spark ContinuousPartitionReader 源码

  • 2022-10-20
  • 浏览 (216)

spark ContinuousPartitionReader 代码

文件路径:/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/streaming/ContinuousPartitionReader.java

/*
 * 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.sql.connector.read.streaming;

import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.read.PartitionReader;

/**
 * A variation on {@link PartitionReader} for use with continuous streaming processing.
 *
 * @since 3.0.0
 */
@Evolving
public interface ContinuousPartitionReader<T> extends PartitionReader<T> {

  /**
   * Get the offset of the current record, or the start offset if no records have been read.
   * <p>
   * The execution engine will call this method along with get() to keep track of the current
   * offset. When an epoch ends, the offset of the previous record in each partition will be saved
   * as a restart checkpoint.
   */
  PartitionOffset getOffset();
}

相关信息

spark 源码目录

相关文章

spark CompositeReadLimit 源码

spark ContinuousPartitionReaderFactory 源码

spark ContinuousStream 源码

spark MicroBatchStream 源码

spark Offset 源码

spark PartitionOffset 源码

spark ReadAllAvailable 源码

spark ReadLimit 源码

spark ReadMaxFiles 源码

spark ReadMaxRows 源码

0  赞