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https://issues.apache.org/jira/browse/FALCON-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15195123#comment-15195123
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Pallavi Rao commented on FALCON-1852:
-------------------------------------
It might be hacky, but, that seems to be the only solution (unless someone else
has a better yet simple solution in mind). I will see if can make changes to
create an "empty dir" under the staging path of Falcon
> Optional Input for a process not truly optional
> -----------------------------------------------
>
> Key: FALCON-1852
> URL: https://issues.apache.org/jira/browse/FALCON-1852
> Project: Falcon
> Issue Type: Bug
> Reporter: Pallavi Rao
> Assignee: Pallavi Rao
>
> Currently, when a feed input is marked as optional, we do not add it to the
> coordinator definition's datasets. This means we do not wait for all
> instances (for a given data window) to arrive. Instead, we just resolve the
> paths for a data window and pass it as a parameter.
> For example:
> {noformat}
> <inputs>
> <!-- In the workflow, the input paths will be available in a variable
> 'inpaths' -->
> <input name="inpaths" feed="in" start="now(0,-5)" end="now(0,-1)"/>
> <input name="in2paths" feed="in2" start="now(0,-5)" end="now(0,-1)"
> optional="true"/>
> </inputs>
> {noformat}
> For a process instance 2013-01-01T00:00Z, the optional input, in2paths, will
> be resolved as below:
> {noformat}
> <property>
> <name>in2paths</name>
>
> <value>hdfs://localhost:9000/data/in2/2013/11/15/00/04,hdfs://localhost:9000/data/in2/2013/11/15/00/03,hdfs://localhost:9000/data/in2/2013/11/15/00/02,hdfs://localhost:9000/data/in2/2013/11/15/00/01,hdfs://localhost:9000/data/in2/2013/11/15/00/00</value>
> </property>
> {noformat}
> If one of the instance of in2paths (example,
> hdfs://localhost:9000/data/in2/2013/11/15/00/04) is missing, the workflow
> will fail anyway.
> Hence, input, in2paths is not truly optional. Only that the triggering of
> instance is not gated on it.
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