Hi Chesnay,
I actually thought about the same but like you said it seems a bit hacky
;-). Anyway thank you!
Regards,
Lars
Am 08.12.2016 16:47 schrieb Chesnay Schepler:
Hello Lars,
The only other way i can think of how this could be done is by wrapping
the used
outputformat in a custom format, which calls open on the wrapped
outputformat
when you receive the first record.
This should work but is quite hacky though as it interferes with the
format life-cycle.
Regards,
Chesnay
On 08.12.2016 16:39, lars.bachm...@posteo.de wrote:
Hi,
let's assume I have a dataset and depending on the input data and
different filter operations this dataset can be empty. Now I want to
output the dataset to HD, but I want that files are only created if
the dataset is not empty. If the dataset is empty I don't want any
files. The default way: dataset.write(...) will always create as many
files as the parallelism of this operator is configured - in case of
an empty dataset all files would be empty as well. I thought about
doing something like:
if (dataset.count() > 0) {
dataset.write(...)
}
but I don't think thats the way to go, because dataset.count()
triggers a execution of the (sub)program.
Is there a simple way how to avoid creating empty files for empty
datasets?
Regards,
Lars