The problem resulting in the NonWritableChannelException occurred on Windows although I need to run on Solaris as well as Windows.
Actually I must apologise for saying that the previously reported issue didn't solicit a response - I see that Johan Svensson did just today and suggests it might be fixed in the new milestone release. My questions regarding what actual effect using the EmbeddedReadOnlyGraphDatabase is still relevant however...? On 28 Jun 2011, at 21:21, Rick Bullotta wrote: > Paul, are you on windows or Linux? > > ----- Reply message ----- > From: "Paul Bandler" <[email protected]> > Date: Tue, Jun 28, 2011 1:34 pm > Subject: [Neo4j] Advantages of EmbeddedReadOnlyGraphDatabase ? [was > NonWritableChannelException] > To: "Neo4j user discussions" <[email protected]> > > Are there advantages in accessing the database via the > EmbeddedReadOnlyGraphDatabaseclass in a read-only application? > > A week or so back I posted the message below regarding a problem experienced > while using EmbeddedReadOnlyGraphDatabase that regrettably didn't solicit any > responses and since then I've been using the standard read-write > EmbeddedGraphDatabase without repeat of the same issue even though my > application is read-only. Are there any avoidable performance penalties using > EmbeddedGraphDatabase in place of EmbeddedReadOnlyGraphDatabase? > > Along a similar lines, as my application is read-only, I'm not doing any > explicit transaction management - is there any reason why I should? > > > > Begin forwarded message: > > > From: Paul Bandler <[email protected]> > > Date: 21 June 2011 12:22:56 GMT+01:00 > > To: Neo4j user discussions <[email protected]> > > Subject: [Neo4j] NonWritableChannelException > > Reply-To: Neo4j user discussions <[email protected]> > > > > The above exception is thrown from the call stack indicated below while > > traversing a neo4j graph using the EmbededReadOnly database. Using 1.4M04. > > > > The application is running with 1gb of heap with defaulting all other > > parameters except cache_type=weak on windows. > > > > I found some reports of this exception being thrown at shutdown back > > in January but this is not happening at shutdown and I could find no posted > > resolution of that thread anyway. > > > > Can anyone suggest what the cause if this exception is? > > > > Thanks > > > > Paul > > > >> > > > >> Exception in thread "main" java.nio.channels.NonWritableChannelException > >> at sun.nio.ch.FileChannelImpl.write(Unknown Source) > >> at > >> org.neo4j.kernel.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:104) > >> at > >> org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.refreshBricks(PersistenceWindowPool.java:536) > >> 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:603) > >> at > >> org.neo4j.kernel.impl.core.NodeImpl.getMoreRelationships(NodeImpl.java:399) > >> at > >> org.neo4j.kernel.impl.core.IntArrayIterator.hasNext(IntArrayIterator.java:93) > >> at > >> org.neo4j.kernel.impl.core.NodeImpl.getSingleRelationship(NodeImpl.java:218) > >> > > _______________________________________________ > > Neo4j mailing list > > [email protected] > > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
