[jira] [Created] (FALCON-1852) Optional Input for a process not truly optional

["Pallavi Rao (JIRA)" <ji...@apache.org>]

Pallavi Rao created FALCON-1852:
-----------------------------------

             Summary: 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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