Examples of org.apache.hadoop.metrics2.MetricsExecutor

org.apache.hadoop.metrics2.MetricsRecord
ScheduledExecutorService for metrics.

      writer = filename == null
          ? new PrintWriter(System.out)
          : new PrintWriter(new FileWriter(new File(filename), true));
    }
    catch (Exception e) {
      throw new MetricsException("Error creating "+ filename, e);
    }
  }

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        try {
            // Open an connection to Graphite server.
            socket = new Socket(serverHost, serverPort);
            writer = new OutputStreamWriter(socket.getOutputStream());
        } catch (Exception e) {
            throw new MetricsException("Error creating connection, "
                    + serverHost + ":" + serverPort, e);
        }
    }

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        try {
            if(writer != null){
              writer.write(lines.toString());
            } else {
              throw new MetricsException("Writer in GraphiteSink is null!");
            }
        } catch (Exception e) {
            throw new MetricsException("Error sending metrics", e);
        }
    }

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    @Override
    public void flush() {
        try {
            writer.flush();
        } catch (Exception e) {
            throw new MetricsException("Error flushing metrics", e);
        }
    }

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      try {
        IOUtils.closeStream(writer);
        writer = null;
        LOG.info("writer in GraphiteSink is closed!");
      } catch (Throwable e){
        throw new MetricsException("Error closing writer", e);
      } finally {
        if (socket != null && !socket.isClosed()) {
          socket.close();
          socket = null;
          LOG.info("socket in GraphiteSink is closed!");

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  @Override public synchronized <T>
  T register(String name, String desc, T source) {
    MetricsSourceBuilder sb = MetricsAnnotations.newSourceBuilder(source);
    final MetricsSource s = sb.build();
    MetricsInfo si = sb.info();
    String name2 = name == null ? si.name() : name;
    final String finalDesc = desc == null ? si.description() : desc;
    final String finalName = // be friendly to non-metrics tests
        DefaultMetricsSystem.sourceName(name2, !monitoring);
    allSources.put(finalName, s);
    LOG.debug(finalName +", "+ finalDesc);
    if (monitoring) {

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    ms.shutdown();
  }


  private void checkMetricsRecords(List<MetricsRecord> recs) {
    LOG.debug(recs);
    MetricsRecord r = recs.get(0);
    assertEquals("name", "s1rec", r.name());
    assertEquals("tags", new MetricsTag[] {
      tag(MsInfo.Context, "test"),
      tag(MsInfo.Hostname, hostname)}, r.tags());
    assertEquals("metrics", MetricsLists.builder("")
      .addCounter(info("C1", "C1 desc"), 1L)
      .addGauge(info("G1", "G1 desc"), 2L)
      .addCounter(info("S1NumOps", "Number of ops for s1"), 1L)
      .addGauge(info("S1AvgTime", "Average time for s1"), 0.0)
      .metrics(), r.metrics());


    r = recs.get(1);
    assertTrue("NumActiveSinks should be 3", Iterables.contains(r.metrics(),
               new MetricGaugeInt(MsInfo.NumActiveSinks, 3)));
  }

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    tags.add(new MetricsTag(MsInfo.NumActiveSources, "foo"));
    tags.add(new MetricsTag(MsInfo.NumActiveSinks, "bar"));
    tags.add(new MetricsTag(MsInfo.NumAllSinks, "haa"));
    tags.add(new MetricsTag(MsInfo.Hostname, "host"));
    Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
    MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 1, tags, metrics);


    StringBuilder sb = new StringBuilder();
    sink.appendPrefix(record, sb);
    assertEquals(".NumActiveSources=foo.NumActiveSinks=bar.NumAllSinks=haa", sb.toString());

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        tags.add(new MetricsTag(MsInfo.Context, "all"));
        tags.add(new MetricsTag(MsInfo.Hostname, "host"));
        Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
        metrics.add(makeMetric("foo1", 1.25));
        metrics.add(makeMetric("foo2", 2.25));
        MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 10000, tags, metrics);


        OutputStreamWriter mockWriter = mock(OutputStreamWriter.class);
        ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);
        Whitebox.setInternalState(sink, "writer", mockWriter);
        sink.putMetrics(record);

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        tags.add(new MetricsTag(MsInfo.Context, "all"));
        tags.add(new MetricsTag(MsInfo.Hostname, null));
        Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
        metrics.add(makeMetric("foo1", 1));
        metrics.add(makeMetric("foo2", 2));
        MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 10000, tags, metrics);


        OutputStreamWriter mockWriter = mock(OutputStreamWriter.class);
        ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);
        Whitebox.setInternalState(sink, "writer", mockWriter);
        sink.putMetrics(record);

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