dclim commented on a change in pull request #7428: Add errors and state to stream supervisor status API endpoint URL: https://github.com/apache/incubator-druid/pull/7428#discussion_r278351993
########## File path: indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/SeekableStreamSupervisorStateManager.java ########## @@ -0,0 +1,386 @@ +/* + * 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.druid.indexing.seekablestream.supervisor; + +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.annotation.JsonPropertyOrder; +import com.google.common.base.Optional; +import com.google.common.base.Preconditions; +import com.google.common.collect.ImmutableSet; +import org.apache.druid.indexer.TaskState; +import org.apache.druid.indexing.seekablestream.SeekableStreamSupervisorConfig; +import org.apache.druid.indexing.seekablestream.exceptions.NonTransientStreamException; +import org.apache.druid.indexing.seekablestream.exceptions.PossiblyTransientStreamException; +import org.apache.druid.indexing.seekablestream.exceptions.TransientStreamException; +import org.apache.druid.java.util.common.DateTimes; +import org.apache.druid.utils.CircularBuffer; +import org.codehaus.plexus.util.ExceptionUtils; +import org.joda.time.DateTime; + +import java.util.HashSet; +import java.util.Map; +import java.util.Queue; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentLinkedQueue; + +public class SeekableStreamSupervisorStateManager +{ + public enum State + { + // Error states are ordered from high to low priority + UNHEALTHY_SUPERVISOR(1), + UNHEALTHY_TASKS(2), + UNABLE_TO_CONNECT_TO_STREAM(3), + LOST_CONTACT_WITH_STREAM(4), + // Non-error states are equal priority + WAITING_TO_RUN(5), + CONNECTING_TO_STREAM(5), + DISCOVERING_INITIAL_TASKS(5), + CREATING_TASKS(5), + RUNNING(5), + SUSPENDED(5), + SHUTTING_DOWN(5); + + // Lower priority number means higher priority and vice versa + private final int priority; + + State(int priority) + { + this.priority = priority; + } + + // We only want to set these if the supervisor hasn't had a successful iteration yet + public boolean isOnlySetWhenNoSuccessfulRunYet() + { + Set<State> firstRunStates = ImmutableSet.of( + WAITING_TO_RUN, + CONNECTING_TO_STREAM, + DISCOVERING_INITIAL_TASKS, + CREATING_TASKS, + RUNNING + ); + return firstRunStates.contains(this); + } + + public boolean isHealthy() + { + Set<State> unhealthyStates = ImmutableSet.of( + UNHEALTHY_SUPERVISOR, + UNHEALTHY_TASKS, + UNABLE_TO_CONNECT_TO_STREAM, + LOST_CONTACT_WITH_STREAM + ); + return !unhealthyStates.contains(this); + } + } + + public enum StreamErrorTransience + { + TRANSIENT, + POSSIBLY_TRANSIENT, + NON_TRANSIENT, + NON_STREAM_ERROR + } + + private State supervisorState; + private final int healthinessThreshold; + private final int unhealthinessThreshold; + private final int healthinessTaskThreshold; + private final int unhealthinessTaskThreshold; + + private boolean atLeastOneSuccessfulRun = false; + private boolean currentRunSuccessful = true; + private final CircularBuffer<TaskState> completedTaskHistory; + private final CircularBuffer<State> supervisorStateHistory; // From previous runs + private final ExceptionEventStore eventStore; + + public SeekableStreamSupervisorStateManager( + State initialState, + SeekableStreamSupervisorConfig supervisorConfig + ) + { + this.supervisorState = initialState; + this.healthinessThreshold = supervisorConfig.getHealthinessThreshold(); + this.unhealthinessThreshold = supervisorConfig.getUnhealthinessThreshold(); + this.healthinessTaskThreshold = supervisorConfig.getTaskHealthinessThreshold(); + this.unhealthinessTaskThreshold = supervisorConfig.getTaskUnhealthinessThreshold(); + Preconditions.checkArgument( + supervisorConfig.getMaxStoredExceptionEvents() >= + Math.max(healthinessThreshold, unhealthinessThreshold), + "numExceptionEventsToStore must be greater than or equal to both " + + "healthinessThreshold and unhealthinessThreshold" + ); + this.eventStore = new ExceptionEventStore( + supervisorConfig.getMaxStoredExceptionEvents(), + supervisorConfig.isStoringStackTraces() + ); + this.completedTaskHistory = new CircularBuffer<>(Math.max(healthinessTaskThreshold, unhealthinessTaskThreshold)); + this.supervisorStateHistory = new CircularBuffer<>(Math.max(healthinessThreshold, unhealthinessThreshold)); + } + + /** + * Certain supervisor states can only be set if the supervisor hasn't had a successful iteration yet. This function + * checks if there's been at least one successful iteration if needed and sets supervisor state to an appropriate + * new state. + */ + public Optional<State> setState(State newState) + { + if (newState.isOnlySetWhenNoSuccessfulRunYet()) { + if (!atLeastOneSuccessfulRun) { + supervisorState = newState; + return Optional.of(newState); + } else { + return Optional.absent(); + } + } else if (newState.equals(State.SUSPENDED)) { + atLeastOneSuccessfulRun = false; // We want the startup states again after being suspended + } + this.supervisorState = newState; + return Optional.of(newState); + } + + public void storeThrowableEvent(Throwable t) + { + if (t instanceof PossiblyTransientStreamException && atLeastOneSuccessfulRun) { + t = new TransientStreamException(t); Review comment: How about wrap the underlying exception instead of wrapping `PossiblyTransientStreamException` in a `TransientStreamException`? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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