io.trino.plugin.hudi.split.HudiBackgroundSplitLoader Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of trino-hudi Show documentation
Trino - Hudi connector
There is a newer version: 465
/*
 * Licensed 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 io.trino.plugin.hudi.split;

import com.google.common.util.concurrent.Futures;
import io.trino.plugin.hive.util.AsyncQueue;
import io.trino.plugin.hudi.HudiTableHandle;
import io.trino.plugin.hudi.partition.HudiPartitionInfoLoader;
import io.trino.plugin.hudi.query.HudiDirectoryLister;
import io.trino.spi.TrinoException;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.connector.ConnectorSplit;

import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;

import static io.trino.plugin.hudi.HudiErrorCode.HUDI_CANNOT_OPEN_SPLIT;
import static io.trino.plugin.hudi.HudiSessionProperties.getSplitGeneratorParallelism;
import static java.util.Objects.requireNonNull;

public class HudiBackgroundSplitLoader
        implements Runnable
{
    private final HudiDirectoryLister hudiDirectoryLister;
    private final AsyncQueue asyncQueue;
    private final Executor splitGeneratorExecutor;
    private final int splitGeneratorNumThreads;
    private final HudiSplitFactory hudiSplitFactory;
    private final List partitions;

    public HudiBackgroundSplitLoader(
            ConnectorSession session,
            HudiTableHandle tableHandle,
            HudiDirectoryLister hudiDirectoryLister,
            AsyncQueue asyncQueue,
            Executor splitGeneratorExecutor,
            HudiSplitWeightProvider hudiSplitWeightProvider,
            List partitions)
    {
        this.hudiDirectoryLister = requireNonNull(hudiDirectoryLister, "hudiDirectoryLister is null");
        this.asyncQueue = requireNonNull(asyncQueue, "asyncQueue is null");
        this.splitGeneratorExecutor = requireNonNull(splitGeneratorExecutor, "splitGeneratorExecutorService is null");
        this.splitGeneratorNumThreads = getSplitGeneratorParallelism(session);
        this.hudiSplitFactory = new HudiSplitFactory(tableHandle, hudiSplitWeightProvider);
        this.partitions = requireNonNull(partitions, "partitions is null");
    }

    @Override
    public void run()
    {
        Deque partitionQueue = new ConcurrentLinkedDeque<>(partitions);
        List splitGeneratorList = new ArrayList<>();
        List splitGeneratorFutures = new ArrayList<>();

        // Start a number of partition split generators to generate the splits in parallel
        for (int i = 0; i < splitGeneratorNumThreads; i++) {
            HudiPartitionInfoLoader generator = new HudiPartitionInfoLoader(hudiDirectoryLister, hudiSplitFactory, asyncQueue, partitionQueue);
            splitGeneratorList.add(generator);
            splitGeneratorFutures.add(Futures.submit(generator, splitGeneratorExecutor));
        }

        for (HudiPartitionInfoLoader generator : splitGeneratorList) {
            // Let the split generator stop once the partition queue is empty
            generator.stopRunning();
        }

        // Wait for all split generators to finish
        for (Future future : splitGeneratorFutures) {
            try {
                future.get();
            }
            catch (InterruptedException | ExecutionException e) {
                throw new TrinoException(HUDI_CANNOT_OPEN_SPLIT, "Error generating Hudi split", e);
            }
        }
        asyncQueue.finish();
    }
}