Package org.apache.hadoop.hdfs

Examples of org.apache.hadoop.hdfs.SnapshotClient


    MiniDFSCluster cluster = new MiniDFSCluster(conf, 4, true, null);

    SnapshotNode ssNode = new SnapshotNode(conf);
    WaitingRoom wr = new WaitingRoom(conf);
    DFSClient client = new DFSClient(conf);
    SnapshotClient ssClient = new SnapshotClient(conf);

    FileSystem dfs = cluster.getFileSystem();
    String ssDir = conf.get("fs.snapshot.dir", "/.SNAPSHOT");

    Path foo = new Path("/foo");
    Path bar = new Path("/bar");

    FSDataOutputStream out;

    out = dfs.create(foo);
    out.write(0);
    out.close();

    out = dfs.create(bar);
    out.write(1);
    out.sync();

    ssNode.createSnapshot("test", true);

    out.write(2);
    out.close();

    wr.moveToWaitingRoom(foo); // delete

    // Current system has foo deleted and bar with length 2
    // test snapshot has foo with length 1 and bar with length 1

    // Checking current file system
    assertTrue(!dfs.exists(foo));
    DFSInputStream in = client.open("/bar");
    assertTrue(in.getFileLength() == 2);
    assertTrue(in.read() == 1);
    assertTrue(in.read() == 2);
    assertTrue(in.read() == -1); //eof

    // Checking test snapshot
    in = ssClient.open("test", "/foo");
    assertTrue(in.getFileLength() == 1);
    assertTrue(in.read() == 0);
    assertTrue(in.read() == -1); //eof
    in = ssClient.open("test", "/bar");
    assertTrue(in.getFileLength() == 1);
    assertTrue(in.read() == 1);
    assertTrue(in.read() == -1); //eof
  }
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