feat: auto-align Prometheus schemas in pending rows batching by v0y4g3r · Pull Request #7877 · GreptimeTeam/greptimedb

v0y4g3r · 2026-03-27T04:01:07Z

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What's changed and what's your intention?

This PR improves the Prometheus ingest batching path by aligning logical-table schemas to physical-table expectations in PendingRowsBatcher, reducing redundant table/partition work, and consolidating flush behavior for better throughput and simpler write flow.

Key changes:

Refactors pending-rows flush planning/execution to batch by physical table and streamline worker/flush logic.
Improves schema accommodation/alignment for Prometheus rows in prom_row_builder and related batching helpers, with clearer error handling.
Adds and updates metrics around flush stages and bulk-insert timing for better observability.
Adds/updates tests around batch transformation, schema handling, and batching behavior.
Includes accompanying docs/plans and related config/doc updates touched during this branch.

Compatibility intent:

No intentional API breakage.
No intentional incompatible schema/data format change; behavior remains backward compatible while improving ingest path handling.

Performance

With batching mode enabled, we can expect about 2x performance boost with 4 regions.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

I have written the necessary rustdoc comments.
I have added the necessary unit tests and integration tests.
This PR requires documentation updates.
API changes are backward compatible.
Schema or data changes are backward compatible.

gemini-code-assist

Code Review

This pull request implements physical table batching in the PendingRowsBatcher to optimize Prometheus remote writes by reducing RPC counts and partition lookup overhead. Key changes include the introduction of the PendingRowsSchemaAlterer trait, a more efficient row-to-batch alignment process in prom_row_builder.rs, and a new physical flush path that merges logical table data into a single BulkInsertRequest per physical region. The PR also refactors error handling in the frontend and exposes necessary utilities from the metric-engine crate. Reviewers suggested replacing unreachable! macros with robust error handling in the table creation logic to improve service reliability.

src/frontend/src/instance/prom_store.rs

Copilot

Pull request overview

This PR refactors the Prometheus remote-write batching/flush path to reduce redundant table/partition work by aligning logical-table schemas earlier (during batching), then flushing by physical table with improved observability and updated metric-engine support for physical bulk-insert passthrough.

Changes:

Introduces prom_row_builder utilities to align proto Rows directly into RecordBatches matching target table schemas (rename/reorder/cast/null-fill).
Refactors PendingRowsBatcher ingest planning (table create/alter batch ops) and flush logic to transform logical batches into physical format and write by physical regions.
Adds new flush-stage metrics and updates metric-engine bulk insert to accept already-physical batches.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/servers/src/prom_row_builder.rs	New helpers to convert proto rows to aligned Arrow `RecordBatch`es and derive create-table schemas/missing columns.
src/servers/src/pipeline.rs	Simplifies catalog error propagation by using `?` instead of wrapping with `CatalogSnafu`.
src/servers/src/pending_rows_batcher.rs	Major batching/flush refactor: table resolution planning, batch DDL hooks, physical-table flush pipeline, new flush-stage timing.
src/servers/src/metrics.rs	Adds `PENDING_ROWS_BATCH_FLUSH_STAGE_ELAPSED` histogram for flush-stage timing.
src/servers/src/lib.rs	Exposes new `prom_row_builder` module internally.
src/servers/src/http/prometheus.rs	Simplifies catalog error propagation by using `?`.
src/servers/src/http/event.rs	Simplifies catalog error propagation by using `?`.
src/servers/src/error.rs	Makes `Catalog` errors transparent and adds a `DataTypes` error variant.
src/servers/Cargo.toml	Adds `metric-engine` dependency for physical-batch transformation utilities.
src/metric-engine/src/test_util.rs	Adds `TestEnv::with_mito_config` helper for tests needing custom mito config.
src/metric-engine/src/lib.rs	Makes `batch_modifier` public for reuse by servers layer.
src/metric-engine/src/engine/bulk_insert.rs	Adds physical-region bulk-insert passthrough and timing metrics; expands tests.
src/metric-engine/src/batch_modifier.rs	Exposes `TagColumnInfo`, `compute_tsid_array`, and `modify_batch_sparse` publicly.
src/frontend/src/server.rs	Wires new `PendingRowsBatcher` ctor params (metric-engine flag + schema alterer instance).
src/frontend/src/instance/prom_store.rs	Implements `PendingRowsSchemaAlterer` in `Instance`, adds prom-remote-write create/alter batching and physical table creation.
src/frontend/src/instance/jaeger.rs	Simplifies catalog error propagation by using `?`.
src/frontend/src/instance/influxdb.rs	Simplifies catalog error propagation by using `?`.
src/frontend/src/instance/dashboard.rs	Simplifies catalog error propagation by using `?`.

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src/servers/src/prom_row_builder.rs

src/servers/src/pending_rows_batcher.rs

src/frontend/src/instance/prom_store.rs

src/servers/src/pending_rows_batcher.rs

src/servers/src/prom_row_builder.rs

fengjiachun · 2026-03-30T05:01:17Z

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src/metric-engine/src/engine/bulk_insert.rs

src/servers/src/pending_rows_batcher.rs

src/frontend/src/instance/prom_store.rs

fengjiachun

Rest LGTM

- **Error Handling Improvements**: - Removed `CatalogSnafu` context from various `.await` calls in `dashboard.rs`, `influxdb.rs`, `jaeger.rs`, `prometheus.rs`, `event.rs`, and `pipeline.rs` to streamline error handling. - **Prometheus Store Enhancements**: - Added support for auto-creating tables and adding missing Prometheus tag columns in `prom_store.rs` and `pending_rows_batcher.rs`. - Introduced `PendingRowsSchemaAlterer` trait for schema alterations in `pending_rows_batcher.rs`. - **Test Additions**: - Added tests for new Prometheus store functionalities in `prom_store.rs` and `pending_rows_batcher.rs`. - **Error Message Improvements**: - Enhanced error messages for catalog access in `error.rs`. - **Server Configuration Updates**: - Updated server configuration to include Prometheus store options in `server.rs`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Add DataTypes Error Handling and Column Renaming Logic - **`error.rs`**: Introduced a new `DataTypes` error variant to handle errors from `datatypes::error::Error`. Updated `ErrorExt` implementation to include `DataTypes`. - **`pending_rows_batcher.rs`**: Added functions `find_prom_special_column_names` and `rename_prom_special_columns_for_existing_schema` to handle renaming of special Prometheus columns. Updated `build_prom_create_table_schema` to simplify error handling with `ConcreteDataType`. - **Tests**: Added a test case `test_rename_prom_special_columns_for_existing_schema` to verify the renaming logic for Prometheus special columns. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- Refactored `PendingRowsBatcher` to accommodate Prometheus record batches: - Introduced `accommodate_record_batch_for_target_schema` to normalize incoming record batches against existing table schemas. - Removed `collect_missing_prom_tag_columns` and `rename_prom_special_columns_for_existing_schema` in favor of the new function. - Added `unzip_logical_region_schema` to extract schema components. - Updated tests in `pending_rows_batcher.rs`: - Added tests for `accommodate_record_batch_for_target_schema` to verify handling of missing tag columns and renaming of special columns. - Ensured error handling for missing timestamp and field columns in target schema. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Commit Summary - **Enhancement in Table Creation Logic**: Updated `prom_store.rs` to modify the handling of `table_options` during table creation. Specifically, `table_options` are now extended differently based on the `AutoCreateTableType`. For `Physical` tables, enforced `sst_format=flat` to optimize pending-rows writes by leveraging bulk memtables. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Enhance Performance Monitoring in `pending_rows_batcher.rs` - Added performance monitoring timers to various stages of the `PendingRowsBatcher` process, including schema cache checks, table resolution, schema creation, and record batch alignment. - Improved schema handling by adding timers around schema alteration and missing column addition processes. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Enhance Concurrent Write Handling**: Introduced `FlushRegionWrite` and `FlushWriteResult` structs to manage region writes and their results. Added `flush_region_writes_concurrently` function to handle concurrent flushing of region writes based on `should_dispatch_concurrently` logic in `pending_rows_batcher.rs`. - **Testing Enhancements**: Added tests for concurrent dispatching of region writes and the logic for determining concurrent dispatch in `pending_rows_batcher.rs`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Add Histogram for Flush Stage Elapsed Time - **`metrics.rs`**: Introduced a new `HistogramVec` named `PENDING_ROWS_BATCH_FLUSH_STAGE_ELAPSED` to track the elapsed time of pending rows batch flush stages. - **`pending_rows_batcher.rs`**: Replaced instances of `PENDING_ROWS_BATCH_INGEST_STAGE_ELAPSED` with `PENDING_ROWS_BATCH_FLUSH_STAGE_ELAPSED` to measure the elapsed time for various flush stages, including `flush_write_region`, `flush_concat_table_batches`, `flush_resolve_table`, `flush_fetch_partition_rule`, `flush_split_record_batch`, `flush_filter_record_batch`, `flush_resolve_region_leader`, and `flush_encode_ipc`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

…cher

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

**Refactor `flush_batch` and `flush_batch_physical` functions** - Removed unused `catalog` and `schema` variables from `flush_batch` in `pending_rows_batcher.rs`. - Updated `flush_batch_physical` to directly use `ctx.current_catalog()` and `ctx.current_schema()` for resolving table names. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Remove Unused Function and Associated Test - **File:** `src/servers/src/prom_row_builder.rs` - Removed the unused function `build_prom_create_table_schema` which was responsible for building a `Vec<ColumnSchema>` from an Arrow schema. - Deleted the associated test `test_build_prom_create_table_schema_from_request_schema` that validated the removed function. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Remove Test**: Deleted the `test_bulk_insert_records_elapsed_metric` test from `bulk_insert.rs`. - **Refactor Table Resolution**: Introduced `TableResolutionPlan` struct and refactored table resolution logic in `pending_rows_batcher.rs`. - **Enhance Table Handling**: Added functions for collecting non-empty table rows, unique table schemas, and handling table creation and alteration in `pending_rows_batcher.rs`. - **Add Tests**: Implemented tests for `collect_non_empty_table_rows` and `collect_unique_table_schemas` in `pending_rows_batcher.rs`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Refactor Error Handling**: Updated error handling in `pending_rows_batcher.rs` and `prom_row_builder.rs` to use `Snafu` error context for more descriptive error messages. - **Remove Unused Functionality**: Eliminated the `rows_to_record_batch` function and related test in `prom_row_builder.rs` as it was redundant. - **Simplify Function Return Types**: Modified `rows_to_aligned_record_batch` in `prom_row_builder.rs` to return only `RecordBatch` without missing columns, simplifying the function's interface and related tests. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Add Helper Function for Table Options in `prom_store.rs` - Introduced `fill_metric_physical_table_options` function to encapsulate logic for setting table options, ensuring the use of flat SST format and physical table metadata. - Updated `Instance` implementation to utilize the new helper function for setting table options. - Added a unit test `test_metric_physical_table_options_forces_flat_sst_format` to verify the correct application of table options. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Refactor `PendingRowsBatcher`**: Simplified worker retrieval logic in `get_or_spawn_worker` method by using a more concise conditional check. - **Metrics Update**: Added `PENDING_ROWS_BATCH_FLUSH_STAGE_ELAPSED` metric in `pending_rows_batcher.rs`. - **Remove Unused Code**: Deleted multiple test functions related to record batch alignment and schema preparation in `pending_rows_batcher.rs` and `prom_row_builder.rs`. - **Function Visibility Change**: Made `build_prom_create_table_schema_from_proto` public in `prom_row_builder.rs`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Refactor and Simplify Schema Alteration Logic - **Removed Unused Methods**: Deleted `create_table_if_missing` and `add_missing_prom_tag_columns` methods from `PendingRowsSchemaAlterer` trait in `prom_store.rs` and `pending_rows_batcher.rs`. - **Error Handling Improvement**: Enhanced error handling in `create_tables_if_missing_batch` method to return a specific error message for unsupported `AutoCreateTableType` in `prom_store.rs`. - **Visibility Change**: Made `as_str` method public in `AutoCreateTableType` enum in `insert.rs` to support external access. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Commit Message Improve safety in `prom_row_builder.rs` - Updated `unzip_logical_region_schema` to use `saturating_sub` for safer capacity calculation of `tag_columns`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Add TODO comments for future improvements in `pending_rows_batcher.rs` - Added a TODO comment to consider bounding the `flush_region_writes_concurrently` function. - Added a TODO comment to potentially limit the maximum rows to concatenate in the `flush_batch_physical` function. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Commit Message Enhance error handling in `pending_rows_batcher.rs` - Updated `collect_unique_table_schemas` to return a `Result` type, enabling error handling for duplicate table names. - Modified the function to return an error when duplicate table names are found in `table_rows`. - Adjusted test cases to handle the new `Result` return type in `collect_unique_table_schemas`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Refactor `partition_columns` Method**: Updated the `partition_columns` method in `multi_dim.rs`, `partition.rs`, and `splitter.rs` to return a slice reference instead of a cloned vector, improving performance by avoiding unnecessary cloning. - **Enhance Partition Handling**: Added functions `collect_tag_columns_and_non_tag_indices` and `strip_partition_columns_from_batch` in `pending_rows_batcher.rs` to manage partition columns more efficiently, including stripping partition columns from record batches. - **Update Tests**: Modified existing tests and added new ones in `pending_rows_batcher.rs` to verify the functionality of partition column handling, ensuring correct behavior of the new methods. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Enhance Schema Handling and Validation in `pending_rows_batcher.rs` - **Schema Validation Enhancements**: - Added checks for essential columns (`timestamp`, `value`) in `collect_tag_columns_and_non_tag_indices`. - Introduced `PHYSICAL_REGION_ESSENTIAL_COLUMN_COUNT` to ensure minimum column count in `strip_partition_columns_from_batch`. - Improved error handling for unexpected data types and duplicated columns. - **Function Modifications**: - Updated `strip_partition_columns_from_batch` to project essential columns without lookup. - Modified `flush_batch_physical` to use `essential_col_indices` instead of `non_tag_indices`. - **Test Enhancements**: - Added tests for schema validation, including checks for unexpected data types and duplicated columns. - Verified correct projection of essential columns in `strip_partition_columns_from_batch`. Files affected: `pending_rows_batcher.rs`, `tests`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

- **Add `smallvec` Dependency**: Updated `Cargo.lock` and `Cargo.toml` to include `smallvec` as a workspace dependency. - **Refactor Function**: Renamed `collect_tag_columns_and_non_tag_indices` to `columns_taxonomy` in `pending_rows_batcher.rs` and updated its return type to use `SmallVec`. - **Update Tests**: Modified test cases in `pending_rows_batcher.rs` to reflect changes in function name and return type. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

**Refactor `pending_rows_batcher.rs` to Simplify Table ID Handling** - Updated `TableBatch` struct to use `TableId` directly instead of `Option<u32>` for `table_id`. - Simplified logic in `flush_batch_physical` by removing the check for `None` in `table_id`. - Adjusted related logic in `start_worker` to accommodate the change in `table_id` handling. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Enhance Batch Processing Logic - **`pending_rows_batcher.rs`**: - Moved column taxonomy resolution inside the loop to handle schema variations across batches. - Added checks to skip processing if both tag columns and essential column indices are empty. - **Tests**: - Added `test_modify_batch_sparse_with_taxonomy_per_batch` to verify batch modification logic with varying schemas. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Remove Primary Key Column Check in `pending_rows_batcher.rs` - Removed the check for the primary key column and other essential column names in the function `strip_partition_columns_from_batch` within `pending_rows_batcher.rs`. - Simplified the logic by eliminating the validation of column order against expected essential names. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Refactor error handling and iteration in `otlp.rs` and `pending_rows_batcher.rs` - **`otlp.rs`**: Simplified error handling by removing `CatalogSnafu` context when awaiting table retrieval. - **`pending_rows_batcher.rs`**: Streamlined iteration over tables by removing unnecessary `into_iter()` calls, improving code readability and efficiency. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Add timing metrics for batch processing in `pending_rows_batcher.rs` - Introduced `modify_elapsed` and `columns_taxonomy_elapsed` to measure time spent in `modify_batch_sparse` and `columns_taxonomy` functions. - Updated `flush_batch_physical` to record these metrics using `PENDING_ROWS_BATCH_FLUSH_STAGE_ELAPSED`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

src/metric-engine/src/batch_modifier.rs

src/servers/src/prom_row_builder.rs

src/servers/src/pending_rows_batcher.rs

src/metric-engine/src/batch_modifier.rs

### Commit Summary - **Remove Unused Code**: Eliminated the `#[allow(dead_code)]` attribute from the `compute_tsid_array` function in `batch_modifier.rs`. - **Error Handling Improvement**: Enhanced error handling in `flush_batch_physical` function by adjusting the `match` block in `pending_rows_batcher.rs`. - **Simplify Logic**: Streamlined the logic in `rows_to_aligned_record_batch` by removing unnecessary type casting in `prom_row_builder.rs`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

**Refactor `flush_batch_physical` in `pending_rows_batcher.rs`:** - Moved partition column stripping logic to a single location before processing region batches. - Updated the use of `combined_batch` to `stripped_batch` for consistency in batch processing. - Removed redundant partition column stripping logic within the region batch loop. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

### Update `batch_modifier.rs` Documentation and Parameter Naming - Enhanced documentation for `compute_tsid_array` and `modify_batch_sparse` functions to clarify their logic and parameters. - Renamed parameter `non_tag_column_indices` to `extra_column_indices` in `modify_batch_sparse` for better clarity. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Copilot AI review requested due to automatic review settings March 27, 2026 04:01

v0y4g3r requested review from a team, WenyXu and waynexia as code owners March 27, 2026 04:01

github-actions bot added size/XXL documentation docs-required This change requires docs update. labels Mar 27, 2026

sunng87 mentioned this pull request Mar 27, 2026

Update docs for feat: auto-align Prometheus schemas in pending rows batching GreptimeTeam/docs#2384

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github-actions bot added docs-not-required This change does not impact docs. and removed docs-required This change requires docs update. labels Mar 27, 2026

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evenyag mentioned this pull request Mar 30, 2026

Release v1.0.0 #7883

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v0y4g3r added 10 commits March 31, 2026 14:20

reformat

222d61c

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Add design doc for physical table batching in PendingRowsBatcher

31f5554

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

Add implementation plan for physical table batching in PendingRowsBat…

539db4f

…cher

v0y4g3r added 19 commits March 31, 2026 14:20

remove flush per logical region

c10ca44

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

chore: remove plan

3c19a0b

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

feat/auto-schema-align:

845d0b6

### Commit Message Improve safety in `prom_row_builder.rs` - Updated `unzip_logical_region_schema` to use `saturating_sub` for safer capacity calculation of `tag_columns`. Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

v0y4g3r force-pushed the feat/auto-schema-align branch from ab0d309 to b2d9923 Compare March 31, 2026 06:41

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evenyag added this pull request to the merge queue Apr 1, 2026

Merged via the queue into GreptimeTeam:main with commit 2b4e12c Apr 1, 2026
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v0y4g3r commented Mar 27, 2026 •

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