[GitHub] [kylin] shaofengshi commented on a change in pull request #1152: KYLIN-4413: add canary tool

[GitBox <gi...@apache.org>]

shaofengshi commented on a change in pull request #1152: KYLIN-4413: add canary tool
URL: https://github.com/apache/kylin/pull/1152#discussion_r390771814
 
 

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 File path: tool/src/main/java/org/apache/kylin/tool/KylinCanary.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kylin.tool;
+
+
+import org.apache.commons.cli.Options;
+import org.apache.commons.configuration.SubsetConfiguration;
+import org.apache.hadoop.metrics2.MetricsRecord;
+import org.apache.hadoop.metrics2.MetricsSink;
+import org.apache.hadoop.metrics2.MetricsSystem;
+import org.apache.hadoop.metrics2.annotation.Metric;
+import org.apache.hadoop.metrics2.annotation.Metrics;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
+import org.apache.hadoop.metrics2.lib.MutableGaugeLong;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.entity.ContentType;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.util.EntityUtils;
+import org.apache.kylin.common.KylinConfig;
+import org.apache.kylin.common.util.AbstractApplication;
+import org.apache.kylin.common.util.OptionsHelper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+public class KylinCanary extends AbstractApplication {
+    private static final Logger logger = LoggerFactory.getLogger(KylinCanary.class);
+
+    private static final int HTTP_CONNECTION_TIMEOUT = 3000;
+    private static final int HTTP_READ_TIMEOUT = 30000;
+
+    private MetricsSink sink;
+    private KylinConfig config;
+    private long interval;
+    private String token;
+    private CanaryMetrics canaryMetrics;
+    private MetricsSystem metricsSystem;
+
+    @Metrics(name = "canary", about = "Canary metrics", context = "kylin")
+    public static class CanaryMetrics {
+        @Metric
+        MutableGaugeLong queryAvailability;
+
+        public CanaryMetrics() {
+        }
+
+        public void setQueryAvailability(long value) {
+            queryAvailability.set(value);
+        }
+    }
+
+    public KylinCanary() {
+        config = KylinConfig.getInstanceFromEnv();
+        token = config.getCanaryToken();
+
+        if (config.isCanaryDaemon()) {
+            interval = config.getCanaryInterval();
+        } else {
+            interval = -1;
+        }
+
+        canaryMetrics = new CanaryMetrics();
+        String sinkClassName = config.getCanarySinkClass();
+        try {
+            sink = (MetricsSink) Class.forName(sinkClassName).getConstructor().newInstance();
+        } catch (Exception e) {
+            logger.warn("new class: " + sinkClassName + " error.", e);
+            sink = new StdOutSink();
+        }
+        sink.init(null);
+
+        metricsSystem = DefaultMetricsSystem.instance();
+
+        metricsSystem.init("kylin-canary");
+        metricsSystem.register("kylin-canary", "Kylin Canary", canaryMetrics);
+        metricsSystem.register("falcon", "Falcon sink for xiaomi", sink);
+    }
+
+    @Override
+    protected Options getOptions() {
+        return new Options();
+    }
+
+    @Override
+    protected void execute(OptionsHelper optionsHelper) throws Exception {
+        if (interval > 0) {
+            while (true) {
+                runOnce();
+            }
+        } else {
+            runOnce();
+        }
+
+        metricsSystem.shutdown();
+    }
+
+    private void runOnce() throws InterruptedException {
+        long startTime = System.currentTimeMillis();
+
+        String[] servers = config.getRestServers();
+
+        // skip job server
+        // should use zookeeper info instead
+        int total = 0;
+        int failed = 0;
+        for (int i = 1; i < servers.length; i++) {
+            total++;
+            try {
+                checkQuery(servers[i]);
+            } catch (IOException e) {
+                failed++;
+                logger.warn("check failed with error, ", e);
+            }
+        }
+
+        double avail = 0.0;
+        if (total == 0){
+            avail = 1.0;
+        } else {
+            avail = 1.0 - (failed / total);
+        }
+        canaryMetrics.setQueryAvailability((long)(avail * 100));
+
+        metricsSystem.publishMetricsNow();
+
+        long finishTime = System.currentTimeMillis();
+        logger.info("Finish one turn, consume(ms)=" + (finishTime - startTime)
+                + ", interval(ms)=" + interval);
+        if (finishTime < startTime + interval) {
+            Thread.sleep(startTime + interval - finishTime);
+        }
+    }
+
+    private HttpResponse makeHttpRequest(String url, String postContent) throws IOException {
+        HttpParams httpParams = new BasicHttpParams();
+        HttpConnectionParams.setConnectionTimeout(httpParams, HTTP_CONNECTION_TIMEOUT);
+        HttpConnectionParams.setSoTimeout(httpParams, HTTP_READ_TIMEOUT);
+        DefaultHttpClient httpClient = new DefaultHttpClient(httpParams);
+
+        HttpPost httpPost = new HttpPost(url);
+        StringEntity requestEntity = new StringEntity(postContent, ContentType.APPLICATION_JSON);
+        httpPost.setEntity(requestEntity);
+        httpPost.addHeader("Authorization", "Basic " + token);
+
+        HttpResponse response = httpClient.execute(httpPost);
+
+        return response;
+    }
+
+    private long checkQuery(String host) throws IOException {
+        long startTime = System.currentTimeMillis();
+        String url = "http://" + host + "/kylin/api/query";
+
+        HttpResponse response = makeHttpRequest(url,
+                "{\"sql\": \"SELECT 1\",\"project\": \"KYLIN_SYSTEM\"}");
 
 Review comment:
   The project "KYLIN_SYSTEM" may not exist ?

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