org.elasticsearch.index.codec.postingsformat.Elasticsearch090PostingsFormat Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.index.codec.postingsformat;
import org.apache.lucene.codecs.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.TermsConsumer;
import org.apache.lucene.codecs.lucene41.Lucene41PostingsFormat;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
import org.elasticsearch.common.util.BloomFilter;
import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat.BloomFilteredFieldsConsumer;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import java.io.IOException;
/**
* This is the default postings format for Elasticsearch that special cases
* the _uid field to use a bloom filter while all other fields
* will use a {@link Lucene41PostingsFormat}. This format will reuse the underlying
* {@link Lucene41PostingsFormat} and its files also for the _uid saving up to
* 5 files per segment in the default case.
*/
public final class Elasticsearch090PostingsFormat extends PostingsFormat {
private final BloomFilterPostingsFormat bloomPostings;
public Elasticsearch090PostingsFormat() {
super("es090");
bloomPostings = new BloomFilterPostingsFormat(new Lucene41PostingsFormat(), BloomFilter.Factory.DEFAULT);
}
public PostingsFormat getDefaultWrapped() {
return bloomPostings.getDelegate();
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
final BloomFilteredFieldsConsumer fieldsConsumer = bloomPostings.fieldsConsumer(state);
return new FieldsConsumer() {
@Override
public void close() throws IOException {
fieldsConsumer.close();
}
@Override
public TermsConsumer addField(FieldInfo field) throws IOException {
if (UidFieldMapper.NAME.equals(field.name)) {
// only go through bloom for the UID field
return fieldsConsumer.addField(field);
}
return fieldsConsumer.getDelegate().addField(field);
}
};
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
// we can just return the delegate here since we didn't record bloom filters for
// the other fields.
return bloomPostings.fieldsProducer(state);
}
}