topic Activity Clustering in Alfresco Archive https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129080#M90694 <HTML><HEAD></HEAD><BODY><SPAN>Hello guys,</SPAN><BR /><BR /><SPAN>After googling couple of weeks for open source workflow engine,finally we have decided to</SPAN><BR /><SPAN>use ACTIVITY over JBPM.The main reason behind this is clustering, since ACTIVITY is stateless it supports clustering .</SPAN><BR /><SPAN>I have couple of questions related to clustering approach.</SPAN><BR /><BR /><SPAN>1.For scalability reason we are going with EJB3 as compared to spring(Correct me if i am wrong). Our architecture will be as follows,</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a. We are having four nodes with load balancer</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b. Each node will be having pool of EJBs.</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c. Each node will have one instance of ProcessEngine by using singleton pattern that will be used by all EJB on particular node.</SPAN><BR /><BR /><SPAN>As per my understanding ProcessEngine is thread safe so there will be no problem if multiple threads access</SPAN><BR /><SPAN>ProcessEngine at same time but my concern is what about scalability.We have chosen EJB for scalable purpose</SPAN><BR /><SPAN>but if multiple call on single instance of&nbsp; ProcessEngine,will it scale.</SPAN><BR /><BR /><SPAN>2.Can we have multiple instance of ProcessEngine per node.I mean whenever there is need to interact with processEngine can we create instance and</SPAN><BR /><SPAN>destroy it.create and destroy as per request basis like normal java classes. Will be there any performance overhead</SPAN><BR /><SPAN>in creating and destroying ProcessEngine multiple time.</SPAN><BR /><BR /><SPAN>3.Any suggestions on other architecture.</SPAN></BODY></HTML> Fri, 19 Apr 2013 13:18:01 GMT dsagar1234 2013-04-19T13:18:01Z Activity Clustering https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129080#M90694 Hello guys,After googling couple of weeks for open source workflow engine,finally we have decided touse ACTIVITY over JBPM.The main reason behind this is clustering, since ACTIVITY is stateless it supports clustering .I have couple of questions related to clustering approach.1.For scalability reason Fri, 19 Apr 2013 13:18:01 GMT https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129080#M90694 dsagar1234 2013-04-19T13:18:01Z Re: Activity Clustering https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129081#M90695 <HTML><HEAD></HEAD><BODY><SPAN>1. Each API call to the engine happens in the calling thread and very few synchronized resources are used in activiti. So the scalability of the engine depends on the number of threads available and the speed of the Database used.</SPAN><BR /><BR /><SPAN>2. Creating and destroying instances of the engine has a performance penalty since it builds up all classes needed for execution and holds some internal caches as well. Having to create a new one for each request is a bad idea…</SPAN></BODY></HTML> Mon, 22 Apr 2013 07:10:58 GMT https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129081#M90695 frederikherema1 2013-04-22T07:10:58Z Re: Activity Clustering https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129082#M90696 <HTML><HEAD></HEAD><BODY><SPAN>Sounds good. Just put your process engine in jndi for example and let it boot/shutdown toigether with the container.</SPAN></BODY></HTML> Mon, 22 Apr 2013 10:03:18 GMT https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129082#M90696 jbarrez 2013-04-22T10:03:18Z Re: Activity Clustering https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129083#M90697 <HTML><HEAD></HEAD><BODY><SPAN>Thanks a lot guys.</SPAN></BODY></HTML> Mon, 22 Apr 2013 13:08:29 GMT https://connect.hyland.com/t5/alfresco-archive/activity-clustering/m-p/129083#M90697 dsagar1234 2013-04-22T13:08:29Z