It sounds like your custom processor is generating files on disk, does
it output any flow files, perhaps one flow file per generated on-disk
file? If for each file generated on disk, the custom processor could
output a flow file with the "absolute.path" and "filename" attributes
set, that kind of emulates a ListFile processor, so after your custom
processor you could go directly to a FetchFile (or FetchHDFS or
whatever) processor.  That keeps the flow serial rather than ListFile
running concurrently with your processor generating files.  If I've
misunderstood anything please let me know.

Regards,
Matt

On Tue, May 9, 2017 at 7:20 AM, Vdsa <[email protected]> wrote:
> I have a custom processor which generates some files, listFile takes those
> files and moves those files to HDFS, when I run a processor group it starts
> executing all the processors and as list file is independent of any input it
> starts fetching file and it does not get that. Thus i get error that file
> does not exist. How do I wait processor till the time i get files?
>
>
>
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