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Posted to slide-user@jakarta.apache.org by Scott Lewis <sl...@egrantsho.cayuse.com> on 2005/05/25 00:09:39 UTC
Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Greetings Sliders,
We are working with/using the Slide libraries (2.1RC1) on Tomcat (v
5.0.28 currently). We are having what seems to be a deadlock condition
inside the Slide server code.
A couple of questions come up:
1) Is there are more recent version of Slide that is available? (i.e.
2.1 RC1 has been out for some time).
2) Does anyone on this list (or others) know of this deadlock bug and
have a fix?
3) Is there a version of Slide that runs on 5.5 (jvm 1.5)?
The 1.5 vm has some support for deadlock detection which we could use to
help figure out where the problem is if necessary/appropriate, but we
would need to have a version of slide that runs on jvm 1.5/tomcat
5.5/slide X.X.
Thanksinadvance for any info and/or pointers.
Scott
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Re: Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Posted by Martin Kalén <mk...@apache.org>.
Scott Lewis wrote:
> Is there a version of Slide that runs on 5.5 (jvm 1.5)?
P.S. Slide kernel from CVS HEAD runs fine under Tomcat 5.5.x,
at least with JRE 1.4 and the Tomcat compatibility JAR installed.
I have not tried with either JRE 5.0 or the Slide WebDAV servlet.
Regards,
Martin
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Re: Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Posted by Martin Kalén <mk...@apache.org>.
Scott Lewis wrote:
> I'm not using RDBMS at all...just FileSystemStore (or whatever the class
> name is), so it sounds like this probably isn't the same thing.
OK. No, then I don't think it is related since "my" deadlock has to do
with transaction isolation between the two different DBCP pools.
> Thanks though.
NP! :)
Cheers,
Martin
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Re: Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Posted by Scott Lewis <sl...@egrantsho.cayuse.com>.
Hi Martin,
I'm not using RDBMS at all...just FileSystemStore (or whatever the class
name is), so it sounds like this probably isn't the same thing.
Thanks though.
Scott
Martin Kalén wrote:
> Scott Lewis wrote:
>
>> We are working with/using the Slide libraries (2.1RC1) on Tomcat (v
>> 5.0.28 currently). We are having what seems to be a deadlock
>> condition inside the Slide server code.
>
>
> Are you using different RDBMS-based stores pointing to the same database?
>
> I have a reproducable case where Slide from CVS HEAD (pre-2.2) deadlocks
> if permissions for two stores are configured to the same DB through
> DBCP pools in each store.
>
> (My usage pattern is that I share permissions in DB but have content for
> one URL-tree on disk and content for another URL-tree in RDBMS.)
>
> When Slide loads the initial permissions entries from Domain.xml on
> a blank DB it will deadlock when it tries to grant permission on one
> store and calls assertUri for the root note just created by the other
> store.
>
> I haven't had time to debug this further or work on a patch, but you
> can easily verify if your condition is similar by starting Tomcat in
> JPDA debug mode, attach a debugger with the Slide source code available
> and check if the deadlock is in a executeUpdate call to your JDBC driver
> called from grantPermission and assertUri on top of that in the stack.
>
> Regards,
> Martin
>
>
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Re: Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Posted by Martin Kalén <mk...@apache.org>.
Scott Lewis wrote:
> We are working with/using the Slide libraries (2.1RC1) on Tomcat (v
> 5.0.28 currently). We are having what seems to be a deadlock condition
> inside the Slide server code.
Are you using different RDBMS-based stores pointing to the same database?
I have a reproducable case where Slide from CVS HEAD (pre-2.2) deadlocks
if permissions for two stores are configured to the same DB through
DBCP pools in each store.
(My usage pattern is that I share permissions in DB but have content for
one URL-tree on disk and content for another URL-tree in RDBMS.)
When Slide loads the initial permissions entries from Domain.xml on
a blank DB it will deadlock when it tries to grant permission on one
store and calls assertUri for the root note just created by the other
store.
I haven't had time to debug this further or work on a patch, but you
can easily verify if your condition is similar by starting Tomcat in
JPDA debug mode, attach a debugger with the Slide source code available
and check if the deadlock is in a executeUpdate call to your JDBC driver
called from grantPermission and assertUri on top of that in the stack.
Regards,
Martin
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Re: Deadlock in Slide 2.1 RC 1 /Tomcat 5.0.29
Posted by Unico Hommes <un...@apache.org>.
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Hash: SHA1
Scott Lewis wrote:
> Greetings Sliders,
>
> We are working with/using the Slide libraries (2.1RC1) on Tomcat (v
> 5.0.28 currently). We are having what seems to be a deadlock condition
> inside the Slide server code.
> A couple of questions come up:
> 1) Is there are more recent version of Slide that is available? (i.e.
> 2.1 RC1 has been out for some time).
You could check the download section on our site:
http://jakarta.apache.org/slide/download.html
> 2) Does anyone on this list (or
> others) know of this deadlock bug and have a fix?
There's a wealth of information in the mailing list archives you could
try searching there. As an example here are the mails to slide-dev that
contain the word "deadlock":
http://marc.theaimsgroup.com/?l=slide-dev&w=2&r=1&s=deadlock&q=b
> 3) Is there a version
> of Slide that runs on 5.5 (jvm 1.5)?
Don't know the answer to that one.
- --
Unico
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