org.apache.flink.tachyon.FileStateHandleTest.java Source code

Introduction

Here is the source code for org.apache.flink.tachyon.FileStateHandleTest.java

Source

/*
 * 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.tachyon;

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

import java.io.File;
import java.io.IOException;
import java.io.Serializable;

import org.apache.flink.runtime.state.FileStateHandle;
import org.apache.flink.runtime.state.StateHandle;
import org.apache.flink.runtime.state.StateHandleProvider;
import org.apache.flink.runtime.util.SerializedValue;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class FileStateHandleTest {

    private String hdfsURI;
    private MiniDFSCluster hdfsCluster;
    private org.apache.hadoop.fs.Path hdPath;
    private org.apache.hadoop.fs.FileSystem hdfs;

    @Before
    public void createHDFS() {
        try {
            Configuration hdConf = new Configuration();

            File baseDir = new File("./target/hdfs/filestatehandletest").getAbsoluteFile();
            FileUtil.fullyDelete(baseDir);
            hdConf.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR, baseDir.getAbsolutePath());
            MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(hdConf);
            hdfsCluster = builder.build();

            hdfsURI = "hdfs://" + hdfsCluster.getURI().getHost() + ":" + hdfsCluster.getNameNodePort() + "/";

            hdPath = new org.apache.hadoop.fs.Path("/StateHandleTest");
            hdfs = hdPath.getFileSystem(hdConf);
            hdfs.mkdirs(hdPath);

        } catch (Throwable e) {
            e.printStackTrace();
            Assert.fail("Test failed " + e.getMessage());
        }
    }

    @After
    public void destroyHDFS() {
        try {
            hdfs.delete(hdPath, true);
            hdfsCluster.shutdown();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

    @Test
    public void testFileStateHandle() throws Exception {

        Serializable state = "state";

        // Create a state handle provider for the hdfs directory
        StateHandleProvider<Serializable> handleProvider = FileStateHandle.createProvider(hdfsURI + hdPath);

        FileStateHandle handle = (FileStateHandle) handleProvider.createStateHandle(state);

        try {
            handleProvider.createStateHandle(null);
            fail();
        } catch (RuntimeException e) {
            // good
        }

        assertTrue(handle.stateFetched());
        assertFalse(handle.isWritten());

        // Serialize the handle so it writes the value to hdfs
        SerializedValue<StateHandle<Serializable>> serializedHandle = new SerializedValue<StateHandle<Serializable>>(
                handle);

        assertTrue(handle.isWritten());

        // Deserialize the handle and verify that the state is not fetched yet
        FileStateHandle deserializedHandle = (FileStateHandle) serializedHandle
                .deserializeValue(Thread.currentThread().getContextClassLoader());
        assertFalse(deserializedHandle.stateFetched());

        // Fetch the and compare with original
        assertEquals(state, deserializedHandle.getState());

        // Test whether discard removes the checkpoint file properly
        assertTrue(hdfs.listFiles(hdPath, true).hasNext());
        deserializedHandle.discardState();
        assertFalse(hdfs.listFiles(hdPath, true).hasNext());

    }

}