flink metric对接openTSDB背景方案代码

背景

    Flink 任务有着丰富监控指标，但是Flink原生(1.10)支持的Reporter只有JMXReporter、GraphiteReporter、InfluxdbReporter、PrometheusReporter、StatsDReporter、DatadogHttpReporter、Slf4jReporter这些Reporter，但是我们公司的监控系统后端使用的是openTSDB，如何把我们的flink任务的metric 接入到我们的监控系统，最后通过grafana展示，成了我们的一个要解决的问题。

方案

    虽然Flink原生不支持openTSDB的Reporter，但是Flink支持我们自定义reporter，只要继承AbstractReporter类并且实现Scheduled接口，就可以实现我们自己的reporter了，将flink任务的metric对接到我们各自的监控系统。
    我们在实现自己的reporter的时候，希望多加几个功能，一个是批量发送，因为和openTSDB交互是通过http进行的，所以希望通过批量发送提高发送效率。另外一个是flink metric还挺多的，我们考虑到openTSDB承受能力，希望加入白名单和黑名单机制。

代码

openTSDBReporter

public class openTSDBReporter extends AbstractReporter implements Scheduled {
    private static String TSDB_URL;
    private static int Batch_SIZE;
    private static int Batch_TIMEOUT;
    private static String WHITELIST;
    private static List <String> tagBlackList = new ArrayList<>();
    private ArrayList<String> whitePrefixList = new ArrayList<>();

    private static final Logger log = LoggerFactory.getLogger(openTSDBRepoter.class);
    private long timestamp = System.currentTimeMillis() / 1000L;

    private ArrayList <openTSDBentity> entityBuffer = new ArrayList<>();
    private JSONArray  cmaEntityBuffer = new JSONArray();

    public void open(MetricConfig metricConfig) {
        TSDB_URL = metricConfig.getString("url", "disable");
        Batch_SIZE = metricConfig.getInteger("batch_size", 20);
        Batch_TIMEOUT = metricConfig.getInteger("batch_timeout", 30);
        WHITELIST = metricConfig.getString("whitelist", "none")
                +",flink.operator.commitsSucceeded,flink.operator.commitsFailed";

        whitePrefixList.add("flink.operator."+metricConfig.getString("whitePrefix", "jj."));
        whitePrefixList.add("flink.operator.KafkaConsumer.topic");
        whitePrefixList.add("flink.tm");
        whitePrefixList.add("flink.jm");
        whitePrefixList.add("flink.task");
        tagBlackList.add("tm_id");
        tagBlackList.add("task_name");
    }

    public void close() {
    }

    public String filterCharacters(String s) {
        return s;
    }

    public void report() {
        for (Map.Entry <Counter, String> metric : counters.entrySet()) {
            String metricTagString = metric.getValue();
            Object value = metric.getKey().getCount();
            generateMetricEntity(metricTagString, value);
        }

        for (Map.Entry <Gauge <?>, String> metric : gauges.entrySet()) {
            String metricTagString = metric.getValue();
            Object value = metric.getKey().getValue();
            generateMetricEntity(metricTagString, value);
        }

        for (Map.Entry <Meter, String> metric : meters.entrySet()) {
            String metricTagString = metric.getValue();
            Object value = metric.getKey().getRate();
            generateMetricEntity(metricTagString, value);
        }

        for (Map.Entry <Histogram, String> metric : histograms.entrySet()) {
            HistogramStatistics stats = metric.getKey().getStatistics();
            String metricTagString = metric.getValue();
            Object valueMean = stats.getMean();
            generateMetricEntity(metricTagString, valueMean,"mean");
            Object valueMin = stats.getMin();
            generateMetricEntity(metricTagString, valueMin,"min");
            Object valueMax = stats.getMax();
            generateMetricEntity(metricTagString, valueMax,"max");
            Object value99 = stats.getQuantile(0.99);
            generateMetricEntity(metricTagString, value99,"p99");
        }
    }

    private void send(String metricName, long metricTs, Object metricValue, HashMap <String, String> tagMap) {
        long now = System.currentTimeMillis() / 1000L;
        boolean match = Pattern.matches("^(\+|-)?\d+($|\.\d+$)",String.valueOf(metricValue));
        if(!match){
            return;
        }
        //openTSDB buffer
        if(!"disable".equals(TSDB_URL)) {
            openTSDBentity opentsdbEntity = new openTSDBentity(metricName, metricTs, metricValue, tagMap);
            entityBuffer.add(opentsdbEntity);
            if ((entityBuffer.size() >= Batch_SIZE) || (now - timestamp >= Batch_TIMEOUT)) {
                try {
                    httpClient.doPost(TSDB_URL, JSON.toJSONString(entityBuffer));
                } catch (Exception e) {
                    log.error(e.getLocalizedMessage());
                    System.out.println("send metrics to openTSDB failure:" + e.getMessage());
                }
                entityBuffer.clear();
            }
        }
        timestamp = now;
    }

    private void generateMetricEntity(String metricTagString, Object value,String suffix) {

        String metricName = metricTagString.substring(metricTagString.indexOf("~flink") + 1);
        String realMetricName;
        if(suffix==null){
            realMetricName = metricName.replaceAll(" |\~", ".");
        }else {
            realMetricName = metricName.replaceAll(" |\~", ".")+"."+suffix;
        }
        String[] tagArray = metricTagString
                .substring(0, metricTagString.indexOf("~flink"))
                .split("~");

        if (WHITELIST.startsWith("all")
                ||stringStartWithArrayList(whitePrefixList,realMetricName)
                ||WHITELIST.contains(realMetricName)) {
            HashMap <String, String> innerTagMap = new HashMap<>();
            for (int i = 0; i < tagArray.length; i += 2) {
                String s = tagArray[(i + 1)].replaceAll(">| ", "").replaceAll(":", "--");
                if(!tagBlackList.contains(tagArray[i])) {
                    innerTagMap.put(tagArray[i], s);
                }
            }
            //解决kafka connector metric的问题
            if(realMetricName.startsWith("flink.operator.KafkaConsumer")) {
                if (realMetricName.endsWith("committedOffsets")
                        || realMetricName.endsWith("currentOffsets")) {
                    String ktpTag = realMetricName.substring(realMetricName.indexOf("KafkaConsumer.") + 14, realMetricName.lastIndexOf("."));
                    innerTagMap.put("topic", ktpTag.split("\.")[1]);
                    innerTagMap.put("partition", ktpTag.split("\.")[3]);
                    realMetricName = "flink.operator.KafkaConsumer" + realMetricName.substring(realMetricName.lastIndexOf(".") + 1);
                }
            }

            if (value instanceof JSONArray) {
                JSONArray jsonArrayValues = (JSONArray) value;
                for (int i = 0; i < jsonArrayValues.size(); i++) {
                    HashMap <String, String> fullTagMap = new HashMap <>(innerTagMap);
                    JSONObject singleMetric = jsonArrayValues.getJSONObject(i);
                    JSONArray tags = singleMetric.getJSONArray("tags");
                    Object realMetricValue = singleMetric.get("value");
                    for(int j = 0; j < tags.size(); j++){
                        JSONObject tag =tags.getJSONObject(j);
                        fullTagMap.put(tag.getString("tagK"),tag.getString("tagV"));
                    }
                    send(realMetricName, timestamp, realMetricValue, fullTagMap);
                }
            } else {
                send(realMetricName, timestamp, value, innerTagMap);
            }
        }
    }

    private void generateMetricEntity(String metricTagString, Object value) {
        this.generateMetricEntity(metricTagString,value,null);
    }

    private boolean stringStartWithArrayList(ArrayList<String> list,String s){
        for(String a:list){
            if(s.startsWith(a)){
               return true;
            }
        }
        return false;
    }
}

openTSDBentity

import java.util.HashMap;

public class openTSDBentity {
    private String metric;
    private long timestamp;
    private Object value;
    private HashMap<String,String> tags;

    public openTSDBentity(String metric, long timestamp, Object value, HashMap <String, String> tags) {
        this.metric = metric;
        this.timestamp = timestamp;
        this.value = value;
        this.tags = tags;
    }

    public String getMetric() {
        return metric;
    }

    public void setMetric(String metric) {
        this.metric = metric;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public Object getValue() {
        return value;
    }

    public void setValue(Object value) {
        this.value = value;
    }

    public HashMap <String, String> getTags() {
        return tags;
    }

    public void setTags(HashMap <String, String> tags) {
        this.tags = tags;
    }
}

httpClient

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.*;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import static org.apache.http.HttpVersion.HTTP;


public class httpClient {
    private static SSLConnectionSocketFactory sslsf = null;
    private static PoolingHttpClientConnectionManager cm = null;
    private static SSLContextBuilder builder = null;
    private static final Logger log = LoggerFactory.getLogger(httpClient.class);

    static {
        try {
            builder = new SSLContextBuilder();
            // 全部信任 不做身份鉴定
            builder.loadTrustMaterial(null, (TrustStrategy) (x509Certificates, s) -> true);
            sslsf = new SSLConnectionSocketFactory(builder.build(), new String[]{"SSLv2Hello", "SSLv3", "TLSv1", "TLSv1.2"}, null, NoopHostnameVerifier.INSTANCE);
            Registry <ConnectionSocketFactory> registry = RegistryBuilder. <ConnectionSocketFactory>create()
                    .register(HTTP, new PlainConnectionSocketFactory())
                    .register("https", sslsf)
                    .build();
            cm = new PoolingHttpClientConnectionManager(registry);
            cm.setMaxTotal(200);//max connection
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static CloseableHttpClient getHttpClient() {
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(sslsf)
                .setConnectionManager(cm)
                .setConnectionManagerShared(true)
                .build();
        return httpClient;
    }

    public static String doPost(String url, String json) throws Exception {
        CloseableHttpClient httpclient = HttpClientBuilder.create().build();
        HttpPost httppost = new HttpPost(url);
        String result = getStatus(httpclient, httppost, new StringEntity(json, "UTF-8"));
        httpclient.close();
        if(result.contains("err_code")){
            log.debug(url+"=="+json);
//            System.out.println(url+"=="+json);
        }
        return result;
    }

    private static String getStatus(CloseableHttpClient httpclient, HttpEntityEnclosingRequestBase req, HttpEntity requestEntity) throws Exception {
        req.setEntity(requestEntity);
        req.setHeader("Content-Type","application/json");
        HttpResponse response = httpclient.execute(req);

        int code = response.getStatusLine().getStatusCode();
        if (String.valueOf(code).startsWith("2")) {
            HttpEntity entity = response.getEntity();
            String result = "";
            if (entity != null)
                result = EntityUtils.toString(entity, "UTF-8");
            return result;
        } else {
            return "{"err_code":"" + code+ ""}";
        }
    }
}

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