cc-backend/tools/archive-migration

Archive Migration Tool

Overview

The archive-migration tool migrates job archives from old schema versions to the current schema version. It handles schema changes such as the exclusive → shared field transformation and adds/removes fields as needed.

Features

• Parallel Processing: Uses worker pool for fast migration
• Dry-Run Mode: Preview changes without modifying files
• Safe Transformations: Applies well-defined schema transformations
• Progress Reporting: Shows real-time migration progress
• Error Handling: Continues on individual failures, reports at end

Schema Transformations

Exclusive → Shared

Converts the old exclusive integer field to the new shared string field:

• 0 → "multi_user"
• 1 → "none"
• 2 → "single_user"

Missing Fields

Adds fields required by current schema:

• submitTime: Defaults to startTime if missing
• energy: Defaults to 0.0
• requestedMemory: Defaults to 0
• shared: Defaults to "none" if still missing after transformation

Deprecated Fields

Removes fields no longer in schema:

• mem_used_max, flops_any_avg, mem_bw_avg
• load_avg, net_bw_avg, net_data_vol_total
• file_bw_avg, file_data_vol_total

Usage

Build

cd /Users/jan/prg/cc-backend/tools/archive-migration
go build

Dry Run (Preview Changes)

./archive-migration --archive /path/to/archive --dry-run

Migrate Archive

# IMPORTANT: Backup your archive first!
cp -r /path/to/archive /path/to/archive-backup

# Run migration
./archive-migration --archive /path/to/archive

Command-Line Options

• --archive <path>: Path to job archive (required)
• --dry-run: Preview changes without modifying files
• --workers <n>: Number of parallel workers (default: 4)
• --loglevel <level>: Logging level: debug, info, warn, err, fatal, crit (default: info)
• --logdate: Add timestamps to log messages

Examples

# Preview what would change
./archive-migration --archive ./var/job-archive --dry-run

# Migrate with verbose logging
./archive-migration --archive ./var/job-archive --loglevel debug

# Migrate with 8 workers for faster processing
./archive-migration --archive ./var/job-archive --workers 8

Safety

Caution

Always backup your archive before running migration!

The tool modifies meta.json files in place. While transformations are designed to be safe, unexpected issues could occur. Follow these safety practices:

1. Always run with --dry-run first to preview changes
2. Backup your archive before migration
3. Test on a copy of your archive first
4. Verify results after migration

Verification

After migration, verify the archive:

# Use archive-manager to check the archive
cd ../archive-manager
./archive-manager -s /path/to/migrated-archive

# Or validate specific jobs
./archive-manager -s /path/to/migrated-archive --validate

Troubleshooting

Migration Failures

If individual jobs fail to migrate:

• Check the error messages for specific files
• Examine the failing meta.json files manually
• Fix invalid JSON or unexpected field types
• Re-run migration (already-migrated jobs will be processed again)

Performance

For large archives:

• Increase --workers for more parallelism
• Use --loglevel warn to reduce log output
• Monitor disk I/O if migration is slow

Technical Details

The migration process:

1. Walks archive directory recursively
2. Finds all meta.json files
3. Distributes jobs to worker pool
4. For each job:
   • Reads JSON file
   • Applies transformations in order
   • Writes back migrated data (if not dry-run)
5. Reports statistics and errors

Transformations are idempotent - running migration multiple times is safe (though not recommended for performance).