I have a pentaho transformation which is consist of, for example, 10 steps. I want to start this job for N input parameters but not in parallel, each job evaluation should start after previous transformation are fully completed(process done in transaction and commited or rollbacked). Is it possible with Pentaho?
You can add 'Block this step until steps finish' from Flow to your transformation. Or you can mix 'Wait for SQL' component from Utility with loop on your job.
Regards
Mateusz
Maybe you must do it using jobs instead of transformations. Jobs only run on sequence while transformations run on parallel. (Truly, a transformation has a initialize phase whose run is in parallel and then the flow runs sequentially).
If you can't use jobs, you always can do what Matusz said.
Related
Now I have a pentaho job using shell script to process some data.
But I found if I want to use the result in the script, I had to write that into a file and read the file to asign variables.
Is there an esaier way to use the result of a script step in the following steps?
This is the Script content.
Here is the whole process.
In pentaho you cannot create a variable and used in the same place.
Basically you just need to create one ktr and one job:
the first one is in charge of perform some task and save the variable with set-variable step (root job level option)
variables created in the first ktr are also available at job level
If you want to use the variable in another ktr
the second ktr, at the beginning should use the get-variable step to retrieve the variable created in previous transformation
transformations should be executed sequentially using a job
In your case, you should run the shell in the first ktr, transform the result into a variable and save it using set-variable. Your job which invokes the ktr, are able to use the variable create in the previous ktr
I created ControlM job with all required parameters(named PARM1, PARM2, PARM3). I able to Order the job and under Monitoring section when i try to run the job the parameters i set while creating job are not passing to script.
May i know why the parameters are not passing to script?
Could you specify what kind of Job you are designing?
Job's type could be determining this behavior.
It is important to consider this aspect. For example, if the Job type is OS Script then Control-M will send the values of the 3 parameters at the indicated positions. However, if the Job is of type OS Command then you must specify, yourself, those parameters in the command line to execute.
For example, in the What specification of the command you should write:
thecommnad %%PARM1 %%PARM2 %%PARM3
I am new with kettle so I am going to run the 3 kettle script 1.ktr,2.ktr,3.ktr one after other.
Can someone give me the idea how to achive this using kettle steps.
usually, you organize your kettle transformations within kettle jobs (.kjb). In those jobs you can have transformations being processed one after the other. You can also include jobs within jobs to further organize your ETL process. If you execute your jobs and transformations from the command line, please be aware that you execute transformations with the tool kitchen, transformations with pan. You can create jobs like you can create transformations, with spoon.
Ideal way is to use Jobs. Jobs guarantee sequential execution when you put them in sequence unlike a transformation calling multiple transformations through transformation executor (where it goes in parallel)
Create a wrapper job with Start -> (transformation step) KTR1 -> (transformation step) KTR2 -> (transformation step) KTR3 -> Success and run this job.
Create a job. Drag three "Transformation" steps in that job. Check this out:
You can add as many transformations you want in a job. When you will run this job, it will execute the transformations one by one.
Introduction
To keep it simple, let's imagine a simple transformation.
This transformation gets an input of 4 rows, from a Data Grid step.
The stream passes through a Job Executor, referencing to a simple job, with a Write Log component.
Expectations
I would like the simple job executes 4 times, that means 4 log messages.
Results
It turns out that the Job Executor step launches the simple job only once, instead of 4 times : I only have one log message.
Hints
The documentation of the Job Executor component specifies the following :
By default the specified job will be executed once for each input row.
This is parametrized in the "Row grouping" tab, with the following field :
The number of rows to send to the job: after every X rows the job will be executed and these X rows will be passed to the job.
Answer
The step actually works well : an input of X rows will execute a "Job Executor" step X times. The fact is I wasn't able to see it with the logs.
To verify it, I have added a simple transformation inside the "Job Executor" step, which writes into a text file. After I have checked this file, it appeared that the "Job Executor" was perfectly executed X times.
Research
Trying to understand why I didn't have X log messages after the X times execution of "Job Executor", I have added a "Wait for" component inside the initial simple job. Finally, adding two seconds allowed me to see X log messages appearing during the execution.
Hope this helps because it's pretty tricky. Please feel free to provide further details.
A little late to the party, as a side note:
Pentaho is a set of programs (Spoon, Kettle, Chef, Pan, Kitchen), The engine is Kettle, and everything inside transformations is started in parallel. This makes log retrieving a challenging task for Spoon (the UI), you don't actually need a Wait for entry, try outputting the logs into a file (specifying a log file on the Job executor entry properties) and you'll see everything in place.
Sometimes we need to give Spoon a little bit of time to get everything in place, personally that's why I recommend not relying on Spoon Execution Results logging tab, it is better to output the logs to a DB or files.
I have a SQL Server Agent Job with 4 steps. If I run it, it displays as "Executing" indefinitely. If I run the code in the four steps sequentially directly into SSMS, they take ~7 seconds to execute. No configuration information (owner, run as, database, etc.) differs from any other Job that runs normally. What else can I examine?
As with any problem that comes in a group, break it down to it's individual parts. You have run each step separately and you know each individual step works. Next, add step 1 and 2 and see if it runs. Next add step 1,2 and 3 and see what happens. Eliminate all the possible issues step by step. My guess is that one step is not returning a success and the error logic on it does not say to fail or move to the next step.
Check the properties on each step under advanced and check the On success and On Failure actions.