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Introduction
In version 3.0
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of
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Pentaho
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Data
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Integration
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we
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allow
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you
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to
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execute
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a
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job
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you
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defined
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on
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a
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(remote)
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slave
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server.
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This
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page
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explains
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how
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to
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set
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this
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up
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and
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what
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to
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look
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out
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for.
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Basics
In a typical ETL setup, you might come across the need to fire off a job on a remote server somewhere. Version 3.0 of PDI is the first one to allow this.
Here is how you do it: you define a Slave Server in your job and specify the slave server on which you want to run the job on like this:
Possible problems
Referenced objects are not found
One of the first problems you will encounter is that ONLY the job itself is sent to the slave server for execution, not the referenced files, transformation, mappings, sub-jobs, etc.
SOLUTION 1: specify the correct files as they exist on the remote system. It might be tricky to test your jobs and transformations locally.
SOLUTION 2: Use a shared drive that is mapped locally and remotely so that you can make changes to the transformations and jobs easily. The drawback is that it's usually a hassle to set this up or to make sure the referenced paths are exactly the same on the remote system. (drive letters, mount paths, etc). If you do use this system, we make it easy for you because the referenced path of the local job file is send to the slave server for reference.
SOLUTION 3: Put all the referenced files into a zip file, let's call it "bigjob.zip". Reference all files relative to on another using variables like ${Internal.Job.Filename.Directory}
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or
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${Internal.Transformation.Filename.Directory}
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That
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way
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you
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just
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have
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to
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transfer
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the
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file
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to
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the
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remote
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server
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(FTP,
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SFTP,
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etc).
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You
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can
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specify
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the
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location
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of
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the
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root
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job
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like
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this:
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| Code Block |
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zip:file:///tmp/bigjob.zip!/MainJob.kjb
{code}
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Note
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that
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the
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zip
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file
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can
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be
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located
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anywhere,
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even
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on
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a
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web
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server.
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The
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URL
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for
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the
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root
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job
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then
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simply
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changes
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to:
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| Code Block |
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zip:http://ww.foo.com/bar/bigjob.zip!/MainJob.kjb
{code} |
Repository access is not available on slave server
Because the repository login credentials where not yet sent over "the wire" we could not offer a solution for this problem in version 2.5.x.
Version 3.0.0 fixes this issue by passing the repository name, user name and password to the slave server.
Please note that the slave server has to be aware of the location of the repository. Normally, the file $HOME/.kettle/repositories.xml is referenced for this. However, you can also copy this file into the directory in which you started Carte (the local directory).
Even if you set this up correctly, verify that the slave server can reach the repository database over the network and that the repository database contains permissions for the slave server to access it.