In Talend Open Studio, how do I execute only one of my components? If I click Run, all active components will run. So far the only way I know to execute a single component is to deactivate all others in the Job.
How can I execute one component or subjob without having to deactivate all the other components in the job?
Well, I'm afraid you can't.
Two possible solutions :
Deactivating unwanted components / subjobs (like you already stated)
Decompose your job into multiple jobs. This may give you more flexibility. You can then use the tBufferOutput component to pass information from the child job to his parent.
Related
I am trying to implement parallelization within talend. I have it working, but now I don't know how to connect the parallelization work to the next part. Usually, you would click on the previous block and select OnSubjobOk. That option doesn't appear. Is there another component that I need to add that I don't know about?
Under the basic settings of tParallelize you would find the option Wait For. This have two options -
end of first subjob: sequence the relevant subjob to be executed at
the end of the first subjob
end of all subjobs: sequence the relevant subjob to be executed at the end of all
subjobs.
So, all you have to do is connect your next part - your sub job with the tParallelize component by selecting the trigger - synchronize(wait for all). This would ensure once all the parallel subjobs/components are executed the sub job connected with synchronize(wait for all) will be executed.
My company has a couple of joblets that we put in new jobs to do things like initialization of variables, get system information from the database and sending out error / warning emails. The issue we are running into is that if we go ahead and start creating the components of a job and realize that we forgot to include these 3 joblets, we have to basically re-create the job to ensure that the joblets are added first so they run first.
Is there any way to force these joblets to run first and possibly also in a certain order before moving on to the contents of the job being created? Please let me know if there is any information you may need that I'm missing as I have only been using Talend for a few days. The rest of the team has not been using it too much longer than I have, so they do not have the answer I'm looking for either. Thanks in advance!
In Joblets you can use the components Trigger_Input and Trigger_Output as connection-points for on subjob OK triggers. So you can connect joblets and other components in a job with triggers. Thus enforcing execution order.
But you cannot get a on subjob OK trigger from a tPreJob. I am thinking on triggering from a tPreJob to a tWarn (on component OK) and then from tWarn to the joblet (on subjob OK).
I am exploring Talend at work, I was asked if Talend supports batch processing as in running the job in multiple threads. After going through the user guide I understood threading is possible with sub jobs. I would like to know if it is possible to run the a job with a single action in parallel
Talend has excellent multi threading support. There are two basic methods for this. One method gives you more control and is implemented using components. The other method is implemented as job setting.
For the first method see my screenshot. I use tParallelize to load three files into three tables at the same time. Then when all three files are successfully loaded I use the same tParallelize to set the values of a control table. tParallelize can also be connected to tRunJob as easily as a subjob.
The other method is described very well here in Talend Help: Talend Help- Run Jobs in Parallel
Generally I recommend the first method because of the control it gives you, but if your job follows the simple pattern described in the help link, that method works as well.
I need to know that how can we run a single job in parallel with different parameters in talend.
The answer is straightforward, but rather depends on what you want, and whether you are using free Talend or commercial.
As far as parameters go, make sure that your jobs are using context variables - this is the preferred way of passing parameters in.
As for running in parallel, there are a few options.
Talend's studio is a java code generator, so you can export your job (it's just java code) and run it wherever you want. How you invoke it is up to you - schedule it, invoke it N times manually, your call. Obviously, if your job touches shared resources then making it safe to run in parallel is up to you - the usual concurrency issues apply.
If you have the commercial product, then you can use the Talend admin centre (TAC). The TAC allows you to schedule a job more than once with different contexts. Or, if you want to keep the parallelization logic inside your job, then consider using the tParallelize component in one job to run another job N times.
I have 7 workflow that need to execute; that need to run in certain order ? Is there any scheduling service for this in wf4 or any other approach i can use?
Ocean
If you need to run them sequentially in a certain order, why not just create another workflow and put all 7 of your workflows as activities in a top sequential activity?
If you create an activity that derives fron NativeActivity you can schedule child activities in any order you like. That is the closest thing to a "SchedulerService" I can think of.
However you have to know the activites you want to run at compile time. You can only arrange the order differently using this approach.
If you don't know which activities you want to use at compile time you could use a parent/child technique I showed on my blog WF4 How To Invoke a Child Workflow as XAML