| /* |
| * 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.spark |
| |
| import org.apache.spark.annotation.DeveloperApi |
| |
| /** |
| * :: DeveloperApi :: |
| * A TaskContext aware iterator. |
| * |
| * As the Python evaluation consumes the parent iterator in a separate thread, |
| * it could consume more data from the parent even after the task ends and the parent is closed. |
| * If an off-heap access exists in the parent iterator, it could cause segmentation fault |
| * which crashes the executor. |
| * Thus, we should use [[ContextAwareIterator]] to stop consuming after the task ends. |
| */ |
| @DeveloperApi |
| class ContextAwareIterator[+T](val context: TaskContext, val delegate: Iterator[T]) |
| extends Iterator[T] { |
| |
| override def hasNext: Boolean = |
| !context.isCompleted() && !context.isInterrupted() && delegate.hasNext |
| |
| override def next(): T = delegate.next() |
| } |
