update migration to stop excessive consumption of computation #2521
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WalkthroughThe changes involve a database migration script for the Changes
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (1)
indexer/packages/postgres/src/db/migrations/migration_files/20240910101410_change_fills_affiliaterevshare_type.ts (1)
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1-17: Summary of review and next stepsThe migration file makes a positive change by converting the
affiliateRevSharecolumn from string to decimal, which aligns with the PR objective of reducing computational consumption. However, there are several important points to address:
- Implement data preservation and conversion logic in both
upanddownmigrations to prevent data loss.- Consider adding an index on the
affiliateRevSharecolumn if it's frequently used in queries.- If possible, specify the precision for the decimal column instead of using variable precision.
- Verify the impact of these changes by analyzing existing data and query patterns.
Please update the migration file addressing these points. Once the changes are made, we can proceed with further testing to ensure the migration performs as expected without any data loss or performance issues.
As a general guideline for future migrations, consider creating a checklist or template that includes steps for data preservation, performance considerations, and rollback strategies. This can help ensure that all migrations are thoroughly planned and executed with minimal risk.
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- indexer/packages/postgres/src/db/migrations/migration_files/20240910101410_change_fills_affiliaterevshare_type.ts (1 hunks)
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🔇 Additional comments (2)
indexer/packages/postgres/src/db/migrations/migration_files/20240910101410_change_fills_affiliaterevshare_type.ts (2)
15-16:⚠️ Potential issueImprove data handling in down migration
The
downfunction correctly reverts the column type change, but it has similar issues to theupfunction:
- Dropping and re-adding the column will lead to data loss.
- There's no data conversion logic to handle existing decimal values.
Consider modifying the down migration to preserve and convert existing data:
export async function down(knex: Knex): Promise<void> { return knex.schema.alterTable('fills', (table) => { // Add a new column table.string('affiliateRevShare_old').nullable(); // Update the new column with converted data await knex.raw(` UPDATE fills SET affiliateRevShare_old = CAST(affiliateRevShare AS VARCHAR) `); // Drop the old column table.dropColumn('affiliateRevShare'); // Rename the new column table.renameColumn('affiliateRevShare_old', 'affiliateRevShare'); // Set the column to not nullable with a default value table.string('affiliateRevShare').notNullable().defaultTo('0').alter(); }); }This approach ensures data preservation and proper type conversion during rollback.
To verify the impact of this change, we can check for any existing data in the
fillstable:#!/bin/bash # Check for existing data in the fills table psql -c "SELECT COUNT(*) FROM fills WHERE affiliateRevShare IS NOT NULL AND affiliateRevShare != 0;"If this query returns a count greater than 0, we should definitely implement the data preservation strategy in the down migration as well.
Line range hint
1-17: Alignment with PR objectives and further optimization suggestionsThe change from string to decimal for
affiliateRevSharealigns well with the PR objective of reducing "excessive consumption of computation". This data type change should improve query performance and reduce storage requirements.However, to fully realize these benefits and ensure data integrity:
- Implement the data preservation and conversion logic as suggested in the previous comments.
- Consider adding an index on the
affiliateRevSharecolumn if it's frequently used in queries:export async function up(knex: Knex): Promise<void> { // ... (previous migration steps) // Add an index on affiliateRevShare await knex.schema.alterTable('fills', (table) => { table.index('affiliateRevShare'); }); } export async function down(knex: Knex): Promise<void> { // Drop the index before altering the column await knex.schema.alterTable('fills', (table) => { table.dropIndex('affiliateRevShare'); }); // ... (previous down migration steps) }
- If
affiliateRevSharevalues have a known precision, consider specifying it instead of using variable precision:table.decimal('affiliateRevShare', 15, 5).notNullable().defaultTo(0);This can further optimize storage and computation.
To assess the potential performance impact, we can check the current usage of the
affiliateRevSharecolumn:#!/bin/bash # Check for queries using affiliateRevShare psql -c "SELECT query, calls, total_time, mean_time FROM pg_stat_statements WHERE query ILIKE '%affiliateRevShare%' ORDER BY total_time DESC LIMIT 5;"This will help determine if adding an index would be beneficial.
| table.dropColumn('affiliateRevShare'); | ||
| table.decimal('affiliateRevShare', null).notNullable().defaultTo(0); |
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💡 Codebase verification
Implement data conversion to preserve existing affiliateRevShare values
The migration alters the affiliateRevShare column from string to decimal without handling existing data. Given the extensive usage of affiliateRevShare across the codebase, this change risks data loss. It is essential to incorporate data conversion logic to ensure existing values are accurately transformed and preserved during the migration.
export async function up(knex: Knex): Promise<void> {
return knex.schema.alterTable('fills', async (table) => {
// Add a new column with the desired type
table.decimal('affiliateRevShare_new', null).nullable();
// Convert and migrate existing data
await knex.raw(`
UPDATE fills
SET affiliateRevShare_new = CAST(affiliateRevShare AS DECIMAL)
`);
// Drop the old column
table.dropColumn('affiliateRevShare');
// Rename the new column to maintain consistency
table.renameColumn('affiliateRevShare_new', 'affiliateRevShare');
// Set the new column to not nullable with a default value
table.decimal('affiliateRevShare', null).notNullable().defaultTo(0).alter();
});
}🔗 Analysis chain
Consider data preservation and conversion in the migration
The change from string to decimal for affiliateRevShare is a good step towards improving computational efficiency. However, there are some concerns:
- Dropping and re-adding the column will lead to data loss for existing records.
- There's no data conversion logic to handle existing string values.
Consider modifying the migration to preserve and convert existing data:
export async function up(knex: Knex): Promise<void> {
return knex.schema.alterTable('fills', (table) => {
// Add a new column
table.decimal('affiliateRevShare_new', null).nullable();
// Update the new column with converted data
await knex.raw(`
UPDATE fills
SET affiliateRevShare_new = CAST(affiliateRevShare AS DECIMAL)
`);
// Drop the old column
table.dropColumn('affiliateRevShare');
// Rename the new column
table.renameColumn('affiliateRevShare_new', 'affiliateRevShare');
// Set the column to not nullable with a default value
table.decimal('affiliateRevShare', null).notNullable().defaultTo(0).alter();
});
}This approach ensures data preservation and proper type conversion.
To verify the impact of this change, we can check for any existing data in the fills table:
If this query returns a count greater than 0, we should definitely implement the data preservation strategy.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check for existing data in the fills table
psql -c "SELECT COUNT(*) FROM fills WHERE affiliateRevShare IS NOT NULL AND affiliateRevShare != '0';"
Length of output: 266
Script:
#!/bin/bash
# Search the entire codebase for usages of 'affiliateRevShare'
rg 'affiliateRevShare' --context 2
Length of output: 67579
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(cherry picked from commit b829b28)
Changelist
[Describe or list the changes made in this PR]
Test Plan
[Describe how this PR was tested (if applicable)]
Author/Reviewer Checklist
state-breakinglabel.indexer-postgres-breakinglabel.PrepareProposalorProcessProposal, manually add the labelproposal-breaking.feature:[feature-name].backport/[branch-name].refactor,chore,bug.Summary by CodeRabbit
New Features
affiliateRevSharecolumn in thefillstable to improve data accuracy by changing its type to decimal.Bug Fixes
affiliateRevSharecolumn is not nullable and has a default value of 0 for better data integrity.