@Test
  public void testAllFieldsWritable() throws IOException {
    RangeInputSplit split =
        new RangeInputSplit(
            "table", "1", new Range(new Key("a"), new Key("b")), new String[] {"localhost"});

    Set<Pair<Text, Text>> fetchedColumns = new HashSet<Pair<Text, Text>>();

    fetchedColumns.add(new Pair<Text, Text>(new Text("colf1"), new Text("colq1")));
    fetchedColumns.add(new Pair<Text, Text>(new Text("colf2"), new Text("colq2")));

    // Fake some iterators
    ArrayList<IteratorSetting> iterators = new ArrayList<IteratorSetting>();
    IteratorSetting setting = new IteratorSetting(50, SummingCombiner.class);
    setting.addOption("foo", "bar");
    iterators.add(setting);

    setting = new IteratorSetting(100, WholeRowIterator.class);
    setting.addOption("bar", "foo");
    iterators.add(setting);

    split.setTableName("table");
    split.setAuths(new Authorizations("foo"));
    split.setOffline(true);
    split.setIsolatedScan(true);
    split.setUsesLocalIterators(true);
    split.setFetchedColumns(fetchedColumns);
    split.setToken(new PasswordToken("password"));
    split.setPrincipal("root");
    split.setInstanceName("instance");
    DeprecationUtil.setMockInstance(split, true);
    split.setZooKeepers("localhost");
    split.setIterators(iterators);
    split.setLogLevel(Level.WARN);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream dos = new DataOutputStream(baos);
    split.write(dos);

    RangeInputSplit newSplit = new RangeInputSplit();

    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    DataInputStream dis = new DataInputStream(bais);
    newSplit.readFields(dis);

    Assert.assertEquals(split.getRange(), newSplit.getRange());
    Assert.assertArrayEquals(split.getLocations(), newSplit.getLocations());

    Assert.assertEquals(split.getTableName(), newSplit.getTableName());
    Assert.assertEquals(split.getAuths(), newSplit.getAuths());
    Assert.assertEquals(split.isOffline(), newSplit.isOffline());
    Assert.assertEquals(split.isIsolatedScan(), newSplit.isOffline());
    Assert.assertEquals(split.usesLocalIterators(), newSplit.usesLocalIterators());
    Assert.assertEquals(split.getFetchedColumns(), newSplit.getFetchedColumns());
    Assert.assertEquals(split.getToken(), newSplit.getToken());
    Assert.assertEquals(split.getPrincipal(), newSplit.getPrincipal());
    Assert.assertEquals(split.getInstanceName(), newSplit.getInstanceName());
    Assert.assertEquals(
        DeprecationUtil.isMockInstanceSet(split), DeprecationUtil.isMockInstanceSet(newSplit));
    Assert.assertEquals(split.getZooKeepers(), newSplit.getZooKeepers());
    Assert.assertEquals(split.getIterators(), newSplit.getIterators());
    Assert.assertEquals(split.getLogLevel(), newSplit.getLogLevel());
  }
  /**
   * Gets the splits of the tables that have been set on the job by reading the metadata table for
   * the specified ranges.
   *
   * @return the splits from the tables based on the ranges.
   * @throws java.io.IOException if a table set on the job doesn't exist or an error occurs
   *     initializing the tablet locator
   */
  @Override
  public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
    Level logLevel = getLogLevel(job);
    log.setLevel(logLevel);
    validateOptions(job);

    Random random = new Random();
    LinkedList<InputSplit> splits = new LinkedList<InputSplit>();
    Map<String, InputTableConfig> tableConfigs = getInputTableConfigs(job);
    for (Map.Entry<String, InputTableConfig> tableConfigEntry : tableConfigs.entrySet()) {
      String tableName = tableConfigEntry.getKey();
      InputTableConfig tableConfig = tableConfigEntry.getValue();

      Instance instance = getInstance(job);
      String tableId;
      // resolve table name to id once, and use id from this point forward
      if (DeprecationUtil.isMockInstance(instance)) {
        tableId = "";
      } else {
        try {
          tableId = Tables.getTableId(instance, tableName);
        } catch (TableNotFoundException e) {
          throw new IOException(e);
        }
      }

      Authorizations auths = getScanAuthorizations(job);
      String principal = getPrincipal(job);
      AuthenticationToken token = getAuthenticationToken(job);

      boolean batchScan = InputConfigurator.isBatchScan(CLASS, job);
      boolean supportBatchScan =
          !(tableConfig.isOfflineScan()
              || tableConfig.shouldUseIsolatedScanners()
              || tableConfig.shouldUseLocalIterators());
      if (batchScan && !supportBatchScan)
        throw new IllegalArgumentException(
            "BatchScanner optimization not available for offline scan, isolated, or local iterators");

      boolean autoAdjust = tableConfig.shouldAutoAdjustRanges();
      if (batchScan && !autoAdjust)
        throw new IllegalArgumentException(
            "AutoAdjustRanges must be enabled when using BatchScanner optimization");

      List<Range> ranges =
          autoAdjust ? Range.mergeOverlapping(tableConfig.getRanges()) : tableConfig.getRanges();
      if (ranges.isEmpty()) {
        ranges = new ArrayList<Range>(1);
        ranges.add(new Range());
      }

      // get the metadata information for these ranges
      Map<String, Map<KeyExtent, List<Range>>> binnedRanges =
          new HashMap<String, Map<KeyExtent, List<Range>>>();
      TabletLocator tl;
      try {
        if (tableConfig.isOfflineScan()) {
          binnedRanges = binOfflineTable(job, tableId, ranges);
          while (binnedRanges == null) {
            // Some tablets were still online, try again
            // sleep randomly between 100 and 200 ms
            sleepUninterruptibly(100 + random.nextInt(100), TimeUnit.MILLISECONDS);
            binnedRanges = binOfflineTable(job, tableId, ranges);
          }
        } else {
          tl = InputConfigurator.getTabletLocator(CLASS, job, tableId);
          // its possible that the cache could contain complete, but old information about a tables
          // tablets... so clear it
          tl.invalidateCache();

          ClientContext context =
              new ClientContext(
                  getInstance(job),
                  new Credentials(getPrincipal(job), getAuthenticationToken(job)),
                  getClientConfiguration(job));
          while (!tl.binRanges(context, ranges, binnedRanges).isEmpty()) {
            if (!DeprecationUtil.isMockInstance(instance)) {
              if (!Tables.exists(instance, tableId)) throw new TableDeletedException(tableId);
              if (Tables.getTableState(instance, tableId) == TableState.OFFLINE)
                throw new TableOfflineException(instance, tableId);
            }
            binnedRanges.clear();
            log.warn("Unable to locate bins for specified ranges. Retrying.");
            // sleep randomly between 100 and 200 ms
            sleepUninterruptibly(100 + random.nextInt(100), TimeUnit.MILLISECONDS);
            tl.invalidateCache();
          }
        }
      } catch (Exception e) {
        throw new IOException(e);
      }

      HashMap<Range, ArrayList<String>> splitsToAdd = null;

      if (!autoAdjust) splitsToAdd = new HashMap<Range, ArrayList<String>>();

      HashMap<String, String> hostNameCache = new HashMap<String, String>();
      for (Map.Entry<String, Map<KeyExtent, List<Range>>> tserverBin : binnedRanges.entrySet()) {
        String ip = tserverBin.getKey().split(":", 2)[0];
        String location = hostNameCache.get(ip);
        if (location == null) {
          InetAddress inetAddress = InetAddress.getByName(ip);
          location = inetAddress.getCanonicalHostName();
          hostNameCache.put(ip, location);
        }
        for (Map.Entry<KeyExtent, List<Range>> extentRanges : tserverBin.getValue().entrySet()) {
          Range ke = extentRanges.getKey().toDataRange();
          if (batchScan) {
            // group ranges by tablet to be read by a BatchScanner
            ArrayList<Range> clippedRanges = new ArrayList<Range>();
            for (Range r : extentRanges.getValue()) clippedRanges.add(ke.clip(r));

            BatchInputSplit split =
                new BatchInputSplit(tableName, tableId, clippedRanges, new String[] {location});
            SplitUtils.updateSplit(split, instance, tableConfig, principal, token, auths, logLevel);

            splits.add(split);
          } else {
            // not grouping by tablet
            for (Range r : extentRanges.getValue()) {
              if (autoAdjust) {
                // divide ranges into smaller ranges, based on the tablets
                RangeInputSplit split =
                    new RangeInputSplit(tableName, tableId, ke.clip(r), new String[] {location});
                SplitUtils.updateSplit(
                    split, instance, tableConfig, principal, token, auths, logLevel);
                split.setOffline(tableConfig.isOfflineScan());
                split.setIsolatedScan(tableConfig.shouldUseIsolatedScanners());
                split.setUsesLocalIterators(tableConfig.shouldUseLocalIterators());

                splits.add(split);
              } else {
                // don't divide ranges
                ArrayList<String> locations = splitsToAdd.get(r);
                if (locations == null) locations = new ArrayList<String>(1);
                locations.add(location);
                splitsToAdd.put(r, locations);
              }
            }
          }
        }
      }

      if (!autoAdjust)
        for (Map.Entry<Range, ArrayList<String>> entry : splitsToAdd.entrySet()) {
          RangeInputSplit split =
              new RangeInputSplit(
                  tableName, tableId, entry.getKey(), entry.getValue().toArray(new String[0]));
          SplitUtils.updateSplit(split, instance, tableConfig, principal, token, auths, logLevel);
          split.setOffline(tableConfig.isOfflineScan());
          split.setIsolatedScan(tableConfig.shouldUseIsolatedScanners());
          split.setUsesLocalIterators(tableConfig.shouldUseLocalIterators());

          splits.add(split);
        }
    }

    return splits.toArray(new InputSplit[splits.size()]);
  }