cadonna commented on code in PR #12128: URL: https://github.com/apache/kafka/pull/12128#discussion_r879819649
########## streams/src/main/java/org/apache/kafka/streams/processor/internals/DefaultStateUpdater.java: ########## @@ -0,0 +1,373 @@ +/* + * 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.kafka.streams.processor.internals; + +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.apache.kafka.streams.errors.StreamsException; +import org.apache.kafka.streams.errors.TaskCorruptedException; +import org.apache.kafka.streams.processor.TaskId; +import org.apache.kafka.streams.processor.internals.Task.State; +import org.slf4j.Logger; + +import java.time.Duration; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Queue; +import java.util.Set; +import java.util.concurrent.BlockingQueue; +import java.util.concurrent.LinkedBlockingQueue; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import java.util.stream.Collectors; + +public class DefaultStateUpdater implements StateUpdater { + + private final static String BUG_ERROR_MESSAGE = "This indicates a bug. " + + "Please report at https://issues.apache.org/jira/projects/KAFKA/issues or to the dev-mailing list (https://kafka.apache.org/contact)."; + + private class StateUpdaterThread extends Thread { + + private final ChangelogReader changelogReader; + private final AtomicBoolean isRunning = new AtomicBoolean(true); + private final java.util.function.Consumer<Set<TopicPartition>> offsetResetter; + private final Map<TaskId, Task> updatingTasks = new HashMap<>(); + private final Logger log; + + public StateUpdaterThread(final String name, + final ChangelogReader changelogReader, + final java.util.function.Consumer<Set<TopicPartition>> offsetResetter) { + super(name); + this.changelogReader = changelogReader; + this.offsetResetter = offsetResetter; + + final String logPrefix = String.format("%s ", name); + final LogContext logContext = new LogContext(logPrefix); + log = logContext.logger(DefaultStateUpdater.class); + } + + public Collection<Task> getAllUpdatingTasks() { + return updatingTasks.values(); + } + + @Override + public void run() { + try { + while (isRunning.get()) { + try { + performActionsOnTasks(); + restoreTasks(); + waitIfAllChangelogsCompletelyRead(); + } catch (final InterruptedException interruptedException) { + return; + } + } + } catch (final RuntimeException anyOtherException) { + log.error("An unexpected error occurred within the state updater thread: " + anyOtherException); + final ExceptionAndTasks exceptionAndTasks = new ExceptionAndTasks(new HashSet<>(updatingTasks.values()), anyOtherException); + updatingTasks.clear(); + failedTasks.add(exceptionAndTasks); + isRunning.set(false); + } finally { + clear(); + } + } + + private void performActionsOnTasks() throws InterruptedException { + tasksAndActionsLock.lock(); + try { + for (final TaskAndAction taskAndAction : getTasksAndActions()) { + final Task task = taskAndAction.task; + final Action action = taskAndAction.action; + switch (action) { + case ADD: + addTask(task); + break; + } + } + } finally { + tasksAndActionsLock.unlock(); + } + } + + private void restoreTasks() throws InterruptedException { + try { + // ToDo: Prioritize restoration of active tasks over standby tasks + // changelogReader.enforceRestoreActive(); + changelogReader.restore(updatingTasks); + } catch (final TaskCorruptedException taskCorruptedException) { + handleTaskCorruptedException(taskCorruptedException); + } catch (final StreamsException streamsException) { + handleStreamsException(streamsException); + } + final Set<TopicPartition> completedChangelogs = changelogReader.completedChangelogs(); + final List<Task> activeTasks = updatingTasks.values().stream().filter(Task::isActive).collect(Collectors.toList()); + for (final Task task : activeTasks) { + endRestorationIfChangelogsCompletelyRead(task, completedChangelogs); Review Comment: Good point! -- 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. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
