[GitHub] [pinot] richardstartin commented on a diff in pull request #8491: Add connection based FailureDetector

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

richardstartin commented on code in PR #8491:
URL: https://github.com/apache/pinot/pull/8491#discussion_r847746972


##########
pinot-broker/src/main/java/org/apache/pinot/broker/failuredetector/BaseExponentialBackoffRetryFailureDetector.java:
##########
@@ -0,0 +1,174 @@
+/**
+ * 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.pinot.broker.failuredetector;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.concurrent.ThreadSafe;
+import org.apache.pinot.common.metrics.BrokerGauge;
+import org.apache.pinot.common.metrics.BrokerMetrics;
+import org.apache.pinot.spi.env.PinotConfiguration;
+import org.apache.pinot.spi.utils.CommonConstants.Broker;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * The {@code BaseExponentialBackoffRetryFailureDetector} is a base failure detector implementation that retries the
+ * unhealthy servers with exponential increasing delays.
+ */
+@ThreadSafe
+public abstract class BaseExponentialBackoffRetryFailureDetector implements FailureDetector {
+  protected final Logger _logger = LoggerFactory.getLogger(getClass());
+  protected final String _name = getClass().getSimpleName();
+  protected final List<Listener> _listeners = new ArrayList<>();
+  protected final ConcurrentHashMap<String, RetryInfo> _unhealthyServerRetryInfoMap = new ConcurrentHashMap<>();
+
+  protected BrokerMetrics _brokerMetrics;
+  protected long _retryInitialDelayNs;
+  protected double _retryDelayFactor;
+  protected int _maxRetries;
+  protected Thread _retryThread;
+
+  protected volatile boolean _running;
+
+  @Override
+  public void init(PinotConfiguration config, BrokerMetrics brokerMetrics) {
+    _brokerMetrics = brokerMetrics;
+    long retryInitialDelayMs = config.getProperty(Broker.FailureDetector.CONFIG_OF_RETRY_INITIAL_DELAY_MS,
+        Broker.FailureDetector.DEFAULT_RETRY_INITIAL_DELAY_MS);
+    _retryInitialDelayNs = TimeUnit.MILLISECONDS.toNanos(retryInitialDelayMs);
+    _retryDelayFactor = config.getProperty(Broker.FailureDetector.CONFIG_OF_RETRY_DELAY_FACTOR,
+        Broker.FailureDetector.DEFAULT_RETRY_DELAY_FACTOR);
+    _maxRetries =
+        config.getProperty(Broker.FailureDetector.CONFIG_OF_MAX_RETRIES, Broker.FailureDetector.DEFAULT_MAX_RETIRES);
+    _logger.info("Initialized {} with retry initial delay: {}ms, exponential backoff factor: {}, max " + "retries: {}",
+        _name, retryInitialDelayMs, _retryDelayFactor, _maxRetries);
+  }
+
+  @Override
+  public void register(Listener listener) {
+    _listeners.add(listener);
+  }
+
+  @Override
+  public void start() {
+    _logger.info("Starting {}", _name);
+    _running = true;
+
+    _retryThread = new Thread(() -> {

Review Comment:
   Why don’t you use a single threaded ExecutorService here instead?



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