How did this simplistic test generate behavior OOM?

Hi all.

We have tested the Jena API in rdf_semantic_graph_support_for_apache_jena_2.11.1_with_12101_server_patch_build0529 and observe the following behavior, based on the test attached:

oom.png

The test is rather simplistic: any help is appreciated!

Thank you, Jan-Helge.

public class OracleSemTxIntegrationWithSpringITCase {}

private OracleDataSource oracleDataSource;

Private OraclePool oraclePool;


@Before

Public Sub before() throws SQLException {}

java.util.Properties prop = new java.util.Properties ();

prop.setProperty ("MinLimit", "2");     the cache size is at least 2

prop.setProperty ("MaxLimit", "10");

prop.setProperty ("InitialLimit", "2"); create 2 connections at startup

prop.setProperty ("InactivityTimeout", "200");    seconds

prop.setProperty ("AbandonedConnectionTimeout", "100");  seconds

prop.setProperty ("MaxStatementsLimit", "10");

prop.setProperty ("PropertyCheckInterval", "60"); seconds

oracleDataSource = new OracleDataSource();

oracleDataSource.setURL ("jdbc:oracle:thin:@***");

oracleDataSource.setUser ("rdfuser");

oracleDataSource.setPassword("***");

oracleDataSource.setConnectionProperties (prop);

oraclePool = new OraclePool (oracleDataSource);

}

@Test

Public Sub testTransactionHandlingViaJdbcTransactions() throws Exception {}

final Oracle oracle1 = oraclePool.getOracle ();

final Oracle oracle2 = oraclePool.getOracle ();

final Oracle oracle3 = oraclePool.getOracle ();

final GraphOracleSem Chart1 = new GraphOracleSem (oracle1, OracleMetadataDaoITCase.INTEGRATION_TEST_MODEL);

latest model model1 = new ModelOracleSem (graph1);

final GraphOracleSem graph2 = new GraphOracleSem (oracle2, OracleMetadataDaoITCase.INTEGRATION_TEST_MODEL);

latest model model2 = new ModelOracleSem (graph2);

Graph3 GraphOracleSem = new GraphOracleSem (oracle3, OracleMetadataDaoITCase.INTEGRATION_TEST_MODEL);

Model group.3 = new ModelOracleSem (graph3);

removePersons (model3);

Model3.commit ();

Model3.close ();

graph3 = new GraphOracleSem (oracle3, OracleMetadataDaoITCase.INTEGRATION_TEST_MODEL);

athymique3 = new ModelOracleSem (graph3);

model1.add (model1.createResource ("http://www.tv2.no/people/person-1"), DC.description, "A man");

model2.add (model1.createResource ("http://www.tv2.no/people/person-2"), DC.description, 'SOMEONE else');

int countPersons = countPersons (model3);

assertEquals (0, countPersons);

Model1.commit ();

countPersons = countPersons (model3);

assertEquals (1, countPersons);

System.Err.println ("principal connection #1\n");

Model2.commit ();

countPersons = countPersons (model3);

assertEquals (2, countPersons);

oracle1.CommitTransaction ();

Oracle2.CommitTransaction ();

oracle3.CommitTransaction ();

Model1.close ();

Model2.close ();

Model3.close ();

oracle1. Dispose();

Oracle2.Dispose ();

oracle3. Dispose();

System.Err.println ("happy");

}

Public Shared Sub main (String... args) throws Exception {}

OracleSemTxIntegrationWithSpringITCase me = new OracleSemTxIntegrationWithSpringITCase();

me. Before();

System.Err.println ("Start");

Stopwatch sw = Stopwatch.createStarted ();

for (int n = 0; n < 1000; n ++) {}

System.Err.println ("-" + n);

me.testTransactionHandlingViaJdbcTransactions ();

}

System.Err.println ("DONE:" + sw.stop ());

me.after ();

System.Err.println ("all DONE");

}

@After

public void after() throws SQLException {}

oracleDataSource.close ();

}

private int countPersons (latest model) {}

Return listPersons (model) () .size;

}

{} private void removePersons (latest model)

System.Err.println ("list of people with remove...\n");

final list < Resource > people = listPersons (model);

System.Err.printf ("Removing %d persons\n", persons.size ());

Persons.Stream () .forEach (by-> model.removeAll (per, null, null));

}

private list < Resource > listPersons (latest model) {}

final list < Resource > people = Lists.newArrayList ();

ExtendedIterator < Resource > iter = model.listSubjects)

.filterKeep (new filter < Resource > () {}

@Override

public boolean accept (resource o) {}

return o.getURI () .startsWith ("http://www.tv2.no/people/person-" "");

}

})

;

iter.forEachRemaining (item-> persons.add (item));

ITER. Close();

return people;

}

}

Good new!

I can confirm that the generation attached 3-11320855021 does the trick.

With and without setConnectionCachingEnabled (true), we find ourselves with a lot to the approximately 12-17 MB after our simple test is made - which seems to be an OK number at this stage.

Above: ConnectionCachingEnabled = true - GC forced discounting heap historgram at ports of notable decline in the heap graph.

At the bottom: with ConnectionCachingEnabled = false (in fact undefined) - GC - ing as above.

We are pleased to move forward with this hotfix for this problem.

Thank you!

BR, Jan-Helge

Tags: Database

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