On 16.11.10 14:47, Bergquist, Brett wrote:
I am using Derby as a database as part of a Glassfish installation. I
am processing JMS messages with each one causing access to the Derby
database via Eclipselink. After about 80K to 100K messages processed,
I have a hung system.
I run jstack on the Derby network server and there is no deadlock.
Also I run jstack on the Glassfish and there is no deadlock. In the
thread stack for Glassfish I see a thread with the following stack trace:
Hi Brett,
Nothing concrete for this particular problem, but some ideas that might
bring something more to the table:
a) Can you replace derbyClient.jar in Glassfish with a newer version
and reproduce?
This should be as simple as shutting down Glassfish and replacing
the file (you don't have to upgrade the server).
b) If you have a large number of connections this won't do any good,
but where is the DRDAConnThread thread in the network server when Derby
has hung?
c) Run the server with the debug build (there are some extra asserts
in there for the session data piggyback mechanism), and for good
measure, set derby.stream.error.logSeverityLevel=0.
--- Note that DRDA protocol traces are likely to contain user data.
Consider this before making them public.
d) Spend some time learning how to enable DRDA tracing on the client
(see [1]).
e) Enable DRDA tracing on the server (see [1]).
At first sight this looks like a protocol error, perhaps where both the
server and the client are waiting for more data.
Note that the DRDA traces aren't necessarily that easy to understand
unless you're familiar with the protocol, so if you obtain them you may
want to log a Jira issue [2] and attach them there.
Hope this helps,
--
Kristian
[1] http://wiki.apache.org/db-derby/ProtocolDebuggingTips
[2] https://issues.apache.org/jira/browse/DERBY
"p: thread-pool-1; w: 3" daemon prio=6 tid=0x5de34800 nid=0xb94
runnable [0x60abe000..0x60abfd94]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at org.apache.derby.client.net.Reply.fill(Unknown Source)
at
org.apache.derby.client.net.Reply.ensureALayerDataInBuffer(Unknown Source)
at org.apache.derby.client.net.Reply.readDssHeader(Unknown Source)
at
org.apache.derby.client.net.Reply.startSameIdChainParse(Unknown Source)
at
org.apache.derby.client.net.NetConnectionReply.readExchangeServerAttributes(Unknown
Source)
at
org.apache.derby.client.net.NetConnection.readServerAttributesAndKeyExchange(Unknown
Source)
at
org.apache.derby.client.net.NetConnection.readAllConnectCommandsChained(Unknown
Source)
at
org.apache.derby.client.net.NetConnection.readDeferredReset(Unknown
Source)
at
org.apache.derby.client.net.NetAgent.readDeferredResetConnection(Unknown
Source)
at org.apache.derby.client.net.NetAgent.beginReadChain(Unknown
Source)
at org.apache.derby.client.am.Agent.flow(Unknown Source)
at org.apache.derby.client.am.Statement.flowExecute(Unknown
Source)
at org.apache.derby.client.am.Statement.executeQueryX(Unknown
Source)
at org.apache.derby.client.am.Statement.executeQuery(Unknown
Source)
- locked <0x1d90dba0> (a
org.apache.derby.client.net.NetConnection40)
at
org.apache.derby.client.am.Connection.getTransactionIsolation(Unknown
Source)
at
org.apache.derby.client.am.LogicalConnection.getTransactionIsolation(Unknown
Source)
at
com.sun.gjc.spi.ManagedConnectionFactory.resetIsolation(ManagedConnectionFactory.java:463)
at
com.sun.gjc.spi.ManagedConnection.resetConnectionProperties(ManagedConnection.java:354)
at
com.sun.gjc.spi.ManagedConnection.getConnection(ManagedConnection.java:328)
at
com.sun.enterprise.resource.ConnectorAllocator.fillInResourceObjects(ConnectorAllocator.java:155)
at
com.sun.enterprise.resource.AbstractResourcePool.getResource(AbstractResourcePool.java:514)
at
com.sun.enterprise.resource.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:248)
at
com.sun.enterprise.resource.PoolManagerImpl.getResource(PoolManagerImpl.java:176)
at
com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:337)
at
com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:189)
at
com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:165)
at
com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:158)
This thread is making no progress at all. This is the one hanging my
system. The derby log shows:
2010-11-15 23:57:46.593 GMT : Apache Derby Network Server - 10.5.3.0 -
(802917) started and ready to accept connections on port 1527
----------------------------------------------------------------
2010-11-16 00:00:20.078 GMT:
Booting Derby version The Apache Software Foundation - Apache Derby -
10.5.3.0 - (802917): instance a816c00e-012c-51f9-12b2-0000376d74d3
on database directory C:\Documents and Settings\Brett
Bergquist\.netbeans-derby\csemdb
Database Class Loader started - derby.database.classpath='CSEM.csemderby'
(END)
The rest of Glassfish is up and running as well as other parts of my
application. This one thread, however, is causing my JMS processing
to be hung.
This is the second time in two days of testing that this has
occurred. The previous lockup has exactly the same thread stack
traceback in a few other threads, all from different database queries,
all stuck at the same point. Restarting the derby network server,
caused the condition to clear up as far as the application server is
concerned, so I am pretty confident it is related to derby.
Any help on where to look to find this problem will be greatly
appreciated.
Brett
