KEY)))
                .setHdfsEnablePermissions(
                        Boolean.parseBoolean(propertyParser.getProperty(ConfigVars.HDFS_ENABLE_PERMISSIONS_KEY)))
                .setHdfsFormat(Boolean.parseBoolean(propertyParser.getProperty(ConfigVars.HDFS_FORMAT_KEY)))
                .setHdfsEnableRunningUserAsProxyUser(Boolean.parseBoolean(
                        propertyParser.getProperty(ConfigVars.HDFS_ENABLE_RUNNING_USER_AS_PROXY_USER)))
                .setHdfsConfig(new Configuration())
                .build();
        dfsCluster.start();
    }

    @AfterClass
    public static void tearDown() throws Exception {
        dfsCluster.stop();
    }

    @Test
    public void testDfsClusterStart() throws Exception {
        
        // Write a file to HDFS containing the test string
        FileSystem hdfsFsHandle = dfsCluster.getHdfsFileSystemHandle();
        FSDataOutputStream writer = hdfsFsHandle.create(
                new Path(propertyParser.getProperty(ConfigVars.HDFS_TEST_FILE_KEY)));
        writer.writeUTF(propertyParser.getProperty(ConfigVars.HDFS_TEST_STRING_KEY));
        writer.close();

        // Read the file and compare to test string
        FSDataInputStream reader = hdfsFsHandle.open(
                new Path(propertyParser.getProperty(ConfigVars.HDFS_TEST_FILE_KEY)));
        assertEquals(reader.readUTF(), propertyParser.getProperty(ConfigVars.HDFS_TEST_STRING_KEY));
        reader.close();
        hdfsFsHandle.close();

        URL url = new URL(
                String.format( "http://localhost:%s/webhdfs/v1?op=GETHOMEDIRECTORY&user.name=guest",
                        propertyParser.getProperty( ConfigVars.HDFS_NAMENODE_HTTP_PORT_KEY ) ) );
        URLConnection connection = url.openConnection();
        connection.setRequestProperty( "Accept-Charset", "UTF-8" );
        BufferedReader response = new BufferedReader( new InputStreamReader( connection.getInputStream() ) );
        String line = response.readLine();
        response.close();
        assertEquals( "{\"Path\":\"/user/guest\"}", line );

    }
}