[crag] Add fields not brought about in default config, fix bug with execute_in_process and default config, catch bad config earlier on .
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Authored by • cdecarolis on Jul 23 2021, 6:01 PM.

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• sandyryza
alangenfeld

Summary

Currently, we aren't carrying over fields from the original config if they aren't specified in the default config for a job. This leads to either weird errors, or wrong config in some cases. This attempts to fix the issue.

That fix also required me to finagle around the executor config that is now always carried over.

Test Plan

unit tests

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Repository

R1 dagster

Branch

graph_config_fix

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Event Timeline

• cdecarolis created this revision.Jul 23 2021, 6:01 PM

• cdecarolis mentioned this in D8550: [op] permit op config entry.Jul 23 2021, 6:02 PM

Harbormaster completed remote builds in B34152: Diff 42216.Jul 23 2021, 6:26 PM

• cdecarolis requested review of this revision.Jul 23 2021, 6:26 PM

alangenfeld added inline comments.Jul 23 2021, 6:36 PM

python_modules/dagster/dagster/core/definitions/graph.py
768–774	should we just do a real proper validation pass over the config instead of only covering this small subset of error conditions?
python_modules/dagster/dagster/core/definitions/pipeline.py
569–597	this feels pretty scary to me - we should just make a special variant of the in process executor def that takes Permissive config and ignores it all
python_modules/dagster/dagster_tests/core_tests/graph_tests/test_graph.py
345–353	to my above point - what about "ops/solids: not_my_op" that wouldn't get caught with current checks right? I think it make sense to use the core config validation machinery the only open question is if we want to support "partial" default config - which i think is no

alangenfeld requested changes to this revision.Jul 23 2021, 6:36 PM

This revision now requires changes to proceed.Jul 23 2021, 6:36 PM

• cdecarolis added inline comments.Jul 26 2021, 4:58 PM

python_modules/dagster/dagster/core/definitions/pipeline.py
569–597	That's a really good point - in execute_in_process I don't think we'll ever end up using the execution config anyway.

• cdecarolis added inline comments.Jul 26 2021, 7:35 PM

python_modules/dagster/dagster/core/definitions/pipeline.py
569–597	cc @alangenfeld; what do we do about the top level config blobs that will likely be a part of any job, like {execution: {multiprocess: {}}} Even if we had an executor that takes permissive, the top level entry is different, and would still break

alangenfeld added inline comments.Jul 26 2021, 8:38 PM

python_modules/dagster/dagster/core/definitions/pipeline.py
569–597	ah good point - hmmmm This ConfigMapping stacking spooks me a bit which is why i was hopeful to find an alternative path. It might be the way we need to go but lets think through the other options: target "execute_plan" directly which would bypass executor - loses pipeline start/fail/success events have the "special" in process executor change make the whole execution section permissive at RunConfigSchema generation time - I think this is promising if we stick with this config mapping approach ild want to see some more tests & comments

have the "special" in process executor change make the whole execution section permissive at RunConfigSchema generation time - I think this is promising

I know this isn't a huge regression, but it still feels like a regression to me. I feel like it's a pretty core change for what is fundementally a workaround.

target "execute_plan" directly which would bypass executor - loses pipeline start/fail/success events

I think this approach actually resonates with me more. I think it in some ways neatly resolves the conceptual friction of replacing the executor with another one. It feels nice to me to say that we're bypassing the executor altogether with execute_in_process rather than foisting a new one in. Maybe I'm underestimating how difficult it will be to use execute_plan, but that approach seems cleaner and actually brings execute_in_process closer to what we want.

cc @alangenfeld ^ bc I forgot to tag you

@alangenfeld upon further examination, I don't think the execute_plan solution can work. Even if we keep around the original executors, we still need to create a new pipeline/mode in order to switch out the io manager. Then, we'll get a different set of complaints regarding the fact that we're using a non-persistent IO manager with an out of proc executor. I think we're forced to either do the config replacement or the permissive thing.

• cdecarolis abandoned this revision.Aug 3 2021, 12:08 AM