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:
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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