Help Center/ MapReduce Service/ Developer Guide (Normal_Earlier Than 3.x)/ OpenTSDB Application Development/ Application Development/ Writing Data
Updated on 2022-09-14 GMT+08:00
View PDF

Writing Data

Function Description

You can use the OpenTSDB API (/api/put) to write data.

Function genWeatherData () simulates the generated weather data. The function putData() sends weather data to the OpenTSDB server.

Sample Code

The following code snippets are in the putData method of the OpentsdbExample class in the com.huawei.bigdata.opentsdb.examples packet. 
private void putData(String tmpURL) {
  PUT_URL = BASE_URL + tmpURL;
  LOG.info("start to put data in opentsdb, the url is " + PUT_URL);
  try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
    HttpPost httpPost = new HttpPost(PUT_URL);//A timeout interval must be set for the request.
    addTimeout(httpPost);
    String weatherData = genWeatherData();
    StringEntity entity = new StringEntity(weatherData, "ISO-8859-1");
    entity.setContentType("application/json");
    httpPost.setEntity(entity);
    HttpResponse response = httpClient.execute(httpPost);
    int statusCode = response.getStatusLine().getStatusCode();
    LOG.info("Status Code : " + statusCode);
    if (statusCode != HttpStatus.SC_NO_CONTENT) {
      LOG.info("Request failed! " + response.getStatusLine());
    }
    LOG.info("put data to opentsdb successfully.");
  } catch (IOException e) {
    LOG.error("Failed to put data.", e);
  }
}

static class DataPoint {
  public String metric;
  public Long timestamp;
  public Double value;
  public Map<String, String> tags;
  public DataPoint(String metric, Long timestamp, Double value, Map<String, String> tags) {
    this.metric = metric;
    this.timestamp = timestamp;
    this.value = value;
    this.tags = tags;
  }
}

private String genWeatherData() {
  List<DataPoint> dataPoints = new ArrayList<DataPoint>();
  Map<String, String> tags = ImmutableMap.of("city", "Shenzhen", "region", "Longgang");

  // Data of air temperature
  dataPoints.add(new DataPoint("city.temp", 1498838400L, 28.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498842000L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498845600L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498849200L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498852800L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498856400L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498860000L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498863600L, 27.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498867200L, 29.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498870800L, 30.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498874400L, 32.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498878000L, 32.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498881600L, 33.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498885200L, 33.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498888800L, 32.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498892400L, 32.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498896000L, 31.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498899600L, 30.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498903200L, 30.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498906800L, 29.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498910400L, 29.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498914000L, 29.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498917600L, 28.0, tags));
  dataPoints.add(new DataPoint("city.temp", 1498921200L, 28.0, tags));

  // Data of humidity
  dataPoints.add(new DataPoint("city.hum", 1498838400L, 54.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498842000L, 53.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498845600L, 52.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498849200L, 51.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498852800L, 50.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498856400L, 49.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498860000L, 48.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498863600L, 46.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498867200L, 46.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498870800L, 48.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498874400L, 48.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498878000L, 49.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498881600L, 49.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498885200L, 50.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498888800L, 50.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498892400L, 50.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498896000L, 51.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498899600L, 51.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498903200L, 51.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498906800L, 51.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498910400L, 52.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498914000L, 53.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498917600L, 54.0, tags));
  dataPoints.add(new DataPoint("city.hum", 1498921200L, 54.0, tags));

  Gson gson = new Gson();
  return gson.toJson(dataPoints);
}

The sync parameter is added to PUT_URL, indicating that data can be returned only after data is written to HBase. This parameter is strongly recommended. If sync is not used, data is asynchronously written to HBase, which may cause data loss. For details, see OpenTSDB APIs.

Parent topic: Application Development