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From GitBox <...@apache.org>
Subject [GitHub] ivankelly commented on a change in pull request #2883: Add healthcheck for broker
Date Tue, 30 Oct 2018 13:55:46 GMT
ivankelly commented on a change in pull request #2883: Add healthcheck for broker
URL: https://github.com/apache/pulsar/pull/2883#discussion_r229315227
 
 

 ##########
 File path: pulsar-broker/src/main/java/org/apache/pulsar/PulsarHealthcheck.java
 ##########
 @@ -0,0 +1,204 @@
+/**
+ * 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.pulsar;
+
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.Parameter;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.file.Paths;
+
+import java.util.Map;
+import java.util.HashMap;
+
+import java.util.Properties;
+import java.util.UUID;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import org.apache.commons.lang3.StringUtils;
+
+import org.apache.pulsar.client.admin.PulsarAdmin;
+import org.apache.pulsar.client.admin.PulsarAdminBuilder;
+import org.apache.pulsar.client.api.ClientBuilder;
+import org.apache.pulsar.client.api.Consumer;
+import org.apache.pulsar.client.api.Message;
+import org.apache.pulsar.client.api.Producer;
+import org.apache.pulsar.client.api.PulsarClient;
+import org.apache.pulsar.client.api.Schema;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+public class PulsarHealthcheck {
+    private static final Logger log = LoggerFactory.getLogger(PulsarHealthcheck.class);
+
+    private static class HealthcheckArguments {
+        @Parameter(names = {"-c", "--clientConf"}, description = "Configuration file for
healthcheck")
+        private String healthcheckConf = Paths.get("").toAbsolutePath().normalize().toString()
+ "/conf/client.conf";
+
+        @Parameter(names = {"-t", "--timeout"}, description = "Max number of seconds to wait
for the healthcheck")
+        private int timeoutSeconds = 10;
+
+        @Parameter(names = {"-h", "--help"}, description = "Show this help message")
+        private boolean help = false;
+    }
+
+    private static class Healthcheck implements Callable<Void> {
+        private final Properties properties;
+
+        Healthcheck(Properties properties) {
+            this.properties = properties;
+        }
+
+        @Override
+        public Void call() throws Exception {
+            log.info("Running healthcheck");
+            try (PulsarAdmin admin = propsToAdminBuilder(properties).build()) {
+                String topic = String.format("persistent://%s/healthcheck",
+                                             admin.brokers().getInternalConfigurationData().getHeartbeatNamespace());
+                log.info("Subscribing to topic {}", topic);
+                try (PulsarClient client = propsToClientBuilder(properties).build();
+                     Producer<String> producer = client.newProducer(Schema.STRING).topic(topic).create();
+                     Consumer<String> consumer = client.newConsumer(Schema.STRING)
 
 Review comment:
   I was actually thinking of removing the subscribe for other reasons overnight. A subscribe
is a couple of ZK writes, and unsubscribe likewise (ledger creation/deletion, metadata updates).
If healthchecking is doing 4x writes per probe and you have a lot of  brokers, that a significant
bump in zk writes. 
   
   Will change to reader.

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