Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/5207#discussion_r160128690
--- Diff:
flink-clients/src/main/java/org/apache/flink/client/program/rest/retry/ExponentialWaitStrategy.java
---
@@ -0,0 +1,45 @@
+/*
+ * 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.flink.client.program.rest.retry;
+
+import static org.apache.flink.util.Preconditions.checkArgument;
+
+/**
+ * {@link WaitStrategy} with exponentially increasing sleep time.
+ */
+public class ExponentialWaitStrategy implements WaitStrategy {
+
+ private final long initialWait;
+
+ private final long maxWait;
+
+ public ExponentialWaitStrategy(final long initialWait, final long
maxWait) {
+ checkArgument(initialWait > 0, "initialWait must be positive,
was %s", initialWait);
+ checkArgument(maxWait > 0, "maxWait must be positive, was %s",
maxWait);
+ this.initialWait = initialWait;
+ this.maxWait = maxWait;
+ }
+
+ @Override
+ public long sleepTime(final long attempt) {
+ final long exponentialSleepTime = initialWait *
Math.round(Math.pow(2, attempt));
--- End diff --
`Math.pow(2, attempt)` could also be calculated cheaper with a bit shift
operation.
---
