private static Method findCounterMethod(TaskAttemptContext context) {
  if (context != null) {
    if (COUNTER_METHODS_BY_CLASS.containsKey(context.getClass())) {
      return COUNTER_METHODS_BY_CLASS.get(context.getClass());
    }

    try {
      Method method = context.getClass().getMethod("getCounter", String.class, String.class);
      if (method.getReturnType().isAssignableFrom(Counter.class)) {
        COUNTER_METHODS_BY_CLASS.put(context.getClass(), method);
        return method;
      }
    } catch (NoSuchMethodException e) {
      return null;
    }
  }

  return null;
}
 

@Override
public JsonElement serialize(CounterGroup cg, Type t, JsonSerializationContext ctx) {
    JsonObject obj = new JsonObject();
    if (!cg.getName().equals(cg.getDisplayName()))
        obj.addProperty("displayName", cg.getDisplayName());
    JsonObject dns = new JsonObject();
    boolean anyNamesDiffer = false;
    for (Counter c : cg) {
        obj.addProperty(c.getName(), c.getValue());
        if (!c.getName().equals(c.getDisplayName()))
            anyNamesDiffer = true;
        dns.addProperty(c.getName(), c.getDisplayName());
    }
    if (anyNamesDiffer)
        obj.add("displayNames", dns);
    return obj;
}
 

/**
 * Create a {@link org.apache.gobblin.metrics.GobblinMetrics} instance for this job run from the Hadoop counters.
 */
@VisibleForTesting
void countersToMetrics(GobblinMetrics metrics) throws IOException {
  Optional<Counters> counters = Optional.fromNullable(this.job.getCounters());

  if (counters.isPresent()) {
    // Write job-level counters
    CounterGroup jobCounterGroup = counters.get().getGroup(MetricGroup.JOB.name());
    for (Counter jobCounter : jobCounterGroup) {
      metrics.getCounter(jobCounter.getName()).inc(jobCounter.getValue());
    }

    // Write task-level counters
    CounterGroup taskCounterGroup = counters.get().getGroup(MetricGroup.TASK.name());
    for (Counter taskCounter : taskCounterGroup) {
      metrics.getCounter(taskCounter.getName()).inc(taskCounter.getValue());
    }
  }
}
 

/**
 * Construct from another counters object.
 * @param <C1> type of the other counter
 * @param <G1> type of the other counter group
 * @param counters the counters object to copy
 * @param groupFactory the factory for new groups
 */
@InterfaceAudience.Private
public <C1 extends Counter, G1 extends CounterGroupBase<C1>>
AbstractCounters(AbstractCounters<C1, G1> counters,
                 CounterGroupFactory<C, G> groupFactory) {
  this.groupFactory = groupFactory;
  for(G1 group: counters) {
    String name = group.getName();
    G newGroup = groupFactory.newGroup(name, group.getDisplayName(), limits);
    (isFrameworkGroup(name) ? fgroups : groups).put(name, newGroup);
    for(Counter counter: group) {
      newGroup.addCounter(counter.getName(), counter.getDisplayName(),
                          counter.getValue());
    }
  }
}
 

@Override
protected void setup(final Context context) throws IOException, InterruptedException {
  BlurOutputFormat.setProgressable(context);
  BlurOutputFormat.setGetCounter(new GetCounter() {
    @Override
    public Counter getCounter(Enum<?> counterName) {
      return context.getCounter(counterName);
    }
  });

  _newRecordsUpdate = context.getCounter(BLUR_UPDATE, NEW_RECORDS + SEP + UPDATE);
  _newRecordsNoUpdate = context.getCounter(BLUR_UPDATE, NEW_RECORDS + SEP + NO_UPDATE);
  _existingRecordsUpdate = context.getCounter(BLUR_UPDATE, EXISTING_RECORDS + SEP + UPDATE);
  _existingRecordsNoUpdate = context.getCounter(BLUR_UPDATE, EXISTING_RECORDS + SEP + NO_UPDATE);
  _ignoredExistingRows = context.getCounter(BLUR_UPDATE, IGNORED_EXISTING_ROWS);

  _debugRecordsWithSameRecordId = context.getCounter(BLUR_UPDATE_DEBUG, MULTIPLE_RECORD_W_SAME_RECORD_ID);

  _debugMarkerRecordsNoUpdate = context.getCounter(BLUR_UPDATE_DEBUG, MARKER_RECORDS + SEP + NO_UPDATE);
  _debugMarkerRecordsUpdate = context.getCounter(BLUR_UPDATE_DEBUG, MARKER_RECORDS + SEP + UPDATE);
  _debugIndexValues = context.getCounter(BLUR_UPDATE_DEBUG, INDEX_VALUES);
  _debugNullBlurRecords = context.getCounter(BLUR_UPDATE_DEBUG, NULL_BLUR_RECORDS);
}
 

protected static void updateCounters(ScanMetrics scanMetrics, long numScannerRestarts,
    Method getCounter, TaskAttemptContext context, long numStale) {
  // we can get access to counters only if hbase uses new mapreduce APIs
  if (getCounter == null) {
    return;
  }

  try {
    for (Map.Entry<String, Long> entry:scanMetrics.getMetricsMap().entrySet()) {
      Counter ct = (Counter)getCounter.invoke(context,
          HBASE_COUNTER_GROUP_NAME, entry.getKey());

      ct.increment(entry.getValue());
    }
    ((Counter) getCounter.invoke(context, HBASE_COUNTER_GROUP_NAME,
        "NUM_SCANNER_RESTARTS")).increment(numScannerRestarts);
    ((Counter) getCounter.invoke(context, HBASE_COUNTER_GROUP_NAME,
        "NUM_SCAN_RESULTS_STALE")).increment(numStale);
  } catch (Exception e) {
    LOG.debug("can't update counter." + StringUtils.stringifyException(e));
  }
}
 

/**
 * Construct from another counters object.
 * @param <C1> type of the other counter
 * @param <G1> type of the other counter group
 * @param counters the counters object to copy
 * @param groupFactory the factory for new groups
 */
@InterfaceAudience.Private
public <C1 extends Counter, G1 extends CounterGroupBase<C1>>
AbstractCounters(AbstractCounters<C1, G1> counters,
                 CounterGroupFactory<C, G> groupFactory) {
  this.groupFactory = groupFactory;
  for(G1 group: counters) {
    String name = group.getName();
    G newGroup = groupFactory.newGroup(name, group.getDisplayName(), limits);
    (isFrameworkGroup(name) ? fgroups : groups).put(name, newGroup);
    for(Counter counter: group) {
      newGroup.addCounter(counter.getName(), counter.getDisplayName(),
                          counter.getValue());
    }
  }
}
 

public static long run(String collection, Path input, Path output,
		Configuration baseConf) throws IOException, ClassNotFoundException,
		InterruptedException {
	Configuration conf = new Configuration(baseConf);
	Job job = Job.getInstance(conf);

	job.setJarByClass(OnlineFeatureDriver.class);
	job.setJobName("GROUP each record's feature BY identifier");

	FileInputFormat.setInputPaths(job, input);
	FileOutputFormat.setOutputPath(job, output);

	job.setInputFormatClass(SequenceFileInputFormat.class);
	job.setOutputFormatClass(SequenceFileOutputFormat.class);

	job.setMapOutputKeyClass(Text.class);
	job.setMapOutputValueClass(OnlineVectorWritable.class);
	job.setOutputKeyClass(Text.class);
	job.setOutputValueClass(ListWritable.class);

	job.setMapperClass(OnlineFeatureMapper.class);
	job.setReducerClass(OnlineFeatureReducer.class);

	HadoopUtil.delete(conf, output);
	boolean succeeded = job.waitForCompletion(true);
	if (!succeeded) {
		throw new IllegalStateException("Job:Group feature,  Failed!");
	}
	Counter counter = job.getCounters().findCounter(
			"org.apache.hadoop.mapred.Task$Counter",
			"REDUCE_OUTPUT_RECORDS");
	long reduceOutputRecords = counter.getValue();

	LOG.info(
			"Job: GROUP each record's feature BY identifier, output recordes = {}",
			reduceOutputRecords);

	return reduceOutputRecords;
}
 

@Override
@SuppressWarnings("unchecked")
public void incrAllCounters(CounterGroupBase<C> other) {
  if (checkNotNull(other.getUnderlyingGroup(), "other group")
      instanceof FileSystemCounterGroup<?>) {
    for (Counter counter : other) {
      FSCounter c = (FSCounter) ((Counter)counter).getUnderlyingCounter();
      findCounter(c.scheme, c.key) .increment(counter.getValue());
    }
  }
}
 

private void clearCounters() {
  for (Group g : countersToMetrics) {
    for (Counter c : g) {
      c.setValue(0);
    }
  }
}
 

private static long getRecordCountFromCounter(TaskAttemptContext context, Enum<?> counterName) {
  try {
    Method getCounterMethod = context.getClass().getMethod("getCounter", Enum.class);
    return ((Counter) getCounterMethod.invoke(context, counterName)).getValue();
  } catch (Exception e) {
    throw new RuntimeException("Error reading record count counter", e);
  }
}
 

public ReduceContextImpl(Configuration conf, TaskAttemptID taskid,
                         RawKeyValueIterator input, 
                         Counter inputKeyCounter,
                         Counter inputValueCounter,
                         RecordWriter<KEYOUT,VALUEOUT> output,
                         OutputCommitter committer,
                         StatusReporter reporter,
                         RawComparator<KEYIN> comparator,
                         Class<KEYIN> keyClass,
                         Class<VALUEIN> valueClass
                        ) throws InterruptedException, IOException{
  super(conf, taskid, output, committer, reporter);
  this.input = input;
  this.inputKeyCounter = inputKeyCounter;
  this.inputValueCounter = inputValueCounter;
  this.comparator = comparator;
  this.serializationFactory = new SerializationFactory(conf);
  this.keyDeserializer = serializationFactory.getDeserializer(keyClass);
  this.keyDeserializer.open(buffer);
  this.valueDeserializer = serializationFactory.getDeserializer(valueClass);
  this.valueDeserializer.open(buffer);
  hasMore = input.next();
  this.keyClass = keyClass;
  this.valueClass = valueClass;
  this.conf = conf;
  this.taskid = taskid;
}
 

@Override
public Counter getCounter(String group, String name) {
    try {
        return context.getCounter(group, name);
    } catch (NullPointerException npe) {
        return null;
    }
}
 

@Test
public void testMapper() throws IOException, InterruptedException {
    Configuration conf = new Configuration();
    // basic config
    conf.set("statsd.host", "localhost");
    conf.set("statsd.port", "8125");
    conf.set("mapreduce.job.queuename", "queue1");
    conf.set("mapreduce.job.name", "job1");
    // some valid aspect configs
    conf.set("statsd.final.gauge.MyGroup1", "CounterGroup1");
    conf.set("statsd.final.counter.MyGroup2", "CounterGroup2/Counter1");
    conf.set("statsd.live.time.MyGroup3.MyCounter2", "CounterGroup3/Counter2");
    conf.set("statsd.live.counter.TestGroup", TestCounters.class.getName());
    CounterToStatsDConfiguration config = new CounterToStatsDConfiguration(conf);
    
    TestStatsDEnabledMapper mapper = new TestStatsDEnabledMapper();
    
    Mapper.Context context = mapper.createTestContext(conf);
    
    mapper.setup(context);
    
    Assert.assertNotNull(mapper.getHelper());
    
    TaskAttemptContext returnedContext = mapper.getContext(context);
    Assert.assertEquals(CounterStatsDClient.class.getName() + '$' + "StatsDTaskAttemptContext", returnedContext.getClass().getName());
    
    Counter testCounter = mapper.getCounter(context, TestCounters.COUNTER1);
    Assert.assertEquals(CounterStatsDClient.class.getName() + '$' + "StatsDCounter", testCounter.getClass().getName());
    
    testCounter = mapper.getCounter(context, "CounterGroup1", "Counter1");
    Assert.assertEquals(CounterStatsDClient.class.getName() + '$' + "StatsDCounter", testCounter.getClass().getName());
    
    Assert.assertFalse(((CounterStatsDClientTest.TestCounterStatsDClient) (mapper.getHelper()).getClient()).stopped);
    mapper.cleanup(context);
    Assert.assertNull(mapper.getHelper().getClient());
}
 

@Override
public boolean incrCounter(String group, String name, long delta) {
    if (context == null) {
        return false;
    }
    Counter counter = context.getCounter(group, name);
    counter.increment(delta);
    return true;
}
 

/** {@inheritDoc} */
@Override public Counter addCounter(String name, String displayName, long value) {
    final Counter counter = cntrs.findCounter(this.name, name);

    counter.setValue(value);

    return counter;
}
 

@Override
public void map(ImmutableBytesWritable key, Result result, Context context) throws IOException, InterruptedException {
	Counter c = context.getCounter(DEFUALT_COUNTER_GROUP, DEFUALT_COUNTER_TOTAL);
	c.increment(1);

	LinkedHashMap<String, String> rowdata = new LinkedHashMap<>();
	rowdata.put("row", Bytes.toString(key.get()));

	Iterator<Cell> it = result.listCells().iterator();
	while (it.hasNext()) {
		Cell cell = it.next();
		byte[] qualifier = extractFieldByteArray(cell.getQualifierArray(), cell.getQualifierOffset(),
				cell.getQualifierLength());
		byte[] value = extractFieldByteArray(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
		String _qualifier = Bytes.toString(qualifier);
		if (!HbaseMigrateUtils.isIgnoreHbaseQualifier(_qualifier)) {
			rowdata.put(_qualifier, Bytes.toString(value));
		}
	}

	// Insert sql.
	try {
		String insertSql = SimpleHfileToRmdbExporter.currentRmdbManager.buildInsertSql(rowdata);
		if (SimpleHfileToRmdbExporter.verbose) {
			log.info(format("Inserting [%s]: %s", c.getValue(), insertSql));
		}
		SimpleHfileToRmdbExporter.currentRmdbManager.getRmdbRepository().saveRowdata(insertSql);
		context.getCounter(DEFUALT_COUNTER_GROUP, DEFUALT_COUNTER_PROCESSED).increment(1);
	} catch (Exception e) {
		log.error(e);
	}

}
 

public TaskCounterGroupInfo(String name, CounterGroup group) {
  this.counterGroupName = name;
  this.counter = new ArrayList<TaskCounterInfo>();

  for (Counter c : group) {
    TaskCounterInfo cinfo = new TaskCounterInfo(c.getName(), c.getValue());
    this.counter.add(cinfo);
  }
}
 

public CounterGroupInfo(String name, CounterGroup group, CounterGroup mg,
    CounterGroup rg) {
  this.counterGroupName = name;
  this.counter = new ArrayList<CounterInfo>();

  for (Counter c : group) {
    Counter mc = mg == null ? null : mg.findCounter(c.getName());
    Counter rc = rg == null ? null : rg.findCounter(c.getName());
    CounterInfo cinfo = new CounterInfo(c, mc, rc);
    this.counter.add(cinfo);
  }
}
 

private void updateProgressSplits() {
  double newProgress = reportedStatus.progress;
  newProgress = Math.max(Math.min(newProgress, 1.0D), 0.0D);
  Counters counters = reportedStatus.counters;
  if (counters == null)
    return;

  WrappedProgressSplitsBlock splitsBlock = getProgressSplitBlock();
  if (splitsBlock != null) {
    long now = clock.getTime();
    long start = getLaunchTime(); // TODO Ensure not 0

    if (start != 0 && now - start <= Integer.MAX_VALUE) {
      splitsBlock.getProgressWallclockTime().extend(newProgress,
          (int) (now - start));
    }

    Counter cpuCounter = counters.findCounter(TaskCounter.CPU_MILLISECONDS);
    if (cpuCounter != null && cpuCounter.getValue() <= Integer.MAX_VALUE) {
      splitsBlock.getProgressCPUTime().extend(newProgress,
          (int) cpuCounter.getValue()); // long to int? TODO: FIX. Same below
    }

    Counter virtualBytes = counters
      .findCounter(TaskCounter.VIRTUAL_MEMORY_BYTES);
    if (virtualBytes != null) {
      splitsBlock.getProgressVirtualMemoryKbytes().extend(newProgress,
          (int) (virtualBytes.getValue() / (MEMORY_SPLITS_RESOLUTION)));
    }

    Counter physicalBytes = counters
      .findCounter(TaskCounter.PHYSICAL_MEMORY_BYTES);
    if (physicalBytes != null) {
      splitsBlock.getProgressPhysicalMemoryKbytes().extend(newProgress,
          (int) (physicalBytes.getValue() / (MEMORY_SPLITS_RESOLUTION)));
    }
  }
}
 

private void updateProgressSplits() {
  double newProgress = reportedStatus.progress;
  newProgress = Math.max(Math.min(newProgress, 1.0D), 0.0D);
  Counters counters = reportedStatus.counters;
  if (counters == null)
    return;

  WrappedProgressSplitsBlock splitsBlock = getProgressSplitBlock();
  if (splitsBlock != null) {
    long now = clock.getTime();
    long start = getLaunchTime(); // TODO Ensure not 0

    if (start != 0 && now - start <= Integer.MAX_VALUE) {
      splitsBlock.getProgressWallclockTime().extend(newProgress,
          (int) (now - start));
    }

    Counter cpuCounter = counters.findCounter(TaskCounter.CPU_MILLISECONDS);
    if (cpuCounter != null && cpuCounter.getValue() <= Integer.MAX_VALUE) {
      splitsBlock.getProgressCPUTime().extend(newProgress,
          (int) cpuCounter.getValue()); // long to int? TODO: FIX. Same below
    }

    Counter virtualBytes = counters
      .findCounter(TaskCounter.VIRTUAL_MEMORY_BYTES);
    if (virtualBytes != null) {
      splitsBlock.getProgressVirtualMemoryKbytes().extend(newProgress,
          (int) (virtualBytes.getValue() / (MEMORY_SPLITS_RESOLUTION)));
    }

    Counter physicalBytes = counters
      .findCounter(TaskCounter.PHYSICAL_MEMORY_BYTES);
    if (physicalBytes != null) {
      splitsBlock.getProgressPhysicalMemoryKbytes().extend(newProgress,
          (int) (physicalBytes.getValue() / (MEMORY_SPLITS_RESOLUTION)));
    }
  }
}
 

private void setSummarySlotSeconds(JobSummary summary, Counters allCounters) {

    Counter slotMillisMapCounter = allCounters
      .findCounter(JobCounter.SLOTS_MILLIS_MAPS);
    if (slotMillisMapCounter != null) {
      summary.setMapSlotSeconds(slotMillisMapCounter.getValue() / 1000);
    }

    Counter slotMillisReduceCounter = allCounters
      .findCounter(JobCounter.SLOTS_MILLIS_REDUCES);
    if (slotMillisReduceCounter != null) {
      summary.setReduceSlotSeconds(slotMillisReduceCounter.getValue() / 1000);
    }
  }
 

private void updateCounter()
{
    long[] operatorTime = getOperatorTime();

    String profileCounterGroupName =
            PhaseContext.isMapper() ? mapperProfileCounterGroupName
                    : reducerProfileCounterGroupName;

    ArrayNode operatorsJson = multipassOperatorsJson.get(currentPassIndex);
    for (int i = 0; i < operatorTime.length; i++)
    {
        if (operatorTime[i] > 0)
        {
            JsonNode operatorJson = operatorsJson.get(i);

            OperatorType type =
                    OperatorType.valueOf(operatorJson.get("operator").getTextValue());
            String outputName = operatorJson.get("output").getTextValue();

            String counterName =
                    String.format("P%d-O%d-%s-%s",
                                  currentPassIndex,
                                  i,
                                  type,
                                  outputName);
            Counter profileCounter =
                    PhaseContext.getCounter(profileCounterGroupName, counterName);
            profileCounter.increment(operatorTime[i]);
        }
    }
}
 

@Override
public synchronized boolean equals(Object genericRight) {
  if (genericRight instanceof Counter) {
    synchronized (genericRight) {
      Counter right = (Counter) genericRight;
      return getName().equals(right.getName()) &&
             getDisplayName().equals(right.getDisplayName()) &&
             getValue() == right.getValue();
    }
  }
  return false;
}
 

/**
 * Make the pre 0.21 counter string (for e.g. old job history files)
 * [(actual-name)(display-name)(value)]
 * @param counter to stringify
 * @return the stringified result
 */
public static String toEscapedCompactString(Counter counter) {

  // First up, obtain the strings that need escaping. This will help us
  // determine the buffer length apriori.
  String escapedName, escapedDispName;
  long currentValue;
  synchronized(counter) {
    escapedName = escape(counter.getName());
    escapedDispName = escape(counter.getDisplayName());
    currentValue = counter.getValue();
  }
  int length = escapedName.length() + escapedDispName.length() + 4;


  length += 8; // For the following delimiting characters
  StringBuilder builder = new StringBuilder(length);
  builder.append(COUNTER_OPEN);

  // Add the counter name
  builder.append(UNIT_OPEN);
  builder.append(escapedName);
  builder.append(UNIT_CLOSE);

  // Add the display name
  builder.append(UNIT_OPEN);
  builder.append(escapedDispName);
  builder.append(UNIT_CLOSE);

  // Add the value
  builder.append(UNIT_OPEN);
  builder.append(currentValue);
  builder.append(UNIT_CLOSE);

  builder.append(COUNTER_CLOSE);

  return builder.toString();
}
 

/**
 * FrameworkGroup ::= #counter (key value)*
 */
@Override
@SuppressWarnings("unchecked")
public void write(DataOutput out) throws IOException {
  WritableUtils.writeVInt(out, size());
  for (int i = 0; i < counters.length; ++i) {
    Counter counter = (C) counters[i];
    if (counter != null) {
      WritableUtils.writeVInt(out, i);
      WritableUtils.writeVLong(out, counter.getValue());
    }
  }
}
 

@Override
public Counter getCounter(Enum<?> counterName) {
    throw new NotImplementedException();
}
 

public Counter getBadLineCount() {
  return badLineCount;
}
 

@Override
public Counter getCounter(Enum<?> counterName) {
  return base.getCounter(counterName);
}
 

@Override
public Counter getCounter(final Enum<?> counterName) {
  return context.getCounter(counterName);
}