Ensure consistent current_time across microbatch models in an invocation
#10830
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## main #10830 +/- ##
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- Coverage 89.20% 89.15% -0.05%
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Files 183 183
Lines 23402 23420 +18
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+ Hits 20875 20880 +5
- Misses 2527 2540 +13
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| @@ -18,6 +18,7 @@ def __init__( | |||
| is_incremental: bool, | |||
| event_time_start: Optional[datetime], | |||
| event_time_end: Optional[datetime], | |||
| batch_current_time: Optional[datetime] = None, | |||
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Can this be batch_invoked_at for consistency?
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I'm down to rename the variable. However, I think batch_invoked_at would give the wrong impression. This datetime is not when the batch was actually invoked. The datetime will be before the batch is actually invoked, by how much is dependent on how long the project takes to run and when the microbatch model is being worked on within that.
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How about batch_default_end_time?
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or default_end_time? 🤔 Saying batch feels kinda redundant
| @@ -18,6 +18,7 @@ def __init__( | |||
| is_incremental: bool, | |||
| event_time_start: Optional[datetime], | |||
| event_time_end: Optional[datetime], | |||
| batch_current_time: Optional[datetime] = None, | |||
| ): | |||
| if model.config.incremental_strategy != "microbatch": | |||
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Are we in the right branch for batch_current_time?
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I'm not sure I understand, can you elaborate on "in the right branch"?
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If this is in reference to batch vs microbatch. For better or worse, we've been kinda using them interchangeably 🙈
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A cursory glance led me to believe that we have two branches – microbatch and default.
If we're not in the microbatch branch, I assume we're in the default branch.
If this is the case, does batch_current_time make sense here?
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TL;DR
batch_current_time (now renamed to default_end_time) is only relevant to microbatch models
This file (microbatch.py) and the class itself (MicrobatchBuilder) should only ever be invoked when running on a microbatch model. That logic for separating whether we in a "default" (a.k.a. non-microbatch) model or a microbatch model lives in run.py in the execute() method. Thus, if we're in this code (microbatch.py), we're inherently in a microbatch context / logic branch. Hope that all makes sense. I sometimes forget that the rest of the team doesn't automatically have the context of how microbatch models work 😅 Let me know if you want a walk through the microbatch code at large if that'd be useful 🙂
QMalcolm
deleted the
qmalcolm--10819-consistent-current-time-for-microbatch
branch
Resolves #10819
Problem
Different microbatch models in the same
dbt runcould end up with differentcurrent_time. This could cause a situation where two microbatch models operating on the same inputs could end up with more/less data if one microbatch model was executed significantly later than the other.Solution
Make it so each microbatch model in an invocation is using the same
current_timeChecklist