Hello, I've started implementing Client for Neo4j to evaluate that with *BG benchmark* <http://bgbenchmark.org/BG/overview.html>. It was working well with 1 thread, but when I was trying to load the database with more than 1 thread, it threw an exception:
java.lang.RuntimeException: Error starting org.neo4j.kernel.EmbeddedGraphDatabase, C:\Users\Reihane\Documents\Neo4j\default.graphdb at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:333) at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:63) at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:92) at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:198) at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:69) at Neo4j.Neo4jClient.init(Neo4jClient.java:110) at edu.usc.bg.base.DBWrapper.init(DBWrapper.java:62) at edu.usc.bg.base.Client.executeDoLoad(Client.java:1013) at edu.usc.bg.base.Client.runBG(Client.java:892) at edu.usc.bg.BGMainClass.main(BGMainClass.java:41) Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.StoreLockerLifecycleAdapter@2e8da6a9' was successfully initialized, but failed to start. Please see attached cause exception. at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:504) at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115) at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:310) ... 9 more Caused by: org.neo4j.kernel.StoreLockException: Unable to obtain lock on store lock file: C:\Users\Reihane\Documents\Neo4j\default.graphdb\store_lock. Please ensure no other process is using this database, and that the directory is writable (required even for read-only access) at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:87) at org.neo4j.kernel.StoreLockerLifecycleAdapter.start(StoreLockerLifecycleAdapter.java:44) at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498) ... 11 more Caused by: java.io.IOException: Couldn't lock lock file C:\Users\Reihane\Documents\Neo4j\default.graphdb\lock because another process already holds the lock. at org.neo4j.kernel.impl.nioneo.store.FileLock.getLockFileBasedFileLock(FileLock.java:115) at org.neo4j.kernel.impl.nioneo.store.FileLock.getOsSpecificFileLock(FileLock.java:63) at org.neo4j.kernel.DefaultFileSystemAbstraction.tryLock(DefaultFileSystemAbstraction.java:89) at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:74) ... 13 more By removing the line graphdb.shutdown() from my code, now it's working fine with multiple threads. But I'm really curious why this might happen? You can find the entire conversation here: *https://groups.google.com/forum/#!topic/bg-socialbenchmark/NU4ZSVei_Es*<https://groups.google.com/forum/#!topic/bg-socialbenchmark/NU4ZSVei_Es> -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
