Examples of org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes()

Class org.apache.hadoop.hdfs.MiniDFSCluster

Examples of org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes()

org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes()
Modify the config and start up additional DataNodes. The info port for DataNodes is guaranteed to use a free port. Data nodes can run with the name node in the mini cluster or a real name node. For example, running with a real name node is useful when running simulated data nodes with a real name node. If minicluster's name node is null assume that the conf has been set with the right address:port of the name node. @param conf the base configuration to use in starting the DataNodes. Thiswill be modified as necessary. @param numDataNodes Number of DataNodes to start; may be zero @param manageDfsDirs if true, the data directories for DataNodes will becreated and dfs.data.dir will be set in the conf @param operation the operation with which to start the DataNodes. If nullor StartupOption.FORMAT, then StartupOption.REGULAR will be used. @param racks array of strings indicating the rack that each DataNode is on @param hosts array of strings indicating the hostnames for each DataNode @param simulatedCapacities array of capacities of the simulated data nodes @throws IllegalStateException if NameNode has been shutdown

      assertEquals(file5.getName(), fileSplit.getPath(1).getName());
      assertEquals(0, fileSplit.getOffset(1));
      assertEquals(BLOCKSIZE, fileSplit.getLength(1));
      assertEquals(hosts1[0], fileSplit.getLocations()[0]);
      
      dfs.startDataNodes(conf, 1, true, null, rack2, hosts2, null);
      dfs.waitActive();


      // create file on two datanodes.
      Path file2 = new Path(dir2 + "/file2");
      writeFile(conf, file2, (short)2, 2);

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      assertEquals(fileSplit.getOffset(0), 0);
      assertEquals(fileSplit.getLength(0), BLOCKSIZE);
      assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1


      // create another file on 3 datanodes and 3 racks.
      dfs.startDataNodes(conf, 1, true, null, rack3, hosts3, null);
      dfs.waitActive();
      Path file3 = new Path(dir3 + "/file3");
      writeFile(conf, new Path(dir3 + "/file3"), (short)3, 3);
      inFormat = new DummyInputFormat();
      FileInputFormat.setInputPaths(job, dir1 + "," + dir2 + "," + dir3);

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      assertEquals(file5.getName(), fileSplit.getPath(1).getName());
      assertEquals(0, fileSplit.getOffset(1));
      assertEquals(f5.getLen(), fileSplit.getLength(1));
      assertEquals(hosts1[0], fileSplit.getLocations()[0]);
      
      dfs.startDataNodes(conf, 1, true, null, rack2, hosts2, null);
      dfs.waitActive();


      // create file on two datanodes.
      Path file2 = new Path(dir2 + "/file2.gz");
      FileStatus f2 = writeGzipFile(conf, file2, (short)2, 2);

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      assertEquals(0, fileSplit.getOffset(0));
      assertEquals(f1.getLen(), fileSplit.getLength(0));
      assertEquals(hosts1[0], fileSplit.getLocations()[0]); // should be on r1


      // create another file on 3 datanodes and 3 racks.
      dfs.startDataNodes(conf, 1, true, null, rack3, hosts3, null);
      dfs.waitActive();
      Path file3 = new Path(dir3 + "/file3.gz");
      FileStatus f3 = writeGzipFile(conf, file3, (short)3, 3);
      inFormat = new DummyInputFormat();
      FileInputFormat.setInputPaths(job, dir1 + "," + dir2 + "," + dir3);

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      // Write the input file
      UtilsForTests.writeFile(dfs.getNameNode(), conf, 
                              new Path(inDir + "/file"), (short)1);


      dfs.startDataNodes(conf, 1, true, null, null, null, null);
      dfs.waitActive();


      namenode = (dfs.getFileSystem()).getUri().getHost() + ":" 
                 + (dfs.getFileSystem()).getUri().getPort();

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      ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, filePath);
      DFSTestUtil.waitForReplication(cluster, b, 1, REPLICATION_FACTOR, 0);


      // Add a new datanode on a different rack
      String newRacks[] = {"/rack2"};
      cluster.startDataNodes(conf, 1, true, null, newRacks);
      cluster.waitActive();


      DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    } finally {
      cluster.shutdown();

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      // Add new datanodes on a different rack and increase the
      // replication factor so the block is underreplicated and make
      // sure at least one of the hosts on the new rack is used. 
      String newRacks[] = {"/rack2", "/rack2"};
      cluster.startDataNodes(conf, 2, true, null, newRacks);
      REPLICATION_FACTOR = 5;
      NameNodeAdapter.setReplication(ns, "/testFile", REPLICATION_FACTOR);


      DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    } finally {

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      // Start the "failed" datanode, which has a replica so the block is
      // now over-replicated and therefore a replica should be removed but
      // not on the restarted datanode as that would violate the rack policy.
      String rack2[] = {"/rack2"};
      cluster.startDataNodes(conf, 1, true, null, rack2);
      cluster.waitActive();      
      
      // The block now has sufficient # replicas, across racks
      DFSTestUtil.waitForReplication(cluster, b, 2, REPLICATION_FACTOR, 0);
    } finally {

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      // expect the result is corrupt
      assertTrue(outStr.contains(NamenodeFsck.CORRUPT_STATUS));
      System.out.println(outStr);
      
      // bring up data nodes & cleanup cluster
      cluster.startDataNodes(conf, 4, true, null, null);
      cluster.waitActive();
      cluster.waitClusterUp();
      fs = cluster.getFileSystem();
      util.cleanup(fs, "/srcdat");
    } finally {

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    JobConf conf = new JobConf();
    MiniDFSCluster dfs = new MiniDFSCluster(conf, 1, true, null, null);
    dfs.waitActive();
    FileSystem fileSys = dfs.getFileSystem();
    
    dfs.startDataNodes(conf, 1, true, null, null, null, null);
    dfs.waitActive();
    
    String namenode = (dfs.getFileSystem()).getUri().getHost() + ":" 
                      + (dfs.getFileSystem()).getUri().getPort();
    MiniMRCluster mr = new MiniMRCluster(1, namenode, 1);

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