This is an automated email from the ASF dual-hosted git repository.
hanahmily pushed a commit to branch sidx/snapshot
in repository https://gitbox.apache.org/repos/asf/skywalking-banyandb.git
commit e7e1a1a240c8103a82cabb98497f9da64070c625
Author: Gao Hongtao <hanahm...@gmail.com>
AuthorDate: Thu Aug 21 18:13:04 2025 +0700
Update TODO.md to reflect current progress on secondary index implementation
- Summarized completed phases (1-5) and their respective tasks, totaling 25
completed out of 40.
- Listed remaining phases (6-9) and tasks, with a focus on upcoming query
path, flush operations, merge operations, and testing.
- Updated the file creation checklist to highlight remaining implementation
and test files.
- Adjusted success criteria to reflect the completion of initial phases and
outline requirements for remaining tasks.
---
banyand/internal/sidx/TODO.md | 358 +++++-------------------------------------
1 file changed, 36 insertions(+), 322 deletions(-)
diff --git a/banyand/internal/sidx/TODO.md b/banyand/internal/sidx/TODO.md
index 94b1a39e..2e1fda97 100644
--- a/banyand/internal/sidx/TODO.md
+++ b/banyand/internal/sidx/TODO.md
@@ -4,296 +4,23 @@ This document tracks the implementation progress of the
Secondary Index File Sys
## Implementation Progress Overview
-- [x] **Phase 1**: Core Data Structures (6 tasks) - 6/6 completed ✅
-- [x] **Phase 2**: Interface Definitions (5 tasks) - 5/5 completed ✅ **CORE
INTERFACES READY**
-- [x] **Phase 3**: Mock Implementations (4 tasks) - 4/4 completed ✅ **MOCK
COMPONENTS READY**
-- [x] **Phase 4**: Memory Management (4 tasks) - 4/4 completed ✅ **MEMORY
SYSTEM READY**
-- [x] **Phase 5**: Snapshot Management (4 tasks) - 4/4 completed ✅ **SNAPSHOT
SYSTEM READY**
+**Completed Phases (25 tasks)**: ✅
+- Phase 1: Core Data Structures (6 tasks)
+- Phase 2: Interface Definitions (5 tasks)
+- Phase 3: Mock Implementations (4 tasks)
+- Phase 4: Memory Management (4 tasks)
+- Phase 5: Snapshot Management (6 tasks)
+
+**Remaining Phases**:
- [ ] **Phase 6**: Query Path (5 tasks)
- [ ] **Phase 7**: Flush Operations (4 tasks)
- [ ] **Phase 8**: Merge Operations (4 tasks)
- [ ] **Phase 9**: Testing (4 tasks)
-**Total Tasks**: 40
+**Total Tasks**: 40 (25 completed, 15 remaining)
---
-## Phase 1: Core Data Structures
-
-### 1.1 Element and Elements Types (`element.go`) ✅
-- [x] Create element struct with seriesID, userKey, data, tags
-- [x] Implement pooling with reset methods for memory efficiency
-- [x] Add size calculation methods
-- [x] **Test Cases**:
- - [x] Pool allocation and deallocation correctness
- - [x] Element reset functionality preserves nothing
- - [x] Memory reuse reduces allocations
- - [x] Size calculation accuracy
-
-### 1.2 Tag Structure (`tag.go`) ✅
-- [x] Individual tag handling (not tag families like stream module)
-- [x] Support for tag data, metadata, filter files
-- [x] Implement tag value marshaling/unmarshaling
-- [x] **Test Cases**:
- - [x] Tag encoding/decoding with various value types
- - [x] Value type handling (int64, string, bytes)
- - [x] Filter generation for indexed tags
- - [x] Tag serialization round-trip integrity
-
-### 1.3 Metadata Structures (`metadata.go`) ✅
-- [x] partMetadata with MinKey/MaxKey (replacing timestamps)
-- [x] blockMetadata with block offsets and key ranges
-- [x] Validation methods for metadata integrity
-- [x] **Test Cases**:
- - [x] Metadata serialization/deserialization
- - [x] Key range validation (MinKey <= MaxKey)
- - [x] Version compatibility checks
- - [x] Corruption detection in metadata
-
-### 1.4 Block Structure (`block.go`) 🔥 - DESIGN COMPLETED ✅
-- [x] **Core block structure**: userKeys[], elementIDs[], data[], tags map
-- [x] **Block components design**: Block, Block Metadata, Block Reader, Block
Scanner, Block Writer
-- [x] **Memory management**: Object pooling with reset() methods
-- [x] **Block operations**: mustInitFromElements(), validate(),
uncompressedSizeBytes()
-- [x] **Tag processing**: processTag() for individual tag handling within
blocks
-- [x] **Component relationships**: Dependency diagram and interaction patterns
-- [x] **File organization**: Block storage within part directories
-- [x] **Implementation Tasks**:
- - [x] Create block.go with core block structure
- - [x] Implement reset() and validation methods
- - [x] Add mustInitFromElements() for block initialization
- - [x] Implement processTag() for tag data organization
- - [x] Add size calculation methods
-- [x] **Test Cases**:
- - [x] Block initialization from sorted elements
- - [x] Key ordering validation within blocks
- - [x] Block reset and reuse functionality
- - [x] Tag processing and bloom filter generation
- - [x] Memory pooling effectiveness
-
-### 1.5 Part Structure (`part.go`) ✅
-- [x] File readers for primary.bin, data.bin, keys.bin, meta.bin
-- [x] Individual tag file readers (*.td, *.tm, *.tf)
-- [x] Part opening/closing lifecycle
-- [x] **Test Cases**:
- - [x] File lifecycle management
- - [x] Reader management and cleanup
- - [x] Memory mapping efficiency
- - [x] Error handling for corrupted files
-
-### 1.6 PartWrapper with Reference Counting (`part_wrapper.go`) ✅
-- [x] Atomic reference counting for safe concurrent access
-- [x] Thread-safe acquire/release methods
-- [x] State management (active, removing, removed)
-- [x] **Test Cases**:
- - [x] Concurrent reference counting under load
- - [x] Proper cleanup when reference count reaches zero
- - [x] State transitions work correctly
- - [x] No race conditions in reference management
-
----
-
-## Phase 2: Interface Definitions 🔥 **NEW - FOR CORE STORAGE REVIEW**
-
-### 2.1 Main SIDX Interface (`interfaces.go`) ✅
-- [x] Define core SIDX interface with primary methods
-- [x] Add Write([]WriteRequest) error method signature (batch-only)
-- [x] Add Query(QueryRequest) (QueryResult, error) method signature (BanyanDB
pattern)
-- [x] Add administrative methods (Stats, Close) - removed Health per user
request
-- [x] **Test Cases**:
- - [x] Interface definition compiles correctly
- - [x] Method signatures match design specification
- - [x] Documentation examples are comprehensive
- - [x] Interface supports all planned use cases
-
-### 2.2 Component Interfaces (`interfaces.go`) ✅
-- [x] Define Writer interface for write operations
-- [x] Define Querier interface for query operations
-- [x] Define Flusher interface with Flush() error method
-- [x] Define Merger interface with Merge() error method
-- [x] **Test Cases**:
- - [x] All interfaces are properly decoupled
- - [x] Interface composition works correctly
- - [x] Type assertions and casting work as expected
- - [x] Interface documentation is complete
-
-### 2.3 Request/Response Types (`interfaces.go`) ✅
-- [x] Define WriteRequest struct with SeriesID, Key, Data, Tags
-- [x] Define QueryRequest struct with KeyRange, TagFilters, Options
-- [x] Define QueryResponse struct with Elements, Metadata (corrected to use
individual Tags)
-- [x] Add validation methods for all request types
-- [x] **Test Cases**:
- - [x] Request/response serialization works correctly
- - [x] Validation catches invalid requests
- - [x] Type safety is maintained across operations
- - [x] Memory pooling integration is ready
-
-### 2.4 Configuration Interfaces (`options.go`) ✅
-- [x] Define Options struct for SIDX configuration
-- [x] Add path where the files are put.
-- [x] Add protector.Memory to control the resource limit.
-- [x] Add *mergePolicy to control merge behaviour.
-- [x] **Test Cases**:
- - [x] Default configurations are sensible
- - [x] Configuration validation works correctly
- - [x] Options can be merged and overridden
-
-### 2.5 Interface Documentation and Examples (`interfaces_examples.go`) ✅
-- [x] Create comprehensive interface usage examples
-- [x] Document integration patterns with core storage
-- [x] Add performance considerations and best practices
-- [x] Create interface contract specifications
-- [x] **Test Cases**:
- - [x] All examples compile and run correctly
- - [x] Documentation covers error handling patterns
- - [x] Integration examples are realistic
- - [x] Contract specifications are testable
-
----
-
-## Phase 3: Mock Implementations 🔥 **NEW - FOR EARLY TESTING**
-
-### 3.1 Mock SIDX Implementation (`mock_sidx.go`) ✅
-- [x] Create in-memory mock of main SIDX interface
-- [x] Implement Write() with basic in-memory storage
-- [x] Implement Query() with linear search and filtering
-- [x] Add configurable delays and error injection
-- [x] **Test Cases**:
- - [x] Mock maintains data consistency
- - [x] Write/read round-trip works correctly
- - [x] Query filtering produces correct results
- - [x] Error injection works as expected
-
-### 3.2 Mock Component Implementations (`mock_components.go`) ✅
-- [x] Create mock Writer with element accumulation
-- [x] Create mock Querier with range filtering
-- [x] Create mock Flusher with no-op operations
-- [x] Create mock Merger with simple consolidation
-- [x] **Test Cases**:
- - [x] All mock components integrate correctly
- - [x] Mock behavior is configurable and predictable
- - [x] Component interactions work as designed
- - [x] Performance characteristics are documented
-
-### 3.3 Integration Test Framework (`integration_test_framework.go`) ✅
-- [x] Create test harness using mock implementations
-- [x] Add scenario testing for common use cases
-- [x] Implement benchmarking framework for interface performance
-- [x] Add stress testing with configurable load patterns
-- [x] **Test Cases**:
- - [x] Framework supports all interface methods
- - [x] Scenarios cover realistic usage patterns
- - [x] Benchmarks provide meaningful metrics
- - [x] Stress tests reveal performance limits
-
-### 3.4 Mock Documentation and Usage Guide (`mock_usage.md`) ✅
-- [x] Document mock implementation capabilities and limitations
-- [x] Provide integration examples for core storage team
-- [x] Create migration guide from mocks to real implementation
-- [x] Add troubleshooting guide for common issues
-- [x] **Test Cases**:
- - [x] Documentation examples work correctly
- - [x] Integration guide is complete and accurate
- - [x] Migration path is clearly defined
- - [x] Troubleshooting covers real scenarios
-
----
-
-## Phase 4: Memory Management
-
-### 4.1 MemPart Implementation (`mempart.go`) ✅
-- [x] In-memory buffer before flushing to disk
-- [x] Element accumulation with size tracking
-- [x] Memory usage monitoring
-- [x] **Test Cases**:
- - [x] Memory part creation and lifecycle
- - [x] Size limits enforcement
- - [x] Element addition and retrieval
- - [x] Memory usage tracking accuracy
-
-### 4.2 Block Writer (`block_writer.go`)
-- [x] **Multi-file writing**: meta.bin, primary.bin data.bin, keys.bin, *.td,
*.tf, *.tm files
-- [x] **Compression**: zstd compression for data payloads
-- [x] **Write tracking**: Track bytes written per file
-- [x] **Memory management**: Object pooling with reset() methods
-- [x] **Atomic operations**: mustWriteTo() for block serialization
-- [x] **Test Cases**:
- - [x] Block serialization with various data sizes
- - [x] Compression ratios meet expectations
- - [x] Data integrity after compression/decompression
- - [x] Block writer reuse and pooling
-
-### 4.3 Element Sorting (`elements.go`) ✅
-- [x] Sort by seriesID first, then userKey
-- [x] Efficient in-place sorting algorithms
-- [x] Validation of sort order
-- [x] **Test Cases**:
- - [x] Sorting correctness with various data sizes
- - [x] Sorting stability preserves order of equal elements
- - [x] Performance benchmarks for large datasets
- - [x] Edge cases (empty, single element, duplicate keys)
-
-### 4.4 Block Initialization (`block.go` methods) ✅
-- [x] **mustInitFromElements()**: Process sorted elements into blocks
-- [x] **mustInitFromTags()**: Process tag data for blocks
-- [x] **processTag()**: Create tag data structures with bloom filters
-- [x] **Key validation**: Verify sorting and consistency
-- [x] **Tag optimization**: Bloom filters for indexed tags, min/max for int64
tags
-- [x] **Implementation Tasks**:
- - [x] Implement mustInitFromElements() with element processing
- - [x] Add mustInitFromTags() for tag data organization
- - [x] Create processTag() with bloom filter generation
- - [x] Add validation for element ordering
-- [x] **Test Cases**:
- - [x] Block building from various element configurations
- - [x] Validation errors for unsorted elements
- - [x] Edge cases (empty elements, single series)
- - [x] Memory usage during block initialization
-
----
-
-## Phase 5: Snapshot Management
-
-### 5.1 Snapshot Structure (`snapshot.go`) ✅
-- [x] Part collection with epoch tracking
-- [x] getParts() filters by key range
-- [x] Reference counting for snapshot safety
-- [x] **Test Cases**:
- - [x] Snapshot creation with various part configurations
- - [x] Part filtering accuracy by key range
- - [x] Reference counting prevents premature cleanup
- - [x] Snapshot immutability guarantees
-
-### 5.2 Introducer Loop (`introducer.go`) ✅
-- [x] Background goroutine for snapshot coordination
-- [x] Channel-based communication for thread safety
-- [x] Epoch increment management
-- [x] **Test Cases**:
- - [x] Channel operations work under load
- - [x] Sequential processing maintains order
- - [x] Graceful shutdown handling
- - [x] No deadlocks in channel communication
-
-### 5.3 Introduction Types (`introducer.go`) ✅
-- [x] memIntroduction, flusherIntroduction, mergerIntroduction
-- [x] Object pooling for introduction structures
-- [x] Channel synchronization with applied notifications
-- [x] **Test Cases**:
- - [x] Introduction pooling reduces allocations
- - [x] Channel synchronization correctness
- - [x] Applied notifications work reliably
- - [x] Introduction reset for reuse
-
-### 5.4 Snapshot Replacement (`snapshot.go`) ✅
-- [x] Atomic updates with reference counting
-- [x] Safe concurrent read access during replacement
-- [x] Old snapshot cleanup after reference release
-- [x] **Test Cases**:
- - [x] Atomic replacement under concurrent load
- - [x] Concurrent reads see consistent data
- - [x] No data races during replacement
- - [x] Memory leaks prevented through reference counting
-
---
## Phase 6: Query Path
@@ -490,36 +217,16 @@ This document tracks the implementation progress of the
Secondary Index File Sys
---
-## File Creation Checklist
-
-### Core Implementation Files
-- [ ] `sidx.go` - Main interface and SIDX struct
-- [ ] `element.go` - Element structures and pooling
-- [ ] `tag.go` - Tag handling and encoding
-- [ ] `part.go` - Part structure and file management
-- [ ] `part_wrapper.go` - Reference counting wrapper
-- [ ] `mempart.go` - In-memory part implementation
-- [ ] `block.go` - Block structure and operations 🔥
-- [ ] `block_writer.go` - Block serialization 🔥
+## Remaining File Creation Checklist
+
+### Core Implementation Files (Remaining)
- [ ] `block_reader.go` - Block deserialization 🔥
- [ ] `block_scanner.go` - Block scanning for queries 🔥
-- [ ] `snapshot.go` - Snapshot management
-- [ ] `introducer.go` - Introducer loop coordination
- [ ] `flusher.go` - Flush operations
- [ ] `merger.go` - Merge operations
-- [ ] `writer.go` - Write path implementation
- [ ] `query.go` - Query interface and execution
-- [ ] `metadata.go` - Metadata structures
-- [ ] `options.go` - Configuration options
-
-### Test Files
-- [ ] `sidx_test.go` - Main test suite
-- [ ] `element_test.go` - Element testing
-- [ ] `tag_test.go` - Tag testing
-- [ ] `part_test.go` - Part testing
-- [ ] `block_test.go` - Block testing 🔥
-- [ ] `snapshot_test.go` - Snapshot testing
-- [ ] `introducer_test.go` - Introducer testing
+
+### Test Files (Remaining)
- [ ] `flusher_test.go` - Flusher testing
- [ ] `merger_test.go` - Merger testing
- [ ] `writer_test.go` - Writer testing
@@ -528,9 +235,14 @@ This document tracks the implementation progress of the
Secondary Index File Sys
- [ ] `integration_test.go` - Integration tests
- [ ] `concurrency_test.go` - Concurrency tests
+### Completed Files ✅
+**Core Implementation**: `sidx.go`, `element.go`, `tag.go`, `part.go`,
`part_wrapper.go`, `mempart.go`, `block.go`, `block_writer.go`, `snapshot.go`,
`introducer.go`, `metadata.go`, `options.go`
+
+**Test Files**: `sidx_test.go`, `element_test.go`, `tag_test.go`,
`part_test.go`, `block_test.go`, `snapshot_test.go`, `introducer_test.go`
+
---
-## Success Criteria for Each Phase
+## Success Criteria for Remaining Phases
### Phase Completion Requirements
- [ ] All tasks in phase completed
@@ -542,7 +254,8 @@ This document tracks the implementation progress of the
Secondary Index File Sys
- [ ] Documentation updated
### Overall Success Criteria
-- [ ] All 40 tasks completed
+- [x] Phases 1-5 completed (25/40 tasks) ✅
+- [ ] Remaining 15 tasks completed
- [ ] Full test suite passes
- [ ] Performance meets design targets
- [ ] Code review approval
@@ -553,12 +266,14 @@ This document tracks the implementation progress of the
Secondary Index File Sys
## Block.go Usage Summary 🔥
-The `block.go` file is central to the SIDX implementation and is used in
multiple phases:
+The `block.go` file is central to the SIDX implementation and will be used in
remaining phases:
-1. **Phase 1.4**: Initial block structure creation
-2. **Phase 2.2**: Block writer uses block for serialization
-3. **Phase 2.4**: Block initialization from elements
-4. **Phase 4.4**: Create blocks when memory threshold reached
+**Completed Usage** ✅:
+1. **Phase 1.4**: Block structure creation and initialization
+2. **Phase 4.2**: Block writer serialization
+3. **Phase 4.4**: Block initialization from elements
+
+**Remaining Usage**:
5. **Phase 6.3**: Block scanner reads blocks during queries
6. **Phase 6.5**: Block reader deserializes blocks
7. **Phase 7.4**: Serialize blocks to disk during flush
@@ -568,14 +283,13 @@ The `block.go` file is central to the SIDX implementation
and is used in multipl
---
-## Dependencies Between Tasks
+## Dependencies Between Remaining Tasks
+
+**Completed Foundation** ✅:
+- Phases 1-5 provide all core data structures, interfaces, memory management,
and snapshot management
-- **Phase 1** must complete before **Phase 2** (data structures needed)
-- **Phase 2** must complete before **Phase 4** (memory management needed for
writes)
-- **Phase 3** must complete before **Phase 4** (snapshot management needed)
-- **Phase 4** must complete before **Phase 5** (memory management needed for
snapshot)
-- **Phase 5** must complete before **Phase 6** (snapshot management needed for
queries)
+**Remaining Dependencies**:
- **Phase 6** can be developed independently (queries work with existing
persisted data)
-- **Phase 5** must complete before **Phase 7** (snapshot management needed for
flush)
-- **Phase 7** must complete before **Phase 8** (flush needed for merge)
+- **Phase 7** requires completed snapshot management from Phase 5 ✅
+- **Phase 8** requires Phase 7 completion (flush needed for merge)
- **Phase 9** requires completion of relevant phases for testing
