LuceneBatchIteratorBenchmark.java example

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 * to you under the Apache License, Version 2.0 (the "License"); you may
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package io.crate.operation.collect.collectors;

import io.crate.breaker.RamAccountingContext;
import io.crate.data.Input;
import io.crate.operation.reference.doc.lucene.CollectorContext;
import io.crate.operation.reference.doc.lucene.IntegerColumnReference;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.NumericDocValuesField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.store.RAMDirectory;
import org.elasticsearch.common.breaker.NoopCircuitBreaker;
import org.elasticsearch.index.fielddata.IndexFieldDataService;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static org.mockito.Mockito.mock;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
public class LuceneBatchIteratorBenchmark {

    public static final RamAccountingContext RAM_ACCOUNTING_CONTEXT = new RamAccountingContext("dummy", new NoopCircuitBreaker("dummy"));
    private CollectorContext collectorContext;
    private IndexSearcher indexSearcher;
    private List<IntegerColumnReference> columnRefs;

    @Setup
    public void createLuceneBatchIterator() throws Exception {
        IndexWriter iw = new IndexWriter(new RAMDirectory(), new IndexWriterConfig(new StandardAnalyzer()));
        String columnName = "x";
        for (int i = 0; i < 10_000_000; i++) {
            Document doc = new Document();
            doc.add(new NumericDocValuesField(columnName, i));
            iw.addDocument(doc);
        }
        iw.commit();
        iw.forceMerge(1, true);
        indexSearcher = new IndexSearcher(DirectoryReader.open(iw));
        IntegerColumnReference columnReference = new IntegerColumnReference(columnName);
        columnRefs = Collections.singletonList(columnReference);

        collectorContext = new CollectorContext(
            mock(IndexFieldDataService.class),
            new CollectorFieldsVisitor(0)
        );
    }

    @Benchmark
    public void measureConsumeLuceneBatchIterator(Blackhole blackhole) throws Exception {
        LuceneBatchIterator it = new LuceneBatchIterator(
            indexSearcher,
            new MatchAllDocsQuery(),
            null,
            false,
            collectorContext,
            RAM_ACCOUNTING_CONTEXT,
            columnRefs,
            columnRefs
        );

        Input<?> input = it.rowData().get(0);
        while (it.moveNext()) {
            blackhole.consume(input.value());
        }
    }
}