Hi, I'm new to Talend and I have a couple of questions regarding tRunjob. I'd like to know if it's possible to pass a data flow to a tRunjob to compute, and if it is, what's the component used as an input in the child job. Regards, ml
Passing data to a client job is usually done with a context. If you look at the component properties you can see that you can set context variables of your sub job. Before you do so you need to declare a context in your sub job. You can for example dump your data into a file, communicate the file name to the sub job as context variable, open the file in your sub-job and process the data, store the output in a tBufferOutput, return the buffer to the parent job and continue the processing in your parent job with a flow from the job icon (the data comes from your buffer). I think there is no interactive communication between parent and sub job. Does passing down the data fulfil your requirement?
Actually, I don't want to generate any temporary file. I've already thought about the context variables, but I want to use some components like tAggregate on the input flow in the subjob. So the link between the father and the child must be a data flow, it's like using a main row that will be between a component in the father job and the tRunjob.
I want to split one huge Job into 2 jobs, with the upper part working as a father job and the lower one as a child Job. The splitting must be at the data flow coming from the filter. Thanks for your time.
I can?t see your picture. The parent job is not running when TOS is executing the sub-job (at least that?s my understanding) therefore I don?t see how you could establish a flow between them. Sometimes I?m complicating things because I like to have them well organized. Are you sure it?s the best approach to split your work in two parts if the different parts need to talk to each other? Seeing your picture would probably answer my question. My firewall is very restrictive on displaying images, would it be possible for you to use the forum picture attachment functionality instead of in-text linkage?
My problem is that my firewall is blocking common image provider. I will not see your picture if it is hosted outside of the forum. Do you have seen the functionality to direct upload the image with your post?
The parent job is not running when TOS is executing the sub-job (at least that?s my understanding) therefore I don?t see how you could establish a flow between them.
Yes, Vaiko is right. The father job is not running when you execute the child job. Generally speacking, one job is created for one function and use servel tRunJob to run father job and all the chird jobs continuity. Spliting the function in different jobs is not stable and readable. Best regards shong
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Your job looks quite complex. What I did in the past was a data modification tracking job which is comparing data, line by line, for several databases and schemas. But I?m not sure it relates to your situation. I stored the differences (mainly the sql queries) in a configuration file. I dumped the output of the queries into temporary files. After this generalisation I was able to code the job with only few components because the differences where encapsulated in the files. The processing sub-job was run as a loop for every line in the configuration file. My personal feeling is that TOS jobs should use temporary files a lot. In some cases it really simplifies the job design and I think file processing is so fast that it may not worth to try to keep the data in memory.
Actually I took the context variables solution, I use a tFlowToIterate to transform the flow into and iteration and I store it into a context variable that I process into a child job that I call 2 times: one for each branch from the filter. Thank you for your answers. Regards.