[GitHub] [hadoop] anujmodi2021 commented on a diff in pull request #5711: Hadoop-18759. [ABFS][Backoff-Optimization] Have a Linear retry policy for connection timeout.

["anujmodi2021 (via GitHub)" <gi...@apache.org>]

anujmodi2021 commented on code in PR #5711:
URL: https://github.com/apache/hadoop/pull/5711#discussion_r1217745638


##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/LinearRetryPolicy.java:
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@@ -0,0 +1,157 @@
+/**
+ * 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.hadoop.fs.azurebfs.services;
+
+import org.apache.hadoop.fs.azurebfs.AbfsConfiguration;
+import org.apache.hadoop.classification.VisibleForTesting;
+
+/**
+ * Linear Retry policy used by AbfsClient.
+ * */
+public class LinearRetryPolicy extends RetryPolicy{
+  
+  /**
+   * Represents the default maximum amount of time used when calculating the
+   * linear delay between retries.
+   */
+  private static final int DEFAULT_MAX_BACKOFF = 1000 * 30; // 30s
+
+  /**
+   * Represents the default minimum amount of time used when calculating the
+   * linear delay between retries.
+   */
+  private static final int DEFAULT_MIN_BACKOFF = 500 * 1; // 500ms
+
+  /**
+   * Represents the delta by which retry interval should be incremented
+   * for each retry count
+   */
+  private static final int INTERVAL_DELTA_ONE_SEND = 1000; // 1s
+
+  /**
+   * The maximum backoff time.
+   */
+  private final int maxBackoff;
+
+  /**
+   * The minimum backoff time.
+   */
+  private final int minBackoff;
+
+  /**
+   * The maximum number of retry attempts.
+   */
+  private final int retryCount;
+
+  /**
+   * Whether we want to double up the retry interval
+   * True: Double Up
+   * False: Increase by 1.
+   */
+  private final boolean doubleStepUpEnabled;
+
+  /**
+   * Initializes a new instance of the {@link LinearRetryPolicy} class.
+   */
+  public LinearRetryPolicy(final int maxIoRetries) {
+
+    this(maxIoRetries, DEFAULT_MIN_BACKOFF, DEFAULT_MAX_BACKOFF,
+        true);
+  }
+
+  /**
+   * Initializes a new instance of the {@link LinearRetryPolicy} class.
+   *
+   * @param conf The {@link AbfsConfiguration} from which to retrieve retry configuration.
+   */
+  public LinearRetryPolicy(AbfsConfiguration conf) {
+    this(conf.getMaxIoRetries(),
+        conf.getMinBackoffIntervalMillisecondsForConnectionTimeout(),
+        conf.getMaxBackoffIntervalMillisecondsForConnectionTimeout(),
+        conf.getLinearRetryDoubleStepUpEnabled());
+  }
+
+  /**
+   * Initializes a new instance of the {@link LinearRetryPolicy} class.
+   *
+   * @param retryCount The maximum number of retry attempts.
+   * @param minBackoff The minimum backoff time.
+   * @param maxBackoff The maximum backoff time.
+   * @param doubleStepUpEnabled Type of linear increment, double or increment
+   */
+  public LinearRetryPolicy(final int retryCount, final int minBackoff, final int maxBackoff, final boolean doubleStepUpEnabled) {
+    this.retryCount = retryCount;
+    this.minBackoff = minBackoff;
+    this.maxBackoff = maxBackoff;
+    this.doubleStepUpEnabled = doubleStepUpEnabled;
+  }
+
+  /**
+   * Returns if a request should be retried based on the retry count
+   *
+   * @param retryCount The current retry attempt count.
+   * @param statusCode The status code of last failed request
+   * @return true if the request should be retried; false otherwise.
+   */
+  public boolean shouldRetry(final int retryCount, final int statusCode) {
+    return retryCount < this.retryCount;
+  }
+
+  /**
+   * Returns backoff interval based on the type of linear backoff enabled
+   * if doubleStepUpEnabled, double the minBackoff retryCount times
+   * else, add 1000ms to minBackoff retryCount times
+   *
+   * @param retryCount The current retry attempt count.
+   * @return backoff Interval time
+   */
+  public long getRetryInterval(final int retryCount) {
+    if (retryCount <= 0)
+        return minBackoff;
+
+    final double incrementDelta = doubleStepUpEnabled

Review Comment:
   Math.pow() retrun double



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