spark ContinuousPartitionReader 源码
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();
}
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