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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.
*/
package org.apache.hudi.utilities.sources;
import org.apache.hudi.common.config.TypedProperties;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.utilities.schema.SchemaProvider;
import org.apache.hudi.utilities.sources.helpers.DFSPathSelector;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
/**
* DFS Source that reads parquet data.
*/
public class ParquetDFSSource extends RowSource {
private final DFSPathSelector pathSelector;
public ParquetDFSSource(TypedProperties props, JavaSparkContext sparkContext, SparkSession sparkSession,
SchemaProvider schemaProvider) {
super(props, sparkContext, sparkSession, schemaProvider);
this.pathSelector = DFSPathSelector.createSourceSelector(props, this.sparkContext.hadoopConfiguration());
}
@Override
public Pair<Option<Dataset<Row>>, String> fetchNextBatch(Option<String> lastCkptStr, long sourceLimit) {
Pair<Option<String>, String> selectPathsWithMaxModificationTime =
pathSelector.getNextFilePathsAndMaxModificationTime(lastCkptStr, sourceLimit);
return selectPathsWithMaxModificationTime.getLeft()
.map(pathStr -> Pair.of(Option.of(fromFiles(pathStr)), selectPathsWithMaxModificationTime.getRight()))
.orElseGet(() -> Pair.of(Option.empty(), selectPathsWithMaxModificationTime.getRight()));
}
private Dataset<Row> fromFiles(String pathStr) {
return sparkSession.read().parquet(pathStr.split(","));
}
}