Hi,

I have no experience with the kinds of problems you are suggesting, but I
would think it would be fairly simple to find out if they are the causes of
what you are seeing: try everything on one box, then try everything on
another box, then try between 2 boxes...

If the problems occur with everything on one machine, even if it is
unplugged from the network, it can't be the hub. I would try a fresh
install of linux, Firebird, Interserver.... on a different machine and see
what happens.


Hope you figure this out soon!

David Jencks

On 2001.04.16 13:03:13 -0400 Ola Samuelson wrote:
> Hi!
> I'll do some test in the line of what you are suggesting.
>
> I know for a fact that only java via interserver on linux dies.
>
> Connections are dying when idle for a few minutes.
>
> Connections doesn't break under use so there is nothing to log.
> I am trying to use them and they are not valid anymore so I have to start
> new
> ones.
>
> Consistency: Same no matter if db is local or remote.
>
> What do you think about my ideas that there is a libc/jdk issue or maybe
> there
> can even
> be something wrong with our switching hubs connecting the
> server/client???
>
> Thanks!
> //OLAS
>
>
>
> David Jencks wrote:
>
> > Hi,
> > what you are seeing is radically different from anything I have
> experienced
> > with any version of interclient.
> >
> > As I mentioned, my connections break after several hours, not minutes.
> The
> > pool I use seems to have no problem discarding broken connections and
> > replacing them immediately with new working ones.
> >
> > Can you tell us...
> >
> > Are the connections breaking under use or when they are unused for
> several
> > minutes?
> >
> > Can you write a simple non pooling program that gets a connection and
> holds
> > onto it, and tests to see if it works after various periods of time?
> (such
> > as having a gui with a button, and you do the timing).
> >
> > If you are using the connections when they break, can you log all the
> sql
> > sent from interserver to interbase? Is there some consistency in what
> is
> > happening when they break?
> >
> > (maybe someone knows another way to log sql, I put
> >
> > errorLog(sqlString);//uncomment to log all sql statements executed
> >
> > as the first line of IB_Statement.cpp methods preparenoinput and
> > preparenoinputnooutput)
> >
> > does this happen consistently on several machines with interbase,
> > interserver, interclient and your client program all on the same
> machine?
> >
> > Thanks
> > David Jencks
> >
> > On 2001.04.15 16:27:05 -0400 Ola Samuelson wrote:
> > > Hi!
> > >
> > > > hours (overnight, 8 hours or so) of disuse the connections break,
> so
> > >
> > > In my case it's a matter of a few minutes and after that the
> connections
> > > are lost which means new ones has to be created. But creating
> > > new ones while old ones are "dying" takes "forever". I goes real fast
> to
> > > create
> > > like
> > > 10 connections the first time.
> > >
> > > I have a connection pool which tries to revive the connections but
> > > even with this the connections that I am reviving(restarting)
> > > are slow. Also, Interserver processes related to dead connections
> > > are not returning memory.
> > > So after a while I have like a few megs avail even with no heavy
> load.
> > > I have 512M in the system and after starting all processes the first
> > > time some 35megs are occupied.
> > >
> > > So the server is spiraling down :-(
> > >
> > > It does not matter if they are constantly used or not.(If i remember
> > > correctly)
> > >
> > > I only use get meta data when starting the connection pool to get
> number
> > > of allowed connections.
> > >
> > > I have not got a clue what's going on.
> > > 1. Connections are dying after a few minutes
> > > 2." connection.isclosed()" does not really tell me if it is closed or
> > > not. I
> > > worked a bit better when I did dummy reads to check
> > > the state of the connection. But this cost to much time.
> > > 3. I am using a pool which many have tried and are extremely happy
> with.
> > > AND I
> > > have tried others as well. So my guess it's not that.
> > > 4. Even with a pool full of what is supposed to be available
> connections
> > > - at
> > > time of use the connection is found dead and
> > > a new one needs to be created. Creation of new ones at this point in
> time
> > > takes
> > > 30 secs sometimes.
> > > 5. there has been some spurious exceptions indicating inability of IC
> to
> > > resolve database url
> > >
> > > Could it be a glibc/jdk/interclient combination problem?
> > > I think I have tried them all by now.
> > >
> > > Right now I am on:
> > > glibc 2.1.3-22(original was 2.1.3-21)
> > > JDK 1.2.2_007(tried all 1.2's from blackdown and suns 1.3.0_02)
> > > Apache Jserv 1.1.2 (got from CVS)
> > > Apache JSSI 1.1.2
> > > Intel PIII SMP machine based on RH6.1 with all updates
> > >
> > > Same behavior even with the db locally so I guess it's not a network
> > > problem.
> > > I have tried setting various tcp parameters with sysctl and it did
> seem
> > > to
> > > improve things
> > > a bit since it kills connections in fin_wait state sooner. And the
> > > interserver
> > > processes
> > > related to dead connections are reported to be in state fin_wait or
> > > time_wait.
> > >
> > > Detail: NIC is Intel EEPRO 100 with Donald Beckers driver from
> february I
> > > think.
> > >
> > > I did compile interserver from cvs a few weeks ago and used it in
> > > conjuction
> > > with
> > > interclient.jar supplied by Joe Shevland(interbase2000.org).
> > >
> > > No difference .........
> > >
> > > Like I said I have tried the db locally no change but the current one
> > > is behind a firewall with filtering and portforwarding allowing
> 3050/tcp
> > > to pass between the machines. The server is running IB 6.01CS on
> linux
> > > smp 2.2.18 kernel. It all worked better when we ran IB 5.6 - on the
> > > server
> > > but we need the 6.01 features so...... Any server side configs that
> > > enables
> > > a remote interserver to work better?
> > >
> > > I find it confirmed after going through and following IC newsgroups
> and
> > > mailinglists for more than 18 months that there are at least three
> > > problems
> > > with all downloadable versions of interclient/interserver:
> > > 1. Dying connections - seen a lot of mail about that one
> > > 2. Interserver eating memory
> > > 3. Inablility to use more than ~20 connections under Linux.
> > > True or false?
> > >
> > > Sorry for my ramblings - ask away if I am being unclear!
> > >
> > > Ideas or questions?
> > > Many thanks in advance.
> > > //OLAS
> > >
> > > PS.
> > > One thing I have noticed: I get a "SIGPIPE" error thrown by
> > > the servlet engine if I transfer more than a few K's from over the
> > > connection.
> > > And this ONLY happens when accessed with Netscape over the web.
> > > Not with IE. I don't know if it's related in any way.
> > >
> > >
> > >
> > >
> > >
> > >
> > > >
> > > > although I encourage you to try my changes I doubt they will
> completely
> > > fix
> > > > the problem. I haven't put up a compiled version, I was waiting
> for
> > > > someone to try it out on windows, and got involved in some other
> stuff.
> > > > You can check out the 2.0 source and find the ant build script in
> the
> > > > firebird directory. Let me know if you have any problems.
> > > >
> > > > Can you be more specific about what is happening? How long before
> the
> > > > connections break? Are you using them all the time or are there
> long
> > > > periods of doing nothing? The problems I know about happen after
> long
> > > > periods of disuse. The problems I fixed were primarily that the
> > > > DatabaseMetaData.getTables(...) call immediately crashed
> interserver.
> > > If
> > > > you are using metadata methods it is very possible that my fix will
> > > help.
> > > >
> > > > Thanks
> > > > David Jencks
> > > >
> > > > On 2001.04.13 16:46:28 -0400 Ola Samuelson wrote:
> > > > > Hi!
> > > > > Sure will try everything ..............
> > > > >
> > > > > Where did you say I can find the updated interclient?
> > > > > TIA
> > > > > //OLAS
> > > > >
> > > > > ft@... wrote:
> > > > >
> > > > > > I think there was a confirmed bug relating to this on Firebird
> > > > > > Sourceforge site (Interbase shuts connection down without
> informing
> > > > > > Interserver). However, the Firebird Interclient 2.00 has been
> > > updated
> > > > > > extensively by David Jencks and can be compiled for Linux.
> There is
> > > a
> > > > > > new Ant build.xml that makes it easy to build the jar and the
> > > > > > Interserver executable. This version needs user feedback before
> > > > > > general release so why not try it.
> > > > > >
> > > > > > Fred
> > > > > >
> > > > > > --- In IB-Java@y..., Ola Samuelson <ola@d...> wrote:
> > > > > > > HI!
> > > > > > > Tried them all ..............JDK's, operating systems,
> > > interclient
> > > > > > kits.
> > > > > > >
> > > > > > > This happens:
> > > > > > > Connections are dying or getting stale after just a few
> minutes.
> > > > > > > Netstat says WAIT on connection between java/interserver.
> > > > > > >
> > > > > >
> > > > > >
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