[jboss-jira] [JBoss JIRA] Updated: (JBRULES-792) Some "collect" rules cause hang during assertion

[Dirk Bergstrom (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-792?page=all ]

Dirk Bergstrom updated JBRULES-792:
-----------------------------------

    Attachment: drools-bug-no-libs.tgz

A drastically pared-down version of my app that demonstrates the bug.  It's an eclipse project, just add a "lib" directory containing the following:

antlr-3.0b7.jar
core-3.2.1.v_677_R32x.jar
drools-compiler-4.0.0.SNAPSHOT.jar
drools-core-4.0.0.SNAPSHOT.jar
janino-2.5.5.jar
log4j-1.2.14.jar
mvel14-1.2beta16.jar

It asserts ten User objects, then hangs while asserting the third PRRecord object.

> Some "collect" rules cause hang during assertion
> ------------------------------------------------
>
>                 Key: JBRULES-792
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-792
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 4.0.0.MR2
>            Reporter: Dirk Bergstrom
>         Assigned To: Edson Tirelli
>         Attachments: drools-bug-no-libs.tgz, stacktraces.txt
>
>
> Some combinations of collect rules and objects result in an endless
> busy loop during assertion (100% CPU usage for 18 hours and counting).
> The problem doesn't happen for every object, but it is repeatable for
> a given object.
> For instance, with the following rule:
> rule "Find all RLIs for user"
> when
>   $user : User( )
>   $rli_list : RecordSet( size > 0 ) from
>    collect( RLIRecord( $resp : responsible -> ( $user.hasReport($resp) ) ) )
> then
>  $user.setRecords($rli_list, DataSource.RLI);
> end
> With 92 Users asserted, my code asserts the first 1368 RLI objects at 6-8
> miliseconds per assertion, then hangs hard on #1369 (always the same
> object).  It has sat there occupying a cpu full time for the last 18
> hours, with no visible progress.
> On the other hand, with these two rules:
> when
>   $release : ReleaseRecord( $relname : relname )
>   $user : User( )
>   $pr_list : RecordSet( size > 0 ) from
>    collect( PRRecord( releases contains $relname,
>     $resp : responsible -> ( $user.hasReport($resp) ) ) )
> then
>  $user.setRecords($pr_list, $release, DataSource.GNATS);
> end
> rule "Find all PRs for user"
> when
>   $user : User( )
>   $pr_list : RecordSet( size > 0 ) from
>    collect( PRRecord( $resp : responsible -> ( $user.hasReport($resp) ) ) )
> then
>  $user.setRecords($pr_list, DataSource.GNATS);
> end
> With 92 Users and 37 ReleaseRecords asserted, I can assert all 10600
> PR objects, at between 10 and 100 msec per (it slows down a bit
> towards the end).  Then on the next cycle the app asserts several
> hundred more User objects, and later asserts another 1500 Users,
> without a hitch.
> If need be, I have examples of other rule/object combinations that do
> and don't work.  Note that a version of the RLIRecord class is
> attached to JBRULES 740.
> I'm using trunk, at revision 108xx -- forgot to note the exact
> revision, but it includes tirelli's hashcode caching, and a few other
> changes after that.
> This is a follow-on to JBRULES 740.

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