org.apache.flink.yarn.highavailability.YarnIntraNonHaMasterServicesTest.java Source code

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Here is the source code for org.apache.flink.yarn.highavailability.YarnIntraNonHaMasterServicesTest.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.flink.yarn.highavailability;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.leaderelection.LeaderContender;
import org.apache.flink.runtime.leaderelection.LeaderElectionService;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalListener;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalService;
import org.apache.flink.util.StringUtils;

import org.apache.flink.util.TestLogger;
import org.apache.hadoop.hdfs.MiniDFSCluster;

import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.io.File;
import java.util.Random;
import java.util.UUID;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.timeout;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

public class YarnIntraNonHaMasterServicesTest extends TestLogger {

    private static final Random RND = new Random();

    @ClassRule
    public static final TemporaryFolder TEMP_DIR = new TemporaryFolder();

    private static MiniDFSCluster HDFS_CLUSTER;

    private static Path HDFS_ROOT_PATH;

    private org.apache.hadoop.conf.Configuration hadoopConfig;

    // ------------------------------------------------------------------------
    //  Test setup and shutdown
    // ------------------------------------------------------------------------

    @BeforeClass
    public static void createHDFS() throws Exception {
        final File tempDir = TEMP_DIR.newFolder();

        org.apache.hadoop.conf.Configuration hdConf = new org.apache.hadoop.conf.Configuration();
        hdConf.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR, tempDir.getAbsolutePath());

        MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(hdConf);
        HDFS_CLUSTER = builder.build();
        HDFS_ROOT_PATH = new Path(HDFS_CLUSTER.getURI());
    }

    @AfterClass
    public static void destroyHDFS() {
        if (HDFS_CLUSTER != null) {
            HDFS_CLUSTER.shutdown();
        }
        HDFS_CLUSTER = null;
        HDFS_ROOT_PATH = null;
    }

    @Before
    public void initConfig() {
        hadoopConfig = new org.apache.hadoop.conf.Configuration();
        hadoopConfig.set(org.apache.hadoop.fs.FileSystem.FS_DEFAULT_NAME_KEY, HDFS_ROOT_PATH.toString());
    }

    // ------------------------------------------------------------------------
    //  Tests
    // ------------------------------------------------------------------------

    @Test
    public void testRepeatedClose() throws Exception {
        final Configuration flinkConfig = new Configuration();

        final YarnHighAvailabilityServices services = new YarnIntraNonHaMasterServices(flinkConfig, hadoopConfig);
        services.closeAndCleanupAllData();

        // this should not throw an exception
        services.close();
    }

    @Test
    public void testClosingReportsToLeader() throws Exception {
        final Configuration flinkConfig = new Configuration();

        try (YarnHighAvailabilityServices services = new YarnIntraNonHaMasterServices(flinkConfig, hadoopConfig)) {
            final LeaderElectionService elector = services.getResourceManagerLeaderElectionService();
            final LeaderRetrievalService retrieval = services.getResourceManagerLeaderRetriever();
            final LeaderContender contender = mockContender(elector);
            final LeaderRetrievalListener listener = mock(LeaderRetrievalListener.class);

            elector.start(contender);
            retrieval.start(listener);

            // wait until the contender has become the leader
            verify(listener, timeout(1000L).times(1)).notifyLeaderAddress(anyString(), any(UUID.class));

            // now we can close the election service
            services.close();

            verify(contender, timeout(1000L).times(1)).handleError(any(Exception.class));
        }
    }

    // ------------------------------------------------------------------------
    //  utilities
    // ------------------------------------------------------------------------

    private static LeaderContender mockContender(final LeaderElectionService service) {
        String address = StringUtils.getRandomString(RND, 5, 10, 'a', 'z');
        return mockContender(service, address);
    }

    private static LeaderContender mockContender(final LeaderElectionService service, final String address) {
        LeaderContender mockContender = mock(LeaderContender.class);

        when(mockContender.getAddress()).thenReturn(address);

        doAnswer(new Answer<Void>() {
            @Override
            public Void answer(InvocationOnMock invocation) throws Throwable {
                final UUID uuid = (UUID) invocation.getArguments()[0];
                service.confirmLeaderSessionID(uuid);
                return null;
            }
        }).when(mockContender).grantLeadership(any(UUID.class));

        return mockContender;
    }
}