org.elasticsearch.index.codec.postingsformat.ElasticSearch090PostingsFormat Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
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* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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
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*/
package org.elasticsearch.index.codec.postingsformat;
import java.io.IOException;
import java.util.Iterator;
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.apache.lucene.index.Terms;
import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat.BloomFilteredFieldsConsumer;
import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat.BloomFilteredFieldsProducer;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
/**
* 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 it's 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);
}
}