io.aos.hdfs.CoherencyModelTest.java Source code

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Here is the source code for io.aos.hdfs.CoherencyModelTest.java

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package io.aos.hdfs;

// == CoherencyModelTest
// == CoherencyModelTest-NotVisibleAfterFlush
// == CoherencyModelTest-VisibleAfterFlushAndSync
// == CoherencyModelTest-LocalFileVisibleAfterFlush
// == CoherencyModelTest-VisibleAfterClose
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;

public class CoherencyModelTest {
    private MiniDFSCluster cluster; // use an in-process HDFS cluster for testing
    private FileSystem fs;

    @Before
    public void setUp() throws IOException {
        Configuration conf = new Configuration();
        if (System.getProperty("test.build.data") == null) {
            System.setProperty("test.build.data", "/tmp");
        }
        cluster = new MiniDFSCluster(conf, 1, true, null);
        fs = cluster.getFileSystem();
    }

    @After
    public void tearDown() throws IOException {
        fs.close();
        cluster.shutdown();
    }

    @Test
    public void fileExistsImmediatelyAfterCreation() throws IOException {
        // vv CoherencyModelTest
        Path p = new Path("p");
        fs.create(p);
        assertThat(fs.exists(p), is(true));
        // ^^ CoherencyModelTest
        assertThat(fs.delete(p, true), is(true));
    }

    @Test
    public void fileContentIsNotVisibleAfterFlush() throws IOException {
        // vv CoherencyModelTest-NotVisibleAfterFlush
        Path p = new Path("p");
        OutputStream out = fs.create(p);
        out.write("content".getBytes("UTF-8"));
        /*[*/out.flush();/*]*/
        assertThat(fs.getFileStatus(p).getLen(), is(0L));
        // ^^ CoherencyModelTest-NotVisibleAfterFlush
        out.close();
        assertThat(fs.delete(p, true), is(true));
    }

    @Test
    @Ignore("See https://issues.apache.org/jira/browse/HADOOP-4379")
    public void fileContentIsVisibleAfterFlushAndSync() throws IOException {
        // vv CoherencyModelTest-VisibleAfterFlushAndSync
        Path p = new Path("p");
        FSDataOutputStream out = fs.create(p);
        out.write("content".getBytes("UTF-8"));
        out.flush();
        //    /*[*/out.sync();/*]*/
        assertThat(fs.getFileStatus(p).getLen(), is(((long) "content".length())));
        // ^^ CoherencyModelTest-VisibleAfterFlushAndSync
        out.close();
        assertThat(fs.delete(p, true), is(true));
    }

    @Test
    public void localFileContentIsVisibleAfterFlushAndSync() throws IOException {
        File localFile = File.createTempFile("tmp", "");
        assertThat(localFile.exists(), is(true));
        // vv CoherencyModelTest-LocalFileVisibleAfterFlush
        FileOutputStream out = new FileOutputStream(localFile);
        out.write("content".getBytes("UTF-8"));
        out.flush(); // flush to operating system
        out.getFD().sync(); // sync to disk
        assertThat(localFile.length(), is(((long) "content".length())));
        // ^^ CoherencyModelTest-LocalFileVisibleAfterFlush
        out.close();
        assertThat(localFile.delete(), is(true));
    }

    @Test
    public void fileContentIsVisibleAfterClose() throws IOException {
        // vv CoherencyModelTest-VisibleAfterClose
        Path p = new Path("p");
        OutputStream out = fs.create(p);
        out.write("content".getBytes("UTF-8"));
        /*[*/out.close();/*]*/
        assertThat(fs.getFileStatus(p).getLen(), is(((long) "content".length())));
        // ^^ CoherencyModelTest-VisibleAfterClose
        assertThat(fs.delete(p, true), is(true));
    }

}