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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.drill.exec.physical.impl.partitionsender;
import java.io.IOException;
import java.util.List;
import org.apache.drill.exec.compile.TemplateClassDefinition;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.expr.ClassGenerator;
import org.apache.drill.exec.ops.ExchangeFragmentContext;
import org.apache.drill.exec.ops.OperatorContext;
import org.apache.drill.exec.ops.OperatorStats;
import org.apache.drill.exec.physical.config.HashPartitionSender;
import org.apache.drill.exec.record.RecordBatch;
public interface Partitioner {
// Keep the recordCount as (2^x) - 1 to better utilize the memory allocation in ValueVectors; however
// other criteria such as batch sizing in terms of actual MBytes rather than record count could also be applied
// by the operator.
int DEFAULT_RECORD_BATCH_SIZE = (1 << 10) - 1;
void setup(ExchangeFragmentContext context,
RecordBatch incoming,
HashPartitionSender popConfig,
OperatorStats stats,
OperatorContext oContext,
ClassGenerator<?> cg,
int start, int count) throws SchemaChangeException;
void partitionBatch(RecordBatch incoming) throws IOException;
void flushOutgoingBatches(boolean isLastBatch, boolean schemaChanged) throws IOException;
void initialize();
void clear();
List<? extends PartitionOutgoingBatch> getOutgoingBatches();
/**
* Method to get PartitionOutgoingBatch based on the fact that there can be > 1 Partitioner
* @param index
* @return PartitionOutgoingBatch that matches index within Partitioner. This method can
* return null if index does not fall within boundary of this Partitioner
*/
PartitionOutgoingBatch getOutgoingBatch(int index);
OperatorStats getStats();
TemplateClassDefinition<Partitioner> TEMPLATE_DEFINITION = new TemplateClassDefinition<>(Partitioner.class, PartitionerTemplate.class);
}
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