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IndexWriterConfigs.java
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IndexWriterConfigs.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.impl.index;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.LogByteSizeMergePolicy;
import org.neo4j.index.impl.lucene.legacy.LuceneDataSource;
import org.neo4j.index.impl.lucene.legacy.MultipleBackupDeletionPolicy;
import org.neo4j.unsafe.impl.internal.dragons.FeatureToggles;
public final class IndexWriterConfigs
{
private static final int MAX_BUFFERED_DOCS =
FeatureToggles.getInteger( IndexWriterConfigs.class, "max_buffered_docs", 100000 );
private static final int MERGE_POLICY_MERGE_FACTOR =
FeatureToggles.getInteger( IndexWriterConfigs.class, "merge.factor", 2 );
private static final double MERGE_POLICY_NO_CFS_RATIO =
FeatureToggles.getDouble( IndexWriterConfigs.class, "nocfs.ratio", 1.0 );
private static final double MERGE_POLICY_MIN_MERGE_MB =
FeatureToggles.getDouble( IndexWriterConfigs.class, "min.merge", 0.1 );
private IndexWriterConfigs()
{
throw new AssertionError( "Not for instantiation!" );
}
public static IndexWriterConfig standardConfig()
{
IndexWriterConfig writerConfig = new IndexWriterConfig( LuceneDataSource.KEYWORD_ANALYZER );
writerConfig.setMaxBufferedDocs( MAX_BUFFERED_DOCS ); // TODO figure out depending on environment?
writerConfig.setIndexDeletionPolicy( new MultipleBackupDeletionPolicy() );
writerConfig.setUseCompoundFile( true );
// TODO: TieredMergePolicy & possibly SortingMergePolicy
LogByteSizeMergePolicy mergePolicy = new LogByteSizeMergePolicy();
mergePolicy.setNoCFSRatio( MERGE_POLICY_NO_CFS_RATIO );
mergePolicy.setMinMergeMB( MERGE_POLICY_MIN_MERGE_MB );
mergePolicy.setMergeFactor( MERGE_POLICY_MERGE_FACTOR );
writerConfig.setMergePolicy( mergePolicy );
return writerConfig;
}
}