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https://issues.apache.org/jira/browse/NIFI-583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526958#comment-14526958
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Ricky Saltzer commented on NIFI-583:
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[~Toivo Adams]
There's a processor meant for doing exactly that (ExecuteStreamCommand). The
problem with using this processor for executing one off OS commands is that the
executing command must be able to disregard STDIN. The ExecuteProcess command
would be useful if it could also completely disregard the incoming FlowFile's
contents, while at the same time consuming it (taking it out of the channel).
Ricky
> Allow ExecuteProcess to consume an incoming flowfile
> ----------------------------------------------------
>
> Key: NIFI-583
> URL: https://issues.apache.org/jira/browse/NIFI-583
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Ricky Saltzer
>
> In some cases it would be really nice to allow a FlowFile to trigger an OS
> action. For instance, after a daily dump of data is written to an Impala
> table in HDFS, I would like to execute a refresh on the table via the shell.
> As it stands, the ExecuteProcess processor will allow a FlowFile in a
> connection to trigger execution, but unless your connection has an expiration
> set, the FlowFile will stay there indefinitely. The main issue here is that
> it will continue to re-execute your ExecuteProcess processor over and over.
> As far as I know, there's only two clear ways around this. (1) - you can use
> the ExecuteStreamCommand, instead, but *only* if that command can properly
> handle STDIN. (2) - you can set your ExecuteProcess processor to execute on a
> schedule (e.g. 1 per minute) and expire the FlowFile before it can re-execute
> (e.g. 10 seconds).
> It would be useful if the ExecuteProcess processor consumed the FlowFile, and
> passed it through a "passthrough" relationship of some kind. A second option
> would be to make it configurable (false by default) to drop the FlowFile, or
> to pass it through a second relationship, that way it doesn't break anyone's
> current pipelines.
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