dajac commented on a change in pull request #8933: URL: https://github.com/apache/kafka/pull/8933#discussion_r456279196
########## File path: core/src/main/scala/kafka/server/ControllerMutationQuotaManager.scala ########## @@ -0,0 +1,205 @@ +/** + * 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 kafka.server + +import kafka.network.RequestChannel +import kafka.network.RequestChannel.Session +import org.apache.kafka.common.MetricName +import org.apache.kafka.common.errors.ThrottlingQuotaExceededException +import org.apache.kafka.common.metrics.Metrics +import org.apache.kafka.common.metrics.QuotaViolationException +import org.apache.kafka.common.metrics.Sensor +import org.apache.kafka.common.metrics.Sensor.QuotaEnforcementType +import org.apache.kafka.common.protocol.Errors +import org.apache.kafka.common.utils.Time +import org.apache.kafka.server.quota.ClientQuotaCallback + +import scala.jdk.CollectionConverters._ + +/** + * The ControllerMutationQuota trait defines a quota for a given user/clientId pair. Such + * quota is not meant to be cached forever but rather during the lifetime of processing + * a request. + */ +trait ControllerMutationQuota { + def isExceeded: Boolean + def accept(permits: Double): Unit + def throttleTime: Int +} + +/** + * Default quota used when quota is disabled. + */ +object UnboundedControllerMutationQuota extends ControllerMutationQuota { + override def isExceeded: Boolean = false + override def accept(permits: Double): Unit = () + override def throttleTime: Int = 0 +} + +/** + * The StrictControllerMutationQuota defines a strict quota for a given user/clientId pair. The + * quota is strict meaning that it does not accept any mutations once the quota is exhausted until + * it gets back to the defined rate. + * + * @param time @Time object to use + * @param quotaSensor @Sensor object with a defined quota for a given user/clientId pair + */ +class StrictControllerMutationQuota(private val time: Time, + private val quotaSensor: Sensor) extends ControllerMutationQuota { + + private var lastThrottleTimeMs = 0L + private var lastRecordedTimeMs = 0L Review comment: That is correct. They are basically updated every time `record` (formally `accept`) is called if the quota is violated. We keep only the last one because it gives the fresher information about how long is required to bring back the average rate to the quota. ---------------------------------------------------------------- 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
