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[FLINK-9912][JM] Release TaskExecutors if they have no slots register…
…ed at SlotPool This commit extends the SlotPools behaviour when failing an allocation by sending a notification message to the TaskExecutor about the freed slot. Moreover, it checks whether the affected TaskExecutor has more slots registered or not. In the latter case, the TaskExecutor's connection will be eagerly closed. This closes apache#6394.
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flink-core/src/main/java/org/apache/flink/types/SerializableOptional.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.types; | ||
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| import javax.annotation.Nonnull; | ||
| import javax.annotation.Nullable; | ||
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| import java.io.Serializable; | ||
| import java.util.NoSuchElementException; | ||
| import java.util.Optional; | ||
| import java.util.function.Consumer; | ||
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| /** | ||
| * Serializable {@link Optional}. | ||
| */ | ||
| public final class SerializableOptional<T extends Serializable> implements Serializable { | ||
| private static final long serialVersionUID = -3312769593551775940L; | ||
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| private static final SerializableOptional<?> EMPTY = new SerializableOptional<>(null); | ||
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| @Nullable | ||
| private final T value; | ||
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| private SerializableOptional(@Nullable T value) { | ||
| this.value = value; | ||
| } | ||
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| public T get() { | ||
| if (value == null) { | ||
| throw new NoSuchElementException("No value present"); | ||
| } | ||
| return value; | ||
| } | ||
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| public boolean isPresent() { | ||
| return value != null; | ||
| } | ||
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| public void ifPresent(Consumer<? super T> consumer) { | ||
| if (value != null) { | ||
| consumer.accept(value); | ||
| } | ||
| } | ||
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| public static <T extends Serializable> SerializableOptional<T> of(@Nonnull T value) { | ||
| return new SerializableOptional<>(value); | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| public static <T extends Serializable> SerializableOptional<T> empty() { | ||
| return (SerializableOptional<T>) EMPTY; | ||
| } | ||
| } |
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