zentol commented on a change in pull request #8498: [FLINK-12413] [runtime] Implement ExecutionFailureHandler URL: https://github.com/apache/flink/pull/8498#discussion_r287788041
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/failover/flip1/ExecutionFailureHandler.java ########## @@ -0,0 +1,76 @@ +/* + * 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.executiongraph.failover.flip1; + +import org.apache.flink.runtime.JobException; +import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID; +import org.apache.flink.runtime.throwable.ThrowableClassifier; +import org.apache.flink.runtime.throwable.ThrowableType; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * This handler deals with task failures to return a {@link FailureHandlingResult} which contains tasks + * to restart to recover from failures. + */ +public class ExecutionFailureHandler { + + /** Strategy to judge which tasks should be restarted. */ + private final FailoverStrategy failoverStrategy; + + /** Strategy to judge whether and when a restarting should be done. */ + private final RestartBackoffTimeStrategy restartBackoffTimeStrategy; + + /** + * Creates the handler to deal with task failures. + * + * @param failoverStrategy helps to decide tasks to restart on task failures + * @param restartBackoffTimeStrategy helps to decide whether to restart failed tasks and the restarting delay + */ + public ExecutionFailureHandler( + FailoverStrategy failoverStrategy, + RestartBackoffTimeStrategy restartBackoffTimeStrategy) { + + this.failoverStrategy = checkNotNull(failoverStrategy); + this.restartBackoffTimeStrategy = checkNotNull(restartBackoffTimeStrategy); + } + + /** + * Return result of failure handling. Can be a set of task vertices to restart + * and a delay of the restarting. Or that the failure is not recoverable and the reason for it. + * + * @param failedTask is the ID of the failed task vertex + * @param cause of the task failure + * @return result of the failure handling + */ + public FailureHandlingResult getFailureHandlingResult(ExecutionVertexID failedTask, Throwable cause) { + if (ThrowableClassifier.getThrowableType(cause) == ThrowableType.NonRecoverableError) { Review comment: according to the [scheduler interface draft](https://docs.google.com/document/d/1fstkML72YBO1tGD_dmG2rwvd9bklhRVauh4FSsDDwXU/edit#), the `RestartBackoffTimeStrategy` is responsible for this decision. ```The delay is computed by a RestartBackoffTimeStrategy that is also responsible for deciding whether a restart should be performed at all (e.g., if the failure cause is SuppressRestartsException).``` ---------------------------------------------------------------- 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: [email protected] With regards, Apache Git Services
