Hi Shazni, To my knowledge, if we have 10 nodes in the cluster and the taskServerCount in the task-config.xml is 5, the initial task scheduling will happen only if the minimum of 5 nodes are up. A task could not be duplicated in multiple servers if the configuration registry correctly shared among the cluster nodes. It is better if we can configure taskServerCount exactly matching nodes count in the cluster. However, I don't think it's a must.
Further, there can be task duplications in Hazelcast split-brain situations. To overcome that, we might need to optimize hazelcast configurations by placing hazelcast.properties in the <EI_HOME>/conf/ directory. Document [1] has some details on Hazelcast related configurations. [1]. https://docs.wso2.com/display/CLUSTER44x/Overview Thanks, Vijitha On Mon, Sep 10, 2018 at 3:16 PM Shazni Nazeer <[email protected]> wrote: > Thank Vijitha.Few more clarifications. > > Does this mean if we have 10 nodes in the cluster and if we specify 5 for > the *taskServerCount*, then task scheduling only works only if minimum 5 > nodes are up? > And in this case, does it make sure the scheduled task runs only in 1 node > of 10? > Or do you say that since 10 nodes are there in the cluster we need to > configure this property to 10 make it execute in only one node at a t9ime? > > On Mon, Sep 10, 2018 at 1:18 PM Vijitha Ekanayake <[email protected]> > wrote: > >> Hi Shazni, >> >> AFAIK, the taskServerCount value specifies the number of nodes in the >> cluster, which basically represents the number of server instances that >> will share the task scheduling. Task scheduling will only begin after the >> given number of servers are activated. Task framework ensures to execute >> any given task only in a single node in the cluster. >> >> Since EI doesn't have worker/manager deployment, The value for the >> *taskServerCount >> *on two node EI cluster should be 2. I think we require documentation >> update here. >> >> Thanks, >> Vijitha. >> >> On Mon, Sep 10, 2018 at 11:57 AM Shazni Nazeer <[email protected]> wrote: >> >>> Hi, >>> >>> I would like to know the recommendation on taskServerCount in the >>> task-config.xml as outlined in the document [1]. In a two-node EI, for >>> a scheduled task to not duplicate we need axis2 (hazelcast) clustering >>> enabled right? >>> >>> And what's the recommended value on this scenario for the >>> taskServerCount? Does keeping it 1 cause the teaks to duplicate? >>> >>> [1] >>> https://docs.wso2.com/display/ADMIN44x/Configuring+the+Task+Scheduling+Component >>> >>> -- >>> Shazni Nazeer >>> >>> Mob : +94 777737331 >>> LinkedIn : http://lk.linkedin.com/in/shazninazeer >>> >>> Blogs : >>> >>> https://medium.com/@mshazninazeer >>> http://shazninazeer.blogspot.com >>> >>> <http://wso2.com/signature> >>> >> >> >> -- >> Vijitha Ekanayake >> Senior Software Engineer*, *WSO2, Inc.; http://wso2.com/ >> Mobile : +94 777 24 73 39 | +94 718 74 44 08 >> lean.enterprise.middleware >> > > > -- > Shazni Nazeer > > Mob : +94 777737331 > LinkedIn : http://lk.linkedin.com/in/shazninazeer > > Blogs : > > https://medium.com/@mshazninazeer > http://shazninazeer.blogspot.com > > <http://wso2.com/signature> > -- Vijitha Ekanayake Senior Software Engineer*, *WSO2, Inc.; http://wso2.com/ Mobile : +94 777 24 73 39 | +94 718 74 44 08 lean.enterprise.middleware
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