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(core) Perform migrations of Grist schema using only metadata tables when possible.

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Summary:
Loading all user data to run a migration is risky (creates more than usual
memory pressure), and almost never needed (only one migration requires it).

This diff attempts to run migrations using only metadata (_grist_* tables),
but retries if the sandbox tells it that all data is needed.

The intent is for new migrations to avoid needing all data.

Test Plan: Added a somewhat contrived unittest.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2659
This commit is contained in:
Dmitry S
2020-11-11 16:29:11 -05:00
parent 5a9fe0ea27
commit 5b2de988b5
4 changed files with 70 additions and 31 deletions
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4
sandbox/grist/main.py
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@@ -97,9 +97,9 @@ def main():
return eng.load_table(table_data_from_db(table_name, table_data))
@export
def create_migrations(all_tables):
def create_migrations(all_tables, metadata_only=False):
doc_actions = migrations.create_migrations(
{t: table_data_from_db(t, data) for t, data in all_tables.iteritems()})
{t: table_data_from_db(t, data) for t, data in all_tables.iteritems()}, metadata_only)
return map(actions.get_action_repr, doc_actions)
@export