[jira] [Created] (AIRFLOW-3542) next_ds semantics broken for manually triggered runs

["Dan Davydov (JIRA)" <ji...@apache.org>]

Dan Davydov created AIRFLOW-3542:
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             Summary: next_ds semantics broken for manually triggered runs
                 Key: AIRFLOW-3542
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3542
             Project: Apache Airflow
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 1.10.2
            Reporter: Dan Davydov
            Assignee: Dan Davydov


{color:#222222}next_ds{color}{color:#222222} is useful when you need cron-style scheduling, e.g. a task that runs for date "X" uses that date for its logic, e.g. send an email to users saying the run that was supposed to run for date "X" has completed. The problem is it doesn't behave as expected when it comes to manually triggered runs as illustrated by the diagrams below.{color}
 
Using execution_date in a task
*Scheduled Run (works as expected)*
execution_date1           start_date1
\/                                  \/
 *|-----------------------------|*
/\                                  /\
 \_________________/
   scheduling_interval
 
*Manual Run* *(works as expected)*

triggered_date + execution_date + start_date
\/
*|*
 
Using next_ds in a Task
*Scheduled Run (works as expected)*
next_ds1 + start_date1           next_ds2 + start_date2
\/                                                         \/
 *|------------------------------------------------|*
/\                                                         /\
 \____________________________/
             scheduling_interval
 
*Manual Run* *(next_ds1 is expected to match triggered_date as in the case for the manually triggered run that uses the regular execution_date above)*
triggered_date                                    next_ds1 + start_date
\/                                                         \/
*|-------------------------------------------------|*
/\                                                         /\
 \____________________________/
             0 to scheduling_interval (depending on when the next execution date is)
Proposal
Have next_ds always set to execution_date for manually triggered runs instead of the next schedule-interval aligned execution date.
 
This _might_ break backwards compatibility for some users but it can be argued that the current functionality is a bug. If it's really desired we can create new aliases that behave logically although I am against this.
 
prev_ds should probably also be made consistent with this logic.



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