Concurrency problem when doing load tests

• Key: DIRSERVER-624
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Blocker
• Assignee: Alex Karasulu
• Reporter: Emmanuel Lecharny
• Affects Version/s: 1.0-RC3
• Fix Version/s: 1.5.0, 1.0-RC4

Description

When trying to do some load tests (adding 100K users, deleting them, adding them again ...) on a bi-processor computer, we get some concurrency access errors on the secong add/del run :
           _ _ ____ ____ / \ _ __ __ _ ___| |__ ___| _ \/ ___|
         / _ \ | '_ \ / _` |/ __| '_ \ / _ \ | | \___ \ / ___ \| |_) | (_| | (__| | | | __/ |_| |___) |
       /_/ \_\ .__/ \__,_|\___|_| |_|\___|____/|____/ |_|
 [08:00:07] WARN [org.apache.directory.server.core.DefaultDirectoryService] - You didn't change the admin password of directory service instance 'default'. Please update the admin password as soon as possible to prevent a possible security breach.
[10:33:24] WARN [org.apache.directory.server.ldap.LdapProtocolProvider$LdapProtocolHandler] - [/193.140.236.75:42091] Unexpected exception forcing session to close: sending disconnect notice to client. java.util.ConcurrentModificationException
        at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1031) at java.util.TreeMap$KeyIterator.next(TreeMap.java:1058)
        at org.apache.directory.server.core.partition.impl.btree.TupleEnumeration.next(TupleEnumeration.java:66)
        at org.apache.directory.server.core.partition.impl.btree.IndexEnumeration.prefetch(IndexEnumeration.java:151)
        at org.apache.directory.server.core.partition.impl.btree.IndexEnumeration.next(IndexEnumeration.java:94)
        at org.apache.directory.server.core.partition.impl.btree.IndexAssertionEnumeration.prefetch(IndexAssertionEnumeration.java:155)
        at org.apache.directory.server.core.partition.impl.btree.IndexAssertionEnumeration.next(IndexAssertionEnumeration.java:117)
        at org.apache.directory.server.core.partition.impl.btree.DisjunctionEnumeration.next(DisjunctionEnumeration.java:163)
        at org.apache.directory.server.core.partition.impl.btree.IndexAssertionEnumeration.prefetch(IndexAssertionEnumeration.java:155)
        at org.apache.directory.server.core.partition.impl.btree.IndexAssertionEnumeration.next(IndexAssertionEnumeration.java:117)
        at org.apache.directory.server.core.partition.impl.btree.BTreeSearchResultEnumeration.next(BTreeSearchResultEnumeration.java:99)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.prefetch(SearchResultFilteringEnumeration.java:287)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.next(SearchResultFilteringEnumeration.java:201)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.prefetch(SearchResultFilteringEnumeration.java:287)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.next(SearchResultFilteringEnumeration.java:201)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.prefetch(SearchResultFilteringEnumeration.java:287)
        at org.apache.directory.server.core.enumeration.SearchResultFilteringEnumeration.next(SearchResultFilteringEnumeration.java:201)
        at org.apache.directory.server.ldap.support.SearchResponseIterator.next(SearchResponseIterator.java:185)
        at org.apache.directory.server.ldap.support.SearchHandler.messageReceived(SearchHandler.java:281)
        at org.apache.mina.handler.demux.DemuxingIoHandler.messageReceived(DemuxingIoHandler.java:128)
        at org.apache.directory.server.ldap.LdapProtocolProvider$LdapProtocolHandler.messageReceived(LdapProtocolProvider.java:431)
        at org.apache.mina.common.support.AbstractIoFilterChain$2.messageReceived(AbstractIoFilterChain.java:188)
        at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:501)
        at org.apache.mina.common.support.AbstractIoFilterChain.access$1000(AbstractIoFilterChain.java:51)
        at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:787)
        at org.apache.mina.filter.LoggingFilter.messageReceived(LoggingFilter.java:95)
        at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:501)
        at org.apache.mina.common.support.AbstractIoFilterChain.access$1000(AbstractIoFilterChain.java:51)
        at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:787)
        at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:187)
        at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:501)
        at org.apache.mina.common.support.AbstractIoFilterChain.access$1000(AbstractIoFilterChain.java:51)
        at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:787)
        at org.apache.mina.filter.ThreadPoolFilter.processEvent(ThreadPoolFilter.java:718)
        at org.apache.mina.filter.ThreadPoolFilter$Worker.processEvents(ThreadPoolFilter.java:474)
        at org.apache.mina.filter.ThreadPoolFilter$Worker.run(ThreadPoolFilter.java:429)