#612: Support for "Task Dependencies" in BibSched
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Reporter: boltmann | Owner:
Type: enhancement | Status: new
Priority: major | Milestone:
Component: BibSched | Version:
Keywords: |
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For the new module handling videos in Invenio ("BibEncode") we need
support for task dependencies in BibSched. There should be a parameter
upon task submission that defines an execution dependency on another task
that is currently running.
"BibEncode" has a daemon mode that launches multiple other "BibEncode"
tasks for transcoding and other stuff defined by a submission.
Let us say that one of these tasks ("A") moves a video file and alters the
metadata of the video.
Other "BibEncode" tasks ("B", "C") are going to trancode the video
afterwards and extract thumbnails from it.
"B" and "C" cannot be executed before the videos was moved and altered by
task "A".
On submission of "B" and "C" a parameter should be settable that means "do
not start before task "A" has been executed successfully".
One possible way would be to have the task resubmit itself in case that
the task it depends upon was not yet successfully executed.
This is different from the the "postprocess" approach because multiple
tasks, possibly in parallel, need to be run.
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Ticket URL: <https://invenio-software.org/ticket/612>
Invenio <http://invenio-software.org>
