2010/1/26 Symeon (Akis) Papadopoulos <papa...@iti.gr>: > Mattias Persson wrote: >> Ah, do you make sure you call IndexHits#close() on your results from >> getNodes(), alternatively iterating over the whole result (in which >> case it's automatically closed)? >> > Actually I'm calling the getSingleNode, thus I have no access on the > IndexHits object. Oh ok, then this isn't a problem > > >> See more information at >> http://components.neo4j.org/neo4j-index/apidocs/index.html >> >> Are you using the "index" component btw (artifactId: neo4j-index)? >> > Yes. > > Is it possible that the problem is caused due to the fact that we > perform several writes in both the graph and the index and we don't > commit and that we read in between the transaction commits? No that shouldn't cause any problems. This looks like a bug then. Could you give us more information about your code, some snippets perhaps or a test case which can trigger it again? > > >> 2010/1/26 Symeon (Akis) Papadopoulos <papa...@iti.gr>: >> >>> Hi all >>> >>> While populating a Neo graph, I got the attached exception >>> (org.apache.lucene.index.MergePolicy$MergeException. See file for details: I >>> replaced a local path with [some-local-path]). >>> My setup is like this: I want to benchmark Neo4j for some operations, >>> amongst which is graph loading. >>> So, I try to load graphs of various sizes to Neo4j. Up to size 1M edges the >>> graphs are loaded without any problem, but then this exception is thrown. I >>> suspect this has to do with the transaction management in my program, which >>> is handled by a BatchTxManager (a class written by me, thus highly likely to >>> be the source of trouble). Does the exception ring any bells? What could I >>> try out in order to identify the problem? >>> >>> Best regards, >>> Akis >>> >>> >>> >>> Exception in thread "Lucene Merge Thread #0" >>> org.apache.lucene.index.MergePolicy$MergeException: >>> java.io.FileNotFoundException: /[some-local-path]/_4k.cfs (Too many open >>> files) >>> at >>> org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:351) >>> at >>> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:315) >>> Caused by: java.io.FileNotFoundException: /[some-local-path]/_4k.cfs (Too >>> many open files) >>> at java.io.RandomAccessFile.open(Native Method) >>> at java.io.RandomAccessFile.<init>(RandomAccessFile.java:233) >>> at >>> org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput$Descriptor.<init>(SimpleFSDirectory.java:78) >>> at >>> org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput.<init>(SimpleFSDirectory.java:108) >>> at >>> org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.<init>(NIOFSDirectory.java:94) >>> at >>> org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:70) >>> at >>> org.apache.lucene.index.CompoundFileReader.<init>(CompoundFileReader.java:70) >>> at >>> org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:111) >>> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:638) >>> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:608) >>> at >>> org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:686) >>> at >>> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4979) >>> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4614) >>> at >>> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:235) >>> at >>> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:291) >>> Exception in thread "main" >>> org.neo4j.kernel.impl.transaction.TransactionFailureException: Unable to >>> commit transaction >>> at >>> org.neo4j.kernel.EmbeddedGraphDbImpl$TransactionImpl.finish(EmbeddedGraphDbImpl.java:331) >>> at >>> org.neo4j.util.SimpleBatchTxManager.beginReadOperation(SimpleBatchTxManager.java:94) >>> at >>> graph.implementation.neo.STSGraphNeoImpl.getUserNeo(STSGraphNeoImpl.java:463) >>> at >>> graph.implementation.neo.STSGraphNeoImpl.increaseUserTagFreq(STSGraphNeoImpl.java:824) >>> at >>> graph.benchmark.LoadGraphBenchmark.runRealBenchmark(LoadGraphBenchmark.java:433) >>> at >>> graph.benchmark.LoadGraphBenchmark.main(LoadGraphBenchmark.java:489) >>> Caused by: java.lang.RuntimeException: Unable to close lucene writer >>> org.apache.lucene.index.indexwri...@32a4eb93 >>> at >>> org.neo4j.index.lucene.LuceneDataSource.removeWriter(LuceneDataSource.java:413) >>> at >>> org.neo4j.index.lucene.LuceneTransaction.doCommit(LuceneTransaction.java:197) >>> at >>> org.neo4j.kernel.impl.transaction.xaframework.XaTransaction.commit(XaTransaction.java:316) >>> at >>> org.neo4j.kernel.impl.transaction.xaframework.XaResourceManager.commit(XaResourceManager.java:399) >>> at >>> org.neo4j.kernel.impl.transaction.xaframework.XaResourceHelpImpl.commit(XaResourceHelpImpl.java:64) >>> at >>> org.neo4j.kernel.impl.transaction.TransactionImpl.doCommit(TransactionImpl.java:514) >>> at >>> org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:573) >>> at >>> org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:543) >>> at >>> org.neo4j.kernel.impl.transaction.TransactionImpl.commit(TransactionImpl.java:102) >>> at >>> org.neo4j.kernel.EmbeddedGraphDbImpl$TransactionImpl.finish(EmbeddedGraphDbImpl.java:316) >>> ... 5 more >>> Caused by: java.io.IOException: directory '/[some-local-path]/resource_id' >>> exists and is a directory, but cannot be listed: list() returned null >>> at org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:516) >>> at org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:531) >>> at >>> org.apache.lucene.index.IndexFileDeleter.refresh(IndexFileDeleter.java:307) >>> at >>> org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:4300) >>> at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:4192) >>> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:4183) >>> at >>> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2190) >>> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2153) >>> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2117) >>> at >>> org.neo4j.index.lucene.LuceneDataSource.removeWriter(LuceneDataSource.java:409) >>> ... 14 more >>> >>> >>> _______________________________________________ >>> Neo mailing list >>> User@lists.neo4j.org >>> https://lists.neo4j.org/mailman/listinfo/user >>> >>> >>> >> >> >> >> > > _______________________________________________ > Neo mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user >
-- Mattias Persson, [matt...@neotechnology.com] Neo Technology, www.neotechnology.com _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
