I have set transaction support to "Xa-Transaction" (In glassfish
properties) ,
i believe what i'm using is CMT, container managed transactions,
so glassfish is in charge of handling connections and kill them,
invalidate them or mark them as available
once the transaction has commited.
I discovered something interesting: when saving files everything went
smooth,
save thousands with no problem, seeing in glassfish monitoring console
how many hundred
of connections are created, used, and disposed within seconds.
Absolutely no errors.
But when i get stuff from the repository, that's when connections begin
to get leaked.
That's make me think that since there's no transaction commited the
connection stays open.
I tried to retrieve files from jackrabbit outside of a transactional
context and inside too, with no luck, same
PoolingException / out of connections error.
My service to reach jackrabbit, the place where the transactional
context begins are annotated like this:
@LocalBean
@Stateless
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
I smell that's precisely the problem: since i have
"bindSessionToTransaction=true",
if i try to reach repository inside or outside any transaction, doesn't
matter, since
there's really no commit at all, connections will stale.
I'm going to try doing a second connection pool with
"bindSessionToTransaction=false",
using it only to retrieve stuff from jackrabbit.
I'll tell you how it goes soon, thanks a lot for your responses,
cheerz,
Manuel.
On 03/01/18 17:22, Pontus Amberg wrote:
What are you using to handle the transactions when you invoke the
Jackrabbit JCA connector? The reason I'm asking is that the flag
"bindSessionToTransaction=true" might maybe be an indication that you have
transactions that for some reason never are committed.
/Pontus
On Tue, Jan 2, 2018 at 8:18 PM, Manuel López Blasi <
lopezbl...@conicet.gov.ar> wrote:
Monitoring Glassfish shows all connections are taken up ( and not freed ):
NumConnUsed 32count Jan 2, 2018 10:48:22 AM Jan 2,
2018 3:58:20 PM Marca de Agua Máxima: 32 count
Marca de Agua Mínima: 0 count
Provides connection usage statistics. The total number of
connections that are currently being used, as well as information about the
maximum number of connections that were used (the high water mark).
All 32 connections are taken already.
On 02/01/18 15:00, Manuel López Blasi wrote:
Hello, thanks for your response Pontus,
i have set a maximun of concurrent connections, 32.
I understand that i set a maximum number o sessions/connections/transactions,
in my case on glassfish.
These is handled by the jca connector y conjunction with the glassfish
server/container.
Once this maximun is reached, should i ask for another new connection,
the connector/connection pool would wait
until one of the bussy connections is freed. There is a wait timeout for
this, once the time is elapsed the connection pool
would return an error message, saying that no connection is available.
It's perfectly logical.
In my case this is happening, i get an exception "Connections in use are
equal to max-pool-size value and max-wait-time has elapsed":
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Las
conexiones en uso equivalen al valor de max-pool-size y el tiempo caducado
de max-wait-time. No se pueden asignar m?s conexiones.
at com.sun.enterprise.resource.pool.ConnectionPool.getResource(
ConnectionPool.java:418)
at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource
FromPool(PoolManagerImpl.java:245)
at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource
(PoolManagerImpl.java:170)
at com.sun.enterprise.connectors.ConnectionManagerImpl.getResou
rce(ConnectionManagerImpl.java:332)
at com.sun.enterprise.connectors.ConnectionManagerImpl.internal
GetConnection(ConnectionManagerImpl.java:301)
at com.|#]
[#|2018-01-02T14:23:20.456-0300|SEVERE|glassfish3.1.2|javax.
enterprise.system.std.com.sun.enterprise.server.logging|_
ThreadID=409;_ThreadName=Thread-2;|sun.enterprise.
connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:190)
at com.sun.enterprise.connectors.ConnectionManagerImpl.allocate
Connection(ConnectionManagerImpl.java:165)
at com.sun.enterprise.connectors.ConnectionManagerImpl.allocate
Connection(ConnectionManagerImpl.java:160)
at org.apache.jackrabbit.jca.JCARepositoryHandle.login(JCARepos
itoryHandle.java:75)
The thing is, once i reach this state it remains the same, i can wait 10
minutes or 5 hours, when it dies, it stays that way no matter how long i
leave it "to recover connections".
The only solution is to shut down server and start it again, that way
everything works great again.
One other thing that seems strange is the fact that i can work generating
files in number of thousands in very short time, let's say 2000 files in 3
minutes. That may indicate
that the time settings for the connection pool are okay, i mean, i have 1
minute of max wait time before saying there're no more free connections,
almost a thousand files can be fully
processed and saved within 1 minute.
That's what leaves me perplexed. The other thing is that mysql connection
pools have the very same / carbon copy settings and they work ok, never run
off connections or died this way.
I know files are way different, requires more work than db registers, I/O
is the most time consuming and slow op of them all. Maybe within a certain
amount of time the file caching gets
bottlenecked and that's what causes the collapse?
On 29/12/17 11:17, Pontus Amberg wrote:
Have you verified that it isn't the number of concurrent
sessions/transactions that is causing the problem? If that is the problem
you would probably only encounter it when you have approximately 33 or
more
file operations executing at the same time.
/Pontus
On Tue, Dec 26, 2017 at 11:28 PM, Manuel López Blasi <
lopezbl...@conicet.gov.ar> wrote:
Hello,
i've been adding almost successfully Jackrabbit Repository to our
project,
basically for file storing purposes. Everything works great, with some
exceptions,
one which is critical, once in a while, following no apparent pattern an
exception is thrown
saying the pool is out of connections, this one:
Caused by: com.sun.appserv.connectors.internal.api.PoolingException:
Las conexiones en uso equivalen al valor de max-pool-size y el tiempo
caducado de max-wait-time. No se pueden asignar m?s conexiones.
(Quantity of connections in use are same as defined max-pool-size and
max-wait-time already elapsed. Can't assign any more connections.)
at com.sun.enterprise.resource.pool.ConnectionPool.getResource(
ConnectionPool.java:418)
at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource
FromPool(PoolManagerImpl.java:245)
at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource
(PoolManagerImpl.java:170)
at com.sun.enterprise.connectors.ConnectionManagerImpl.getResou
rce(ConnectionManagerImpl.java:332)
at com.sun.enterprise.connectors.ConnectionManagerImpl.internal
GetConnection(ConnectionManagerImpl.java:301)
at com.sun.enterprise.connectors.ConnectionManagerImpl.allocate
Connection(ConnectionManagerImpl.java:190)
at com.sun.enterprise.connectors.ConnectionManagerImpl.allocate
Connection(ConnectionManagerImpl.java:165)
at com.sun.enterprise.connectors.ConnectionManagerImpl.allocate
Connection(ConnectionManagerImpl.java:160)
at org.apache.jackrabbit.jca.JCARepositoryHandle.login(JCARepos
itoryHandle.java:75)
... 120 more
Our setup/context is the following:
VM: java 7 (1.7.0_101)
container: Glassfish 3.1.2.2
main framework for webapp: struts 2
DB (mysql) persistence manager: Hibernate 4.2.19.Final
Jackrabbit stuff/versions:
jackrabbit-core 2.14.4
jcr 2.0
OCM: jackrabbit-ocm 2.0.0
Connector: jackrabbit-jca-2.14.4 (This one is deployed as a connector in
glassfish, associated with a connection pool )
The configuration for JCA connector is the following:
Connection definition: javax.jcr.Repository
Initial and minimum pool size: 8 Connections
Maximum pool size: 32 Connections
Switch Pool size: 2 connections
Activity Timeout 300 seconds
Max Wait Timeout: 60000 miliseconds
Transaction Support: XATransaction
Matching Connections: Yes.
bindSessionToTransaction: True
It seems to be caused randomnly, as we're able to produce and store a
couple thousand of files within minutes with no crashes
(every file is stored within a transaction and with a single Session to
the repository). Should the pool be out of connections,
it should happen immediately i think (???).
So, if someone has any indication/clues it would be greatly appreciated,
thanks in advance, best regards,
Manuel.
