[rules-users] 答复: 答复: 答复: Concurrent rule fire

[Zhuo Li]

Laun,

 

See below.

 

Thanks

Abe

 

发件人: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] 代表 Wolfgang Laun
发送时间: 2012年1月8日 23:59
收件人: Rules Users List
主题: Re: [rules-users] 答复: 答复: Concurrent rule fire

 

The question of how to handle program failures is not a Drools issue.

Processing transaction data with a RBS isn't much differenf. A

simple analysis must anszwer questions such as

*	Is processing of one transaction in any way dependent on the
processing of previous transactions?

//No. I can get correct result when I re-load and re-process the
transaction.

*	Is it necessary to conserve the results of one transactions in
Working Memory?

//no. we have all transactions’ status recorded in DB when start matching.

*	For a restart: How can you establish check points?

//check points are set to the beginning when system receives transactions.

*	Is it necessary to execute all transactions in one huge bunch?

//not necessary. We have transaction partition set already. Different
regions will go to different instances/ sessions.

*	If one transaction fails, can you recover and continue? How can you
deal with the failed transaction later on?

//I will just load the received transaction and re-process it.

In short - questions that have been asked since the invention of data
processing ;-) But an answer requires - as always - detailed information. 

// I agree with your comments. I guess I misled people here by saying DR…
what I really want to know is just if Drools will prevent firing the same
rules against the same working memory concurrently…

 

-W

 

 

2012/1/8 Zhuo Li <milanello1998 at gmail.com>

That is my question actually. Say if I have one rule which is scheduled to
run twice a day, what about if the first schedule failed and got restarted,
but when the first job is still running, the second job’s schedule time
arrives. Will the second schedule wait for first to finish?

 

Best

Abe

 

发件人: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] 代表 Nicolas Héron
发送时间: 2012年1月8日 23:08
收件人: Rules Users List

主题: Re: [rules-users] 答复: Concurrent rule fire

 

Hi,


You can use more than one drools session ?
Regards
Nicolas Héron

2012/1/8 Zhuo Li <milanello1998 at gmail.com>

Any comments?

 

发件人: Zhuo Li [mailto:milanello1998 at gmail.com] 
发送时间: 2012年1月8日 0:35
收件人: 'Rules Users List'
主题: Concurrent rule fire

 

Hi, folks,

 

My project will handle about 1.5 M transactions per hour using Drools and
the rules’ fire are scheduled based on business operation cycle which might
happen a few times a day. Say if I need to fire the same rule set twice at
10:00 PM and midnight. What will happen if the first execution has not
completed till midnight? Will the 2nd execution be held up till the 1st is
completed? I would assume there might still be transactions inserted into
working memory between 10:00 PM and midnight although it is very few.

 

My understanding is Drools will enforce only one active thread is working
for the same “then” section for data consistency. Any thoughts?

 

Best

Abe


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