Multi-Block-Migrations: Support small steps #4989
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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
pgherveou
reviewed
Jul 24, 2024
substrate/frame/examples/multi-block-migrations/src/migrations/v1/mod.rs
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substrate/frame/examples/multi-block-migrations/src/migrations/v1/mod.rs
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| Self::deposit_event(Event::MigrationAdvanced { | ||
| index: cursor.index, | ||
| took_blocks, | ||
| took_steps, | ||
| }); |
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should we keep that event? I am just thinking that it's going to be a lot of deposited event (1 for each iteration)
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Yes i also wondered it. Maybe only at the end of the loop... will try how it looks.
Emitting one event per iteration could be problematic when a migration does thousands of steps per block, and hardly that useful. We therefore only emit one MigrationAdvanced event at the end of the block. Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
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Multi-Block-Migrations currently require the migrations to do as much compute per step as possible.
This was done to allow for more efficient batch code to run, but from a user perspective it can be much nicer to be able to do just a tiny step (eg migrating a map key).
This MR changes MBM to be able to do mini steps, but stays backwards compatible to MBMs that do big steps.
Changes:
Integration
You can now optionally implement this function for your MBMs:
impl SteppedMigration for MyMigration { ... + fn max_steps() -> Option<u32> { + None + } }Not implementing it is defaulting to no limit - same as before.