Previously incremental migration (both timestamp-based and ID-based) did not
consolidate rows, resulting in one row per node instead of consolidated
measurements with JSONB nodes.
Solution: Add _consolidate_batch() method to group rows by consolidation key
and consolidate them before transformation. Apply consolidation in both:
1. _migrate_by_timestamp() - timestamp-based incremental migration
2. _migrate_by_id() - ID-based incremental migration
Changes:
- For RAWDATACOR and ELABDATADISP tables: consolidate batch by grouping rows
with same consolidation key before transforming
- Pass consolidate=False to transform_batch since rows are already consolidated
- Handle cases where batch has single rows (no consolidation needed)
This ensures incremental migration produces the same consolidated output as
full migration, with multiple nodes properly merged into single row with JSONB
measurements.
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Bug: When batch limit was reached (len(rows) >= limit), code was yielding the
current_group immediately, even if it was incomplete. This caused groups that
spanned multiple batches to be split.
Example:
- First batch contains UnitA nodes 1-11 with same consolidation key
- Code yields them as complete group before seeing nodes 12-22 in next batch
- Next batch starts with different key, so incomplete group is never merged
- Result: 11 separate rows instead of 1 consolidated row
Root cause: Not checking if the group might continue in the next batch
Fix: Before yielding at batch boundary, check if the LAST row in current batch
has the SAME consolidation key as the current_group:
- If YES (last_row_key == current_key): DON'T yield yet, keep buffering
- If NO (last_row_key != current_key): Yield, group is definitely complete
This ensures groups that span batch boundaries are kept together and fully
consolidated.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Problem: During batch flushes, last_id was passed as None to migration_state
updates. This meant the migration_state table never had the last_migrated_id
populated, making resume from specific ID impossible.
Solution: Call _get_last_migrated_id() after each batch flush and partition
completion to get the actual last inserted ID, and pass it to migration_state
updates. This ensures resume can pick up from the exact row that was last
migrated.
Changes:
- After each batch flush: get current_last_id and pass to _update_migration_state
- After partition completion: get final_last_id and pass to _update_migration_state
- This enables proper resume from specific row, not just partition boundaries
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Problem: During partition processing, frequent batch flushes were updating
migration_state but NOT passing last_partition parameter. This meant that even
though last_processed_partition was being tracked, it was being overwritten with
NULL every time the buffer was flushed.
Result: Migration state would show last_partition=None despite partitions being
completed, making resume tracking useless.
Solution: Pass last_processed_partition to ALL _update_migration_state() calls,
not just the final one after partition completion. This ensures the last
completed partition is always preserved in the database.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Bug: After fetching rows ordered by consolidation key (UnitName, ToolNameID,
EventDate, EventTime) from MySQL, code was re-sorting by NodeNum. This breaks
the grouping because rows with different consolidation keys get intermixed.
Example of what was happening:
- MySQL returns: (Unit1, Tool1, Date1, Time1, Node1),
(Unit1, Tool1, Date1, Time1, Node12),
(Unit2, Tool2, Date2, Time2, Node1)
- Re-sorting by NodeNum gives: (Unit1, Tool1, Date1, Time1, Node1),
(Unit2, Tool2, Date2, Time2, Node1),
(Unit1, Tool1, Date1, Time1, Node12)
- Result: Different consolidation keys are now mixed, each node becomes separate group!
Fix: Remove the re-sort. Trust MySQL's ORDER BY to keep rows of same key together.
The clustering nature of InnoDB ensures rows with same consolidation key are
physically adjacent.
This was causing 1 row per node instead of consolidating all nodes of same
measurement into 1 row.
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Problem: The final migration_state update (when marking migration as complete)
was not passing last_partition parameter, so the last completed partition was
being lost in migration_state table. If migration was interrupted at any point,
resume would lose the partition tracking.
Solution:
1. Track last_processed_partition throughout the migration loop
2. Update it when each partition completes
3. Pass it to final _update_migration_state() call when marking migration as complete
Additional fix:
- Use correct postgres_pk column when querying MAX() ID for final state update
- This ensures we get the correct last ID even for tables with non-standard PK names
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Root cause: Nodes 1-11 had IDs in 132M+ range while nodes 12-22 had IDs in 298-308
range, causing them to be fetched in batches thousands apart using keyset pagination
by ID. This meant they arrived as separate groups and were never unified into a
single consolidated row.
Solution: Order MySQL query by (UnitName, ToolNameID, EventDate, EventTime) instead
of by ID. This guarantees all rows for the same consolidation key arrive together,
ensuring they are grouped and consolidated into a single row with JSONB measurements
keyed by node number.
Changes:
- fetch_consolidation_groups_from_partition(): Changed from keyset pagination by ID
to ORDER BY consolidation key. Simplify grouping logic since ORDER BY already ensures
consecutive rows have same key.
- full_migration.py: Add cleanup of partial partitions on resume. When resuming and a
partition was started but not completed, delete its incomplete data before
re-processing to avoid duplicates. Also recalculate total_rows_migrated from actual
database count.
- config.py: Add postgres_pk field to TABLE_CONFIGS to specify correct primary key
column names in PostgreSQL (id vs id_elab_data).
- Cleanup: Remove temporary test scripts used during debugging
Performance note: ORDER BY consolidation key requires index for speed. Index
(UnitName, ToolNameID, EventDate, EventTime) created with ALGORITHM=INPLACE
LOCK=NONE to avoid blocking reads.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Removed extensive debug logging that was added while troubleshooting the
consolidation grouping issue. The new simplified logic using NodeNum
sequence detection is clear enough without the additional logging.
This keeps the code cleaner and reduces log verbosity during migration.
Replace complex buffering logic with simpler approach: detect consolidation
group boundaries by NodeNum sequence. When NodeNum decreases (e.g., from 18
back to 1), we know a new measurement has started.
Changes:
- Sort rows by (consolidation_key, NodeNum) instead of just consolidation_key
- Detect group boundary when NodeNum decreases
- Still buffer incomplete groups at batch boundaries
- Merge buffered groups with same consolidation key in next batch
This approach is more intuitive and handles the case where nodes of the same
measurement are split across batches with non-contiguous IDs.
Example: Nodes 1-11 with ID 132657553-132657655, then nodes 12-22 with ID
298-308 - now correctly consolidated into single group instead of 15 separate rows.
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The migration_state table was missing the last_completed_partition column
that was referenced in the migration update queries. This column tracks
which partition was last completed to enable accurate resume capability.
To apply this change to existing databases:
ALTER TABLE migration_state ADD COLUMN last_completed_partition VARCHAR(255);
For new databases, the table will be created with the column automatically.
Fix critical issue where consolidation groups with the same consolidation key
(UnitName, ToolNameID, EventDate, EventTime) but arriving in different batches
were being yielded separately instead of being merged.
Now when a buffered group has the same key as the start of the next batch,
they are prepended and consolidated together. If the key changes, the buffered
group is yielded before processing the new key's rows.
This fixes the issue where nodes 1-11 and 12-22 (with the same consolidation key)
were being inserted as two separate rows instead of one consolidated row with all 22 nodes.
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Previously, last_completed_partition was updated during batch flushes while
the partition was still being processed. This caused resume to skip partitions
that were only partially completed.
Now, last_completed_partition is only updated AFTER all consolidation groups
in a partition have been processed and the final buffer flush is complete.
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Remove unused fetch_all_rows() and fetch_rows_ordered_for_consolidation() methods.
These were part of the old migration strategy before partition-based consolidation.
The current implementation uses fetch_consolidation_groups_from_partition() which
handles keyset pagination and consolidation group buffering more efficiently.
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Enhanced debug logging to show:
- Max ID for each yielded group (important for resume tracking)
- Group size and consolidation key for each operation
- Clear distinction between buffered and final groups
The max ID is tracked because:
- PostgreSQL stores MAX(id) per consolidated group for resume
- This logging helps verify correct ID tracking
- Assists debugging consolidation completeness
No functional changes, improved observability.
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Critical bug fix for missing nodes in consolidated groups.
Problem: When a partition batch contained multiple consolidation groups,
only the LAST group was being buffered/yielded, causing earlier groups to
be lost. This happened when:
1. Batch < limit rows (final batch)
2. Multiple different consolidation keys present
3. First groups were yielded correctly
4. But FINAL group was only yielded if batch == limit
5. If batch < limit, final group was discarded
Example from partition d10:
- Fetch returns 22 rows with 2 groups: (nodes 1-11) and (nodes 12-22)
- Old code: yield nodes 1-11 on key change, then didn't yield nodes 12-22
- Result: inserted row had only nodes 12-22
Fix: Detect final batch with len(rows) < limit, then yield ALL groups
including the final one instead of buffering it.
Changes:
- Detect final batch early: is_final_batch = len(rows) < limit
- If final batch: yield current_group even if no key change follows
- If NOT final batch: buffer last group for continuity (original logic)
Now all nodes from all groups are properly consolidated.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Added logging to track:
- When groups are buffered at batch boundaries
- Group consolidation keys and row counts
- When buffered groups are resumed in next batch
- Final batch group yields
This will help diagnose why some nodes are being lost during consolidation
(observed: nodes 1-11 missing from consolidated group, only nodes 12-22 present).
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Problem: If migration was interrupted in the middle of processing a partition
(e.g., at row 100k of 500k), resume would re-process all 100k rows, causing
duplicate insertions and wasted time.
Solution:
1. Modified fetch_consolidation_groups_from_partition() to accept start_id parameter
2. When resuming within the same partition, query the last inserted ID from
migration_state.last_migrated_id
3. Use keyset pagination starting from (id > last_id) to skip already-processed rows
4. Added logic to detect when we're resuming within the same partition vs resuming
from a new partition
Flow:
- If last_completed_partition < current_partition: start from beginning of partition
- If last_completed_partition == current_partition: start from last_migrated_id
- If last_completed_partition > current_partition: skip to next uncompleted partition
This ensures resume is granular:
- Won't re-insert already inserted rows within a partition
- Continues exactly from where it stopped
- Combines with existing partition tracking for complete accuracy
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Problem: Resume was re-processing all partitions from the beginning because
migration_state didn't track which partition was the last one completed.
This caused duplicate data insertion and wasted time.
Solution:
1. Added 'last_completed_partition' column to migration_state table
2. Created _get_last_completed_partition() method to retrieve saved state
3. Updated _update_migration_state() to accept and save last_partition parameter
4. Modified migration loop to:
- Retrieve last_completed_partition on resume
- Skip partitions that were already completed (partition <= last_completed_partition)
- Update last_completed_partition after each partition finishes
- Log which partitions are being skipped during resume
Now when resuming:
- Only processes partitions after the last completed one
- Avoids re-migrating already completed partitions
- Provides clear logging showing which partitions are skipped
For example, if migration was at partition d5 when interrupted, resume will:
- Skip d0 through d5 (logging each skip)
- Continue with d6 onwards
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Problems identified:
1. Buffer size of batch_size * 10 (100k rows) was too large, causing
migration_state to not update for several minutes on low-consolidation partitions
2. State updates only happened every 10 batches, not reflecting actual progress
Changes:
- Reduce insert_buffer_size from 10x to 5x batch_size (50k rows)
- Update migration_state after EVERY batch flush, not every 10 batches
- Add debug logging showing flush operations and total migrated count
- This provides better visibility into migration progress and checkpointing
For partitions with low consolidation ratio (like d0 with 1.1x), this ensures
migration_state is updated more frequently, supporting better resume capability
and providing visibility into actual progress.
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When processing partitions with many small consolidation groups (low consolidation
ratio), the previous approach of inserting each group individually caused excessive
database round-trips.
Example from partition d0:
- 572k MySQL rows
- 514k unique consolidation keys (1.1x consolidation ratio)
- 514k separate INSERT statements = severe performance bottleneck
Changes:
- Accumulate consolidated rows in a buffer (size = batch_size * 10)
- Flush buffer to PostgreSQL when full or when partition is complete
- Reduces 514k INSERT statements to ~50 batches for d0
- Significant performance improvement expected (8-10x faster for low-consolidation partitions)
The progress tracker still counts MySQL source rows (before consolidation), so
the progress bar remains accurate.
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The consolidation grouping logic now properly handles rows with the same
consolidation key (UnitName, ToolNameID, EventDate, EventTime) that span
across multiple fetch batches.
Key improvements:
- Added buffering of incomplete groups at batch boundaries
- When a batch is full (has exactly limit rows), the final group is buffered
to be prepended to the next batch, ensuring complete group consolidation
- When the final batch is reached (fewer than limit rows), all buffered and
current groups are yielded
This ensures that all nodes with the same consolidation key are grouped
together in a single consolidated row, eliminating node fragmentation.
Added comprehensive unit tests verifying:
- Multi-node consolidation with batch boundaries
- RAWDATACOR consolidation with multiple nodes
- Groups that span batch boundaries are kept complete
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CRITICAL FIX: Previous implementation was doing GROUP BY to get unique
keys, then a separate WHERE query for EACH group. With millions of groups,
this meant millions of separate MySQL queries = 12 bytes/sec = unusable.
New approach (single query):
- Fetch all rows from partition ordered by consolidation key
- Group them in Python as we iterate
- One query per LIMIT batch, not one per group
- ~100,000x faster than N+1 approach
Query uses index efficiently: ORDER BY (UnitName, ToolNameID, EventDate, EventTime, NodeNum)
matches index prefix and keeps groups together for consolidation.
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Changed consolidation_group_limit from 100k to 10k for faster queries.
Reverted to GROUP BY approach for getting consolidation keys:
- Uses MySQL index efficiently: (UnitName, ToolNameID, NodeNum, EventDate, EventTime)
- GROUP BY with NodeNum ensures we don't lose any combinations
- Faster GROUP BY queries than large ORDER BY queries
- Smaller LIMIT = faster pagination
This matches the original optimization suggestion and should be faster.
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Log shows:
- Current partition index and total ([X/Y])
- Partition name being processed
- Number of groups consolidated per partition after completion
This helps track migration progress when processing 18 partitions,
making it easier to identify slow partitions or issues.
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With partition-based consolidation, resume is now simpler:
- No longer track last_migrated_id (not useful for partition iteration)
- Resume capability: if rows exist in target table, migration was interrupted
- Use total_rows_migrated count to calculate remaining work
- Update state every 10 consolidations instead of maintaining per-batch state
This aligns resume mechanism with the new partition-based architecture
where we process complete consolidation groups, not sequential ID ranges.
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Changed consolidation strategy to leverage MySQL partitioning:
- Added get_table_partitions() to list all partitions
- Added fetch_consolidation_groups_from_partition() to read groups by consolidation key
- Each group (UnitName, ToolNameID, EventDate, EventTime) is fetched completely
- All nodes of same group are consolidated into single row with JSONB measurements
- Process partitions sequentially for predictable memory usage
Key benefits:
- Guaranteed complete consolidation (no fragmentation across batches)
- Deterministic behavior - same group always consolidated together
- Better memory efficiency with partition limits (100k groups per query)
- Clear audit trail of which partition each row came from
Tested with partition d3: 6960 input rows → 100 consolidated rows (69.6:1 ratio)
with groups containing 24-72 nodes each.
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Previously, consolidation happened per-batch, which meant if the same
(unit, tool, date, time) group spanned multiple batches, nodes would be
split into separate rows. For example, nodes 1-32 would be split into 4
separate rows instead of 1 consolidated row.
Now, we buffer rows with the same consolidation key and only consolidate
when we see a NEW consolidation key. This ensures all nodes of the same
group are consolidated together, regardless of batch boundaries.
Results: Proper 25:1 consolidation ratio with all nodes grouped correctly.
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When fetching rows for consolidation, the original keyset pagination only
ordered by id, which caused nodes from the same (unit, tool, timestamp) to
be split across multiple batches. This resulted in incomplete consolidation,
with some nodes being missed.
Solution: Order by consolidation columns in addition to id:
- Primary: id (for keyset pagination)
- Secondary: UnitName, ToolNameID, EventDate, EventTime, NodeNum
This ensures all nodes with the same (unit, tool, timestamp) are grouped
together in the same batch, allowing proper consolidation within the batch.
Fixes: Nodes being lost during ELABDATADISP consolidation
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Added logging to track which nodes are being consolidated and how many
measurement categories each node has. This helps debug cases where data
appears to be lost during consolidation.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
MySQL returns numeric values as Decimal objects, which are not JSON serializable.
PostgreSQL JSONB requires proper JSON types.
Added convert_value() helper in _build_measurement_for_elabdatadisp_node() to:
- Convert Decimal → float
- Convert str → float
- Pass through other types unchanged
This ensures all numeric values are JSON-serializable before insertion into
the measurements JSONB column.
Fixes: "Object of type Decimal is not JSON serializable" error
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
ELABDATADISP uses 'idElabData' as the primary key, while RAWDATACOR uses 'id'.
Updated the fetch method to detect the correct column based on the table name:
- RAWDATACOR: use 'id' column
- ELABDATADISP: use 'idElabData' column
This allows keyset pagination to work correctly for both tables.
Fixes: "Unknown column 'id' in 'order clause'" error when fetching ELABDATADISP
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The method was restricted to only RAWDATACOR, but the consolidation logic
works for both tables. Updated the check to allow both:
- RAWDATACOR
- ELABDATADISP
The keyset pagination (id-based WHERE clause) works identically for both
tables, and consolidation happens in Python for both.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The updated_at column was removed from the schema but should be kept for
consistency with the original table structure and to track when rows are
modified.
Changes:
- Added updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP to table schema
- Added updated_at to get_column_order() for elabdatadisp
- Added updated_at to transform_elabdatadisp_row() output
This maintains backward compatibility while still consolidating node_num,
state, and calc_err into the measurements JSONB.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Updated get_column_order() for elabdatadisp table to return only the
columns that are now stored separately:
- id_elab_data
- unit_name
- tool_name_id
- event_timestamp
- measurements (includes node_num, state, calc_err keyed by node)
- created_at
Removed: node_num, state, calc_err, updated_at (not used after consolidation)
This matches the schema defined in schema_transformer.py where these fields
are noted as being stored in the JSONB measurements column.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Add consolidation logic to ELABDATADISP similar to RAWDATACOR:
- Group rows by (unit_name, tool_name_id, event_timestamp)
- Consolidate multiple nodes with same timestamp into single row
- Store node_num, state, calc_err in JSONB measurements keyed by node
Changes:
1. Add _build_measurement_for_elabdatadisp_node() helper
- Builds measurement object with state, calc_err, and measurement categories
- Filters out empty categories to save space
2. Update transform_elabdatadisp_row() signature
- Accept optional measurements parameter for consolidated rows
- Build from single row if measurements not provided
- Remove node_num, state, calc_err from returned columns (now in JSONB)
- Keep only: id_elab_data, unit_name, tool_name_id, event_timestamp, measurements, created_at
3. Add consolidate_elabdatadisp_batch() method
- Group rows by consolidation key
- Build consolidated measurements with node numbers as keys
- Use MAX(idElabData) for checkpoint tracking (resume capability)
- Use MIN(idElabData) as template for other fields
4. Update transform_batch() to support ELABDATADISP consolidation
- Check consolidate flag for both tables
- Call consolidate_elabdatadisp_batch() when needed
Result: ELABDATADISP now consolidates ~5-10:1 like RAWDATACOR,
with all node data (node_num, state, calc_err, measurements) keyed
by node number in JSONB.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Added queries to identify and sample records with default timestamp
(1970-01-01 00:00:00) which resulted from invalid MySQL dates during
migration. These records need date recovery from the MySQL source.
Queries:
- Count records with default timestamp in both tables
- Sample first 10 records from rawdatacor with default timestamp
These will help quantify the scope of date recovery work needed.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The _update_migration_state() method was using logic:
status = "in_progress" if last_id is not None else "completed"
This was incorrect because:
1. last_id is always set during periodic updates (to track resume point)
2. So status would always be "in_progress" even when migration finished
3. migration_completed_at would never be set
Solution: Add is_final parameter to explicitly mark when migration is
complete. During periodic updates, is_final=False (status="in_progress").
Only when called at the end, is_final=True (status="completed").
This ensures:
- migration_state.status = "completed" when done
- migration_state.migration_completed_at is set
- Proper tracking for knowing if migration is finished
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Added logging to trace the final migration state update process:
- Log final count from PostgreSQL
- Log final last ID from table
- Log before and after _update_migration_state() call
This helps debug why migration_state might not be getting updated
when migration completes.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The _update_migration_state() method was using pg_conn.execute() which has
its own connection management. This could cause issues with transaction
handling when called at end of migration.
Changed to use explicit cursor with guaranteed commit:
- Use pg_conn.connection.cursor() to get a direct cursor
- Execute the INSERT ... ON CONFLICT query
- Explicitly call pg_conn.connection.commit()
- This matches the pattern used in other parts of the code
This ensures that final migration state (completed status, final counts)
are properly persisted to the database.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
When migration finishes, we need to update migration_state with:
1. The final actual row count from PostgreSQL
2. The final last_migrated_id (MAX(id) from the table)
3. Mark status as 'completed' (handled by _update_migration_state)
Previously, the final state update was missing, so migration_state
was left with stale data from the periodic updates.
Now _update_migration_state is called at the end to record the
authoritative final state.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
MySQL can contain invalid/zero dates like '0000-00-00' which cannot be
parsed with strptime. These should be treated as NULL and converted to
the default timestamp (1970-01-01 00:00:00).
Changes to _convert_date():
- Check for '0000-00-00' and invalid date strings
- Wrap strptime in try/except to catch ValueError
- Return None for invalid dates instead of crashing
- Updated callers to check for None and use default timestamp
This allows the migration to continue even when encountering invalid
historical dates in the MySQL database.
Fixes: "time data '0000-00-00' does not match format '%Y-%m-%d'"
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
When we import datetime from the datetime module, we get the datetime class,
not the module. This caused isinstance() checks to fail when checking against
datetime.date (which doesn't exist when datetime is a class).
Solution: Import date explicitly from datetime module and use it in isinstance
checks. Order matters - check datetime before date since datetime is a subclass
of date.
Fixes: "isinstance() arg 2 must be a type, a tuple of types, or a union"
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
When resuming migration, EventDate may be a string (from PostgreSQL queries)
instead of a datetime.date object (from MySQL). The combine() function expects
a datetime.date object, so we now convert strings to dates before combining
with time.
Added _convert_date() helper similar to _convert_time() that handles:
- str: Parse from "YYYY-MM-DD" format
- datetime.date: Return as-is
- datetime.datetime: Extract date component
Fixes error: "combine() argument 1 must be datetime.date, not str"
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The Rich progress bar has complexities with live mode that make it difficult
to get visual feedback working correctly. Since the migration is running well
and fast (~18-20k rows/sec), the progress bar visual feedback is nice-to-have
but not essential. Focus on what matters: the migration completing correctly.
The existing TransferSpeedColumn (Kb/s) still provides throughput feedback
which is the most important metric.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The print_status() method properly handles printing with the live progress
bar, whereas direct .print() calls don't work correctly with Progress in
live mode.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
For very large migrations (111M rows), the progress bar can appear frozen
when showing percentage-based progress on 60M+ remaining rows. Even at
20k rows/sec, progress moves slowly on screen.
Solution: Print periodic throughput updates every 1M rows processed.
Shows:
- Actual count processed and total
- Current throughput in rows/sec
- Elapsed time in hours
This gives users visual feedback that migration is actively processing
without needing to wait for percentage to visibly change.
Example output:
Progress: 5,000,000/111,000,000 items (18,500 items/sec, 4.2h elapsed)
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The previous fix was too aggressive - calling get_row_count() on every batch
meant executing COUNT(*) on a 14M row table for each batch. With a typical
batch size of ~10k rows and consolidation ratio of ~10:1, this meant:
- ~500-1000 batches total
- ~500k COUNT(*) queries on a huge table = completely destroyed performance
New approach:
- Keep local accumulator for migrated count (fast)
- Update total_rows_migrated to DB only every 10 batches (reduces COUNT(*) 50x)
- Update last_migrated_id on every batch via UPDATE (fast, no COUNT)
- Do final COUNT(*) at end of migration for accurate total
This maintains accuracy while being performant. The local count is reliable
because we're tracking inserts in a single sequential migration.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
The progress bar was appearing frozen because:
- Total was set to MySQL rows to process (111M)
- Progress was updated by PostgreSQL rows inserted (11M after consolidation)
- This created a 10:1 mismatch, making progress appear to crawl
Solution:
- Track progress based on MySQL rows processed (matches total)
- Use batch_size (MySQL rows) instead of inserted count (PostgreSQL rows)
- Change batch_max_id calculation to use original batch instead of transformed
This ensures the progress bar advances at a visible rate while still
maintaining accurate row count tracking from the database.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Replace session-level counting with direct table COUNT queries to ensure
total_rows_migrated always reflects actual reality in PostgreSQL. This fixes
the discrepancy where the counter was only tracking rows from the current session
and didn't account for earlier insertions or duplicates from failed resume attempts.
Key improvements:
- Use get_row_count() after each batch to get authoritative total
- Preserve previous count on resume and accumulate across sessions
- Remove dependency on error-prone session-level counters
- Ensures migration_state.total_rows_migrated matches actual table row count
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
