org.neo4j.kernel.impl.nioneo.store.MappedMemException: Unable to map pos=209715 recordSize=33 totalSize=629145
        at org.neo4j.kernel.impl.nioneo.store.MappedPersistenceWindow.<init>(MappedPersistenceWindow.java:61)
        at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.allocateNewWindow(PersistenceWindowPool.java:603)
        at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.refreshBricks(PersistenceWindowPool.java:501)
        at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.acquire(PersistenceWindowPool.java:128)
        at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.acquireWindow(CommonAbstractStore.java:526)
        at org.neo4j.kernel.impl.nioneo.store.RelationshipStore.getChainRecord(RelationshipStore.java:327)
        at org.neo4j.kernel.impl.nioneo.xa.ReadTransaction.getMoreRelationships(ReadTransaction.java:114)
        at org.neo4j.kernel.impl.nioneo.xa.ReadTransaction.getMoreRelationships(ReadTransaction.java:97)
        at org.neo4j.kernel.impl.persistence.PersistenceManager.getMoreRelationships(PersistenceManager.java:108)
        at org.neo4j.kernel.impl.core.NodeManager.getMoreRelationships(NodeManager.java:614)
        at org.neo4j.kernel.impl.core.NodeImpl.getMoreRelationships(NodeImpl.java:372)
        at org.neo4j.kernel.impl.core.NodeImpl.loadInitialRelationships(NodeImpl.java:335)
        at org.neo4j.kernel.impl.core.NodeImpl.ensureRelationshipMapNotNull(NodeImpl.java:322)
        at org.neo4j.kernel.impl.core.NodeImpl.getAllRelationshipsOfType(NodeImpl.java:168)
        at org.neo4j.kernel.impl.core.NodeImpl.getRelationships(NodeImpl.java:253)
        at org.neo4j.kernel.impl.core.NodeImpl.hasRelationship(NodeImpl.java:578)
        at org.neo4j.kernel.impl.core.NodeProxy.hasRelationship(NodeProxy.java:109)
        at GetLeafFromNodeWithEffNewMethod$1.isReturnableNode(GetLeafFromNodeWithEffNewMethod.java:56)
        at org.neo4j.kernel.impl.traversal.OldTraverserWrapper$Filter.accept(OldTraverserWrapper.java:272)
        at org.neo4j.kernel.impl.traversal.OldTraverserWrapper$Filter.accept(OldTraverserWrapper.java:259)
        at org.neo4j.kernel.impl.traversal.TraversalDescriptionImpl$WrappedFilter.evaluate(TraversalDescriptionImpl.java:254)
        at org.neo4j.kernel.impl.traversal.MultiEvaluator.evaluate(MultiEvaluator.java:41)
        at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.initialize(TraversalBranchImpl.java:122)
        at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.next(TraversalBranchImpl.java:141)
        at org.neo4j.kernel.PreorderDepthFirstSelector.next(PreorderDepthFirstSelector.java:48)
        at org.neo4j.kernel.impl.traversal.TraverserImpl$TraverserIterator.fetchNextOrNull(TraverserImpl.java:127)
        at org.neo4j.kernel.impl.traversal.TraverserImpl$TraverserIterator.fetchNextOrNull(TraverserImpl.java:94)
        at org.neo4j.helpers.collection.PrefetchingIterator.hasNext(PrefetchingIterator.java:55)
        at org.neo4j.kernel.impl.traversal.OldTraverserWrapper$TraverserImpl.hasNext(OldTraverserWrapper.java:76)
        at GetLeafFromNodeWithEffNewMethod.main(GetLeafFromNodeWithEffNewMethod.java:63)
Caused by: java.io.IOException: Map failed
        at sun.nio.ch.FileChannelImpl.map(Unknown Source)
        at org.neo4j.kernel.impl.nioneo.store.MappedPersistenceWindow.<init>(MappedPersistenceWindow.java:53)
        ... 29 more
Caused by: java.lang.OutOfMemoryError: Map failed
        at sun.nio.ch.FileChannelImpl.map0(Native Method)
        ... 31 more