| // 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. |
| |
| using System; |
| using Org.Apache.REEF.Driver.Evaluator; |
| using Org.Apache.REEF.Tang.Annotations; |
| |
| namespace Org.Apache.REEF.Examples.AllHandlers |
| { |
| /// <summary> |
| /// A sample implementation of FailedEvaluatorHandler |
| /// </summary> |
| public class HelloFailedEvaluatorHandler : IObserver<IFailedEvaluator> |
| { |
| private static int _failureCount = 0; |
| |
| private static readonly int MaxTrial = 2; |
| |
| private readonly IEvaluatorRequestor _evaluatorRequestor; |
| |
| [Inject] |
| private HelloFailedEvaluatorHandler(IEvaluatorRequestor evaluatorRequestor) |
| { |
| _evaluatorRequestor = evaluatorRequestor; |
| } |
| |
| /// <summary> |
| /// Sample code to resubmit a request |
| /// </summary> |
| /// <param name="failedEvaluator"></param> |
| public void OnNext(IFailedEvaluator failedEvaluator) |
| { |
| Console.WriteLine("Receive a failed evaluator: " + failedEvaluator.Id); |
| if (++_failureCount < MaxTrial) |
| { |
| Console.WriteLine("Requesting another evaluator"); |
| var newRequest = |
| _evaluatorRequestor.NewBuilder().SetNumber(1).SetMegabytes(512).SetRackName("somerack").Build(); |
| _evaluatorRequestor.Submit(newRequest); |
| } |
| else |
| { |
| Console.WriteLine("Exceed max retries number"); |
| throw new Exception("Unrecoverable evaluator failure."); |
| } |
| } |
| |
| public void OnError(Exception error) |
| { |
| throw new NotImplementedException(); |
| } |
| |
| public void OnCompleted() |
| { |
| throw new NotImplementedException(); |
| } |
| } |
| } |