tombentley commented on a change in pull request #9441: URL: https://github.com/apache/kafka/pull/9441#discussion_r625802963
########## File path: core/src/main/scala/kafka/server/KafkaApis.scala ########## @@ -279,30 +279,33 @@ class KafkaApis(val requestChannel: RequestChannel, new StopReplicaResponseData().setErrorCode(Errors.STALE_BROKER_EPOCH.code))) } else { val partitionStates = stopReplicaRequest.partitionStates().asScala - val (result, error) = replicaManager.stopReplicas( - request.context.correlationId, - stopReplicaRequest.controllerId, - stopReplicaRequest.controllerEpoch, - stopReplicaRequest.brokerEpoch, - partitionStates) - // Clear the coordinator caches in case we were the leader. In the case of a reassignment, we - // cannot rely on the LeaderAndIsr API for this since it is only sent to active replicas. - result.forKeyValue { (topicPartition, error) => - if (error == Errors.NONE) { - if (topicPartition.topic == GROUP_METADATA_TOPIC_NAME - && partitionStates(topicPartition).deletePartition) { - groupCoordinator.onResignation(topicPartition.partition) - } else if (topicPartition.topic == TRANSACTION_STATE_TOPIC_NAME - && partitionStates(topicPartition).deletePartition) { + def onStopReplicas(error: Errors, partitions: Map[TopicPartition, Errors]): Unit = { + // Clear the coordinator caches in case we were the leader. In the case of a reassignment, we + // cannot rely on the LeaderAndIsr API for this since it is only sent to active replicas. + partitions.forKeyValue { (topicPartition, partitionError) => + if (partitionError == Errors.NONE) { val partitionState = partitionStates(topicPartition) val leaderEpoch = if (partitionState.leaderEpoch >= 0) - Some(partitionState.leaderEpoch) + Some(partitionState.leaderEpoch) else None - txnCoordinator.onResignation(topicPartition.partition, coordinatorEpoch = leaderEpoch) + if (topicPartition.topic == GROUP_METADATA_TOPIC_NAME + && partitionState.deletePartition) { + groupCoordinator.onResignation(topicPartition.partition, leaderEpoch) + } else if (topicPartition.topic == TRANSACTION_STATE_TOPIC_NAME + && partitionState.deletePartition) { + txnCoordinator.onResignation(topicPartition.partition, coordinatorEpoch = leaderEpoch) + } } } } + val (result, error) = replicaManager.stopReplicas( + request.context.correlationId, + stopReplicaRequest.controllerId, + stopReplicaRequest.controllerEpoch, + stopReplicaRequest.brokerEpoch, + partitionStates, + onStopReplicas) Review comment: @guozhangwang yes, that's right. I forgot about our conversation about the lock when @hachikuji asked about why we were using the callback :disappointed:. I notice that the `partitionLock` is acquired by the `addLoadingPartition` call in `loadGroupsAndOffsets`, and is also acquired in `removeGroupsAndOffsets`. Wouldn't it be simpler to use that than `replicaStateChangeLock` at this point if we're wanting to avoid a third way of handling concurrency here, or is there some subtlety? Obviously we wouldn't hold it for the call to `doLoadGroupsAndOffsets` in `loadGroupsAndOffsets`, just for the two checks at the start ``` if (!maybeUpdateCoordinatorEpoch(topicPartition.partition, Some(coordinatorEpoch))) { info(s"Not loading offsets and group metadata for $topicPartition " + s"in epoch $coordinatorEpoch since current epoch is ${epochForPartitionId.get(topicPartition.partition)}") } else if (!addLoadingPartition(topicPartition.partition)) { info(s"Already loading offsets and group metadata from $topicPartition") } ``` -- 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