Ioannis Mavroukakis a écrit :
Hey fellow listers.
Hi Ioannis,
if you get 100% loaded CPU the it might be MINA which is the problem.
There is a painful bug in the way the JVM handle epoll, and in certain
conditions, it jump to 100% CPU and never goes down. It seems to be a
problem when a connection is opened, and closed before the selector can
see the close : the select() methods returns at least one selectedKey,
but as the connection has been closed, it does nothing but loop again
(as you can imagine, the loop is infinite).
There is a fix for that, but it's experimental, in MINA branch
http://svn.apache.org/repos/asf/mina/branches/select-fix/. I will commit
this fix immediately in the MINA trunk, and you'll be able to bump up
the MINA version to 2.0.0-RC2-SNAPSHOT in ADS.
Not sure though that it's really your problem.
I've got an issue with an embedded instance of apacheds in a trivial
piece of java code. For reasons I have been unable to diagnose
so far, it will run happily for about a week or so, then it will
suddenly ramp up the load on the server it's running on, with the only
way to recover it, being to delete the physical directory where the
records are stored and start from scratch. What's puzzling me is
that it's definitely not load related as the queries an operations to
LDAP are very lightweight and infrequent. What I do get in the logs
are loads of these
pool-4-thread-18 ERROR registries.DefaultAttributeTypeRegistry -
attributeType w/ OID 1.3.6.1.4.1.1466.115.121.1.12 not registered!
pool-4-thread-19 ERROR registries.DefaultAttributeTypeRegistry -
attributeType w/ OID 1.3.6.1.4.1.1466.115.121.1.12 not registered!
pool-4-thread-19 WARN context.SearchingOperationContext - Requested
attribute dn does not exist in the schema, it will be ignored
pool-4-thread-18 WARN context.SearchingOperationContext - Requested
attribute dn does not exist in the schema, it will be ignored
NioProcessor-2 WARN ldap.LdapProtocolHandler - Null LdapSession given
to cleanUpSession.
pool-4-thread-19 ERROR registries.DefaultAttributeTypeRegistry -
attributeType w/ OID 1.3.6.1.4.1.1466.115.121.1.12 not registered!
pool-4-thread-17 ERROR registries.DefaultAttributeTypeRegistry -
attributeType w/ OID 1.3.6.1.4.1.1466.115.121.1.12 not registered!
and
pool-4-thread-19 WARN ldap.LdapProtocolHandler - Unexpected exception
forcing session to close: sending disconnect notice to client.
java.lang.NullPointerException
at
org.apache.directory.server.ldap.handlers.LdapRequestHandler.handleMessage(LdapRequestHandler.java:129)
at
org.apache.directory.server.ldap.handlers.LdapRequestHandler.handleMessage(LdapRequestHandler.java:56)
at
org.apache.mina.handler.demux.DemuxingIoHandler.messageReceived(DemuxingIoHandler.java:232)
at
org.apache.directory.server.ldap.LdapProtocolHandler.messageReceived(LdapProtocolHandler.java:194)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:721)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:433)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:801)
at
org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:71)
at org.apache.mina.core.session.IoEvent.run(IoEvent.java:63)
at
org.apache.mina.filter.executor.UnorderedThreadPoolExecutor$Worker.runTask(UnorderedThreadPoolExecutor.java:480)
at
org.apache.mina.filter.executor.UnorderedThreadPoolExecutor$Worker.run(UnorderedThreadPoolExecutor.java:434)
at java.lang.Thread.run(Thread.java:619)
pool-4-thread-19 WARN ldap.LdapProtocolHandler - Null LdapSession
given to cleanUpSession.
NioProcessor-3 WARN ldap.LdapProtocolHandler - Null LdapSession given
to cleanUpSession.
The only thing I can think of causing the NPE's is a monitoring
application that we have, that connects and disconnects from ADS to
confirm
that it's still there...Apart from that I have no plausible
explanation for the high load. I'm currently using 1.5.6 compiled from
source.
Thanks,
Yiannis
