Hi guys,
I'm facing some serious issue, and I have not a clue about its reason.
When I do a performance test on a subtree search, I do sometime get an
exception, which stack trace is :
org.apache.directory.shared.ldap.model.exception.LdapOperationErrorException
at
org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition.lookup(AbstractBTreePartition.java:1098)
at
org.apache.directory.server.xdbm.search.impl.PresenceEvaluator.evaluate(PresenceEvaluator.java:105)
at
org.apache.directory.server.xdbm.search.impl.PresenceCursor.next(PresenceCursor.java:265)
at
org.apache.directory.server.xdbm.search.impl.AndCursor.next(AndCursor.java:154)
at
org.apache.directory.server.core.partition.impl.btree.EntryCursorAdaptor.next(EntryCursorAdaptor.java:177)
at
org.apache.directory.server.core.api.filtering.BaseEntryFilteringCursor.next(BaseEntryFilteringCursor.java:472)
at
org.apache.directory.server.core.api.EntryToResponseCursor.next(EntryToResponseCursor.java:166)
at
org.apache.directory.ldap.client.api.EntryCursorImpl.next(EntryCursorImpl.java:78)
at
org.apache.directory.server.core.operations.search.SearchPerfIT.testSearchPerfSublevelScope(SearchPerfIT.java:248)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at
org.apache.directory.server.core.integ.FrameworkRunner.runChild(FrameworkRunner.java:488)
at
org.apache.directory.server.core.integ.FrameworkRunner.runChild(FrameworkRunner.java:58)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at
org.apache.directory.server.core.integ.FrameworkRunner.run(FrameworkRunner.java:256)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$ValueIterator.next(HashMap.java:822)
at
org.apache.directory.shared.ldap.model.entry.DefaultEntry.clone(DefaultEntry.java:1014)
at
org.apache.directory.server.core.api.entry.ClonedServerEntry.<init>(ClonedServerEntry.java:75)
at
org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition.lookup(AbstractBTreePartition.java:1091)
... 33 more
This is more than strange, because this exception occurs whil I try to
clone an Entry. The associated code is :
public Entry clone()
{
try
{
// First, clone the structure
DefaultEntry clone = ( DefaultEntry ) super.clone();
// Just in case ... Should *never* happen
if ( clone == null )
{
return null;
}
// An Entry has a Dn and many attributes.
clone.dn = dn; // note that Dn is immutable now
// then clone the ClientAttribute Map.
clone.attributes = ( Map<String, Attribute> ) ( ( (
HashMap<String, Attribute> ) attributes )
.clone() );
// now clone all the attributes
clone.attributes.clear();
if ( schemaManager != null )
{
for ( Attribute attribute : attributes.values() )
<<----- Exception here !
{
...
The Entry is not supposed to be modified during this test, so I don't
see how possibly we can get a ConcurrentModificationException at this
point...
One of the solution would be to make the entry an immutable element, but
it might be a costly operation, assuming we never modify an entry on the
fly...
Any help or suggestion welcomed !
--
Regards,
Cordialement,
Emmanuel Lécharny
www.iktek.com
