question Re: Using Oozie Worfklow Expression Language Functions in Hue in Support Questions

Using Oozie Worfklow Expression Language Functions in Hue

_James_ — Tue, 15 Sep 2020 12:07:08 GMT

I have a shell action node that is able to send notifications to a chat application and can be used as a transition route if another action node in the workflow fails. What I'd like to be able to do, is use wf:user() and wf:lastErrorNode() in that notification.

My idea was to pass these values to my shell script as arguments, but when I place 'wf:X()' as the argument to my shell action node, it doesn't resolve to anything and just gives me the raw string as the argument.

Is there a way to use these in a shell action node?

Re: Using Oozie Worfklow Expression Language Functions in Hue

aakulov — Tue, 15 Sep 2020 17:43:57 GMT

Hi James,

Could you share your XML action script for that SSH action?

In general, the following example shows how to pass arguments to your shell (from Oozie docs😞

<workflow-app name="sample-wf" xmlns="uri:oozie:workflow:0.1"> ... <action name="myssjob"> <ssh> <host>foo@bar.com<host> <command>YOURCOMMAND</command> <args>${wf:user()}</args> <args>${wf:lastErrorNode()}</args> </ssh> <ok to="myotherjob"/> <error to="errorcleanup"/> </action> ... </workflow-app>

Note the ${} syntax of the parameter. If this helps, please accept this as a solution.

Regards,

Alex

Re: Using Oozie Worfklow Expression Language Functions in Hue

aakulov — Wed, 16 Sep 2020 19:21:32 GMT

If you are doing this through Hue, please post the generated XML once you submit the job.

Re: Using Oozie Worfklow Expression Language Functions in Hue

_James_ — Thu, 17 Sep 2020 08:17:27 GMT

Hi Alex,

I've resolved the issue. I had been using the wf:X() in the wrong place. Initially I had added an argument for the shell action like ${user} and then set $wf:user() as the value of that argument when submitting the workflow.

I replaced ${user} with the Expression Language Function and the value was resolved automatically and when submitting the workflow I wasn't asked to provide a value for the argument 🙂