First I will describe the whole scheme.
On the one machine running base Neo4j. On the second machine running a
service that constantly fills the base neo4j data using REST-requests.
To solve the internal task was written a web-application on java, which runs
on the first machine and to retrieve data from the database using
GraphDatabaseService graphDb = new
EmbeddedReadOnlyGraphDatabase("/home/sometime/neo4j-enterprise-1.4.1/data/graph.db");
IndexManager im = graphDb.index();
Index<Node> index = im.forNodes("WMC_Users");
IndexHits<Node> hit = index.get("UserID", UserID);
Node root = hit.getSingle();
MightKnowEvaluator paths = new MightKnowEvaluator();
Traverser nodes = (Traverser) Traversal.description()
.depthFirst()
.prune(Traversal.pruneAfterDepth(2))
.relationships(DynamicRelationshipType.withName("KNOWS"),
Direction.OUTGOING)
.uniqueness(Uniqueness.NODE_PATH)
.evaluator(paths)
.traverse(root);
and further manipulation of the nodes.
I.e. our military application sends GET-request to this java-application and
receiving data.
Here is the problem. *Sometimes the java-application is broken and get the
error:*
java.lang.RuntimeException: java.io.FileNotFoundException:
/home/sometime/neo4j-enterprise-1.4.1/data/graph.db/index/lucene/node/WMC_Users/_qec8.cfs
(No such file or directory)
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexWriter(LuceneDataSource.java:601)
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexSearcher(LuceneDataSource.java:484)
org.neo4j.index.impl.lucene.LuceneIndex.query(LuceneIndex.java:248)
org.neo4j.index.impl.lucene.LuceneIndex.get(LuceneIndex.java:187)
neo.GetMightKnowUsers(neo.java:41)
GetUsers.service(GetUsers.java:28)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
but the base itself continues to function properly. AND REST-request to fill
the data are successful.
*Of course, I stop the base neo4j and start. But after this base is not up
... error:*
org.neo4j.graphdb.TransactionFailureException: No mapping found for
branchId[0x162374]
at
org.neo4j.kernel.impl.transaction.XaDataSourceManager.getXaResource(XaDataSourceManager.java:187)
at
org.neo4j.kernel.impl.transaction.TxManager.getXaResource(TxManager.java:989)
at
org.neo4j.kernel.impl.transaction.TxManager.buildRecoveryInfo(TxManager.java:463)
at
org.neo4j.kernel.impl.transaction.TxManager.recover(TxManager.java:276)
at org.neo4j.kernel.impl.transaction.TxManager.init(TxManager.java:199)
at org.neo4j.kernel.impl.transaction.TxModule.start(TxModule.java:96)
at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:161)
at
org.neo4j.kernel.EmbeddedGraphDbImpl.<init>(EmbeddedGraphDbImpl.java:189)
at
org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:79)
then I pick up the backup database and run everything in normal mode ...
why sometimes this error? what could be the reason?
--
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