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Configuration.java
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Configuration.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.unsafe.impl.batchimport;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.kernel.configuration.Config;
import static java.lang.Long.parseLong;
import static java.lang.Math.min;
import static org.neo4j.io.ByteUnit.mebiBytes;
/**
* User controlled configuration for a {@link BatchImporter}.
*/
public interface Configuration extends org.neo4j.unsafe.impl.batchimport.staging.Configuration
{
/**
* File name in which bad entries from the import will end up. This file will be created in the
* database directory of the imported database, i.e. <into>/bad.log.
*/
String BAD_FILE_NAME = "bad.log";
/**
* @return number of relationships threshold for considering a node dense.
*/
int denseNodeThreshold();
/**
* @return amount of memory to reserve for the page cache. This should just be "enough" for it to be able
* to sequentially read and write a couple of stores at a time. If configured too high then there will
* be less memory available for other caches which are critical during the import. Optimal size is
* estimated to be 100-200 MiB. The importer will figure out an optimal page size from this value,
* with slightly bigger page size than "normal" random access use cases.
*/
long pageCacheMemory();
class Default
extends org.neo4j.unsafe.impl.batchimport.staging.Configuration.Default
implements Configuration
{
@Override
public long pageCacheMemory()
{
long upperBound = parseLong( GraphDatabaseSettings.pagecache_memory.getDefaultValue() );
// Get the upper bound of what we can get from the default config calculation
// We even want to limit amount of memory a bit more since we don't need very much during import
return min( mebiBytes( 240 ), upperBound );
}
@Override
public int denseNodeThreshold()
{
return Integer.parseInt( GraphDatabaseSettings.dense_node_threshold.getDefaultValue() );
}
}
Configuration DEFAULT = new Default();
class Overridden
extends org.neo4j.unsafe.impl.batchimport.staging.Configuration.Overridden
implements Configuration
{
private final Configuration defaults;
private final Config config;
public Overridden( Configuration defaults, Config config )
{
super( defaults );
this.defaults = defaults;
this.config = config;
}
public Overridden( Config config )
{
this( Configuration.DEFAULT, config );
}
@Override
public long pageCacheMemory()
{
return defaults.pageCacheMemory();
}
@Override
public int denseNodeThreshold()
{
return config.get( GraphDatabaseSettings.dense_node_threshold );
}
@Override
public int movingAverageSize()
{
return defaults.movingAverageSize();
}
}
}