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Reduces peak memory required by importer
by separating import logic so that IdMapper and NodeRelationshipCache aren't used at the same time. For this to work one additional stage is introduced before relationship linking that goes through the imported relationship records and counts node degrees. Typically this separation reduces the peak memory usage by 40%. main author: @SRaghuram
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community/kernel/src/main/java/org/neo4j/unsafe/impl/batchimport/NodeDegreeCountStage.java
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/* | |||
* Copyright (c) 2002-2017 "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; | |||
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import static org.neo4j.unsafe.impl.batchimport.RecordIdIterator.forwards; | |||
import static org.neo4j.unsafe.impl.batchimport.staging.Step.ORDER_SEND_DOWNSTREAM; | |||
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import org.neo4j.kernel.impl.store.RelationshipStore; | |||
import org.neo4j.unsafe.impl.batchimport.cache.NodeRelationshipCache; | |||
import org.neo4j.unsafe.impl.batchimport.staging.BatchFeedStep; | |||
import org.neo4j.unsafe.impl.batchimport.staging.ReadRecordsStep; | |||
import org.neo4j.unsafe.impl.batchimport.staging.Stage; | |||
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/** | |||
* Goes through {@link RelationshipStore} and increments counts per start/end node, | |||
* calling {@link NodeRelationshipCache#incrementCount(long)}. This is in preparation of linking relationships. | |||
*/ | |||
public class NodeDegreeCountStage extends Stage | |||
{ | |||
public NodeDegreeCountStage( Configuration config, RelationshipStore store, NodeRelationshipCache cache ) | |||
{ | |||
super( "Node Degrees", config, ORDER_SEND_DOWNSTREAM ); | |||
add( new BatchFeedStep( control(), config, forwards( 0, store.getHighId(), config ), store.getRecordSize()) ); | |||
add( new ReadRecordsStep<>( control(), config, false, store, null ) ); | |||
add( new CalculateDenseNodesStep( control(), config, cache ) ); | |||
} | |||
} |
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