Re: Connection timeout

[Armin Waibel <ar...@apache.org>]

Hi,

Alessandro Colantoni wrote:
> I understand you do not have a deadlock, but you have a process very slow.
> As Armin said a timeout on the transaction is not available on Ojb. It will
> be very useful, as it avoid problems with bad operation. 

To support PB-tx timeout OJB has to start a background thread which 
periodically checks for timed out PB-tx - I don't like this idea (this 
can cause all known thread issues like deadlocks, ...).

regards,
Armin


> Anyway, what the
> timeout will not be the solution. I was asking a timeout not to solve the
> problem, but just to avoid kill the process manually when there are 
> problem.
> Of course if there are problem something is going wrong in the code, and 
> the
> bug has to be fixed anyway.
> In my opinion, what you should do is to force ojb to print out the query
> where your debugger is stuck.
> Than try to execute the same query directly on your database. The problem
> could be there
> To force to print out queries you have to edit the file
> OJB-logging.properties.
> change the entry
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.LogLevel=WARM
> in
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.LogLevel=DEBUG 
> 
> 
> I hope this is helpful
> 
> Alessandro
> 
> 
> 
> 
> 
> On 2/28/07, Ferrer, Eric <er...@transcore.com> wrote:
>>
>> Alessandro,
>>
>> It's the same problem, although I connect to numerous database I do get
>> page locks in MSSQL but once the process finishes blocking everything
>> runs smoothly.  However there are time I perform a database query and
>> the process just seems to hang, latterly my debugger is stuck on the
>> call to the database.  There is no large resultset expect, the table is
>> properly index just some time of connectivity issue.  When this happens
>> I want to set a time out setting and attempt to have the code/driver/or
>> database cancel the transaction.
>>
>> -----Original Message-----
>> From: Alessandro Colantoni [mailto:alessandro.colantoni@gmail.com]
>> Sent: Wednesday, February 28, 2007 2:02 AM
>> To: OJB Users List
>> Subject: Re: Connection timeout
>>
>> Hi Eric,
>> I fixed the issue. I had a typical deadlock, with two transaction
>> working on
>> the same objects, where each one was waiting the other one finishing his
>> job. Anyway I'm working with just one database.
>> I don't think we're talking about the same problem, anyway try telling
>> something more about your problem, sure you will be helped.
>> greetings
>> Alessandro
>>
>>
>> On 2/27/07, Ferrer, Eric <er...@transcore.com> wrote:
>> >
>> > Alessandro,
>> >
>> > Did you code around your stall or did you fix the issue causing the
>> > stall.  Sometimes I swear I notice connectivity issues between 3 of
>> the
>> > external database I talk to.  Sometimes the problem self fixes as
>> > connectivity improves but other times we have a dead process that is
>> > waiting on its transaction to complete and is literally stalled on the
>> > query execution remotely.
>> >
>> > Thanks
>> > -Eric
>> >
>> > -----Original Message-----
>> > From: Alessandro Colantoni [mailto:alessandro.colantoni@gmail.com]
>> > Sent: Wednesday, February 07, 2007 4:29 AM
>> > To: OJB Users List
>> > Subject: Re: Connection timeout
>> >
>> > Hi Armin,
>> > thanks the same.
>> >
>> > I asked that because in an application I made a mistake that got in a
>> > stall
>> > :-(
>> > Of course I solved the problem, but I thought that a mistake can
>> occur,
>> > and some resource can keep blocked.
>> > So I thought that if I could set some timeout, at rollback the
>> resource
>> > will
>> > be available again , and the problem could be solved later (for
>> example
>> > during the night) without affecting the user. My application is in
>> > test phase, and I'm sure that now stall are impossible, but you
>> know...
>> > Anyway thanks again for the excellent support you do.
>> >
>> > Greetings
>> > Alessandro
>> >
>> >
>> > On 2/6/07, Armin Waibel <ar...@apache.org> wrote:
>> > >
>> > > Hi Alessandro,
>> > >
>> > > Alessandro Colantoni wrote:
>> > > > Hi all.
>> > > > I'm using ojb1.4 with persistence broker.
>> > > > I would know if there is any way to set a timeout for the broker,
>> so
>> > if
>> > > it
>> > > > doesn't end his job in the timeout limit a rollback is done and an
>> > > > exception
>> > > > thrown.
>> > >
>> > > Sorry no. OJB expects that all PB instances/PB-tx are closed/handled
>> > by
>> > > the user.
>> > >
>> > > regards,
>> > > Armin
>> > >
>> > > > Thanks in advance for the help.
>> > > >
>> > > > Alessandro
>> > > >
>> > >
>> > >
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>>
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