HuangZhenQiu commented on a change in pull request #8952: URL: https://github.com/apache/flink/pull/8952#discussion_r548939312
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/failurerate/TimestampBasedFailureRater.java ########## @@ -0,0 +1,93 @@ +/* + * 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.runtime.failurerate; + +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.time.Time; +import org.apache.flink.runtime.execution.ThresholdExceedException; + +import java.util.ArrayDeque; +import java.util.Queue; +import java.util.function.Supplier; + +/** + * A timestamp queue based failure rater implementation. + */ +public class TimestampBasedFailureRater implements ThresholdMeter { + private static final Double MILLISECONDS_PER_SECOND = 1000.0; + private final Supplier<Long> currentTimeMillisSupplier; + private final double maximumFailureRate; + private final Time failureInterval; + private final Queue<Long> failureTimestamps; + private long failureCounter = 0; + + public TimestampBasedFailureRater(double maximumFailureRate, Time failureInterval) { + this(maximumFailureRate, failureInterval, System::currentTimeMillis); + } + + @VisibleForTesting + public TimestampBasedFailureRater(double maximumFailureRate, Time failureInterval, Supplier<Long> customSupplier) { + this.maximumFailureRate = maximumFailureRate; + this.failureInterval = failureInterval; + this.failureTimestamps = new ArrayDeque<>(); + this.currentTimeMillisSupplier = customSupplier; + } + + @Override + public void markEvent() { + failureTimestamps.add(System.currentTimeMillis()); + failureCounter++; + } + + @Override + public void markEvent(long n) { + for (int i = 0; i < n; i++) { + failureTimestamps.add(System.currentTimeMillis()); + } + failureCounter = failureCounter + n; + } + + @Override + public double getRate() { + return getCurrentFailureRate() / (failureInterval.toMilliseconds() / MILLISECONDS_PER_SECOND); + } + + @Override + public long getCount() { + return failureCounter; + } + + @Override + public void checkAgainstThreshold() throws ThresholdExceedException { + if (getCurrentFailureRate() >= maximumFailureRate) { Review comment: Updated. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
