Add missing MongoDB sharding configuration for version vectors #1097
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WalkthroughThe changes in this pull request introduce a new collection configuration for sharding in the MongoDB setup, specifically adding a collection named Changes
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (3)
build/charts/yorkie-cluster/charts/yorkie-mongodb/values.yaml (1)
60-64: Sharding configuration follows established patternsThe configuration for
versionvectorscollection follows the same pattern as other document-related collections, which is good for consistency. Theunique: falsesetting is correct as uniqueness is handled by the compound index inindexes.go.Consider documenting the following aspects:
- Expected data volume and growth patterns
- Rationale for choosing
doc_idas the shard key- Impact on query patterns and data distribution
design/mongodb-sharding.md (2)
200-200: Add language specification to code block.The code block showing ObjectID format should specify the language for better syntax highlighting.
-``` +```text TimeStamp(4 bytes) + MachineId(3 bytes) + ProcessId(2 bytes) + Counter(3 bytes)
185-190: Consider prioritizing risk mitigation approaches.The document lists multiple approaches for handling client_id duplication and future scalability. Consider adding a recommendation section that:
- Evaluates trade-offs for each approach
- Suggests a preferred approach based on current scale
- Defines triggers for when to switch approaches
For example, using
client_key + client_idmight be the simplest to implement initially, while the cluster-level GUID generator could be the long-term solution when scale demands it.Also applies to: 208-211
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📒 Files selected for processing (4)
build/charts/yorkie-cluster/charts/yorkie-mongodb/values.yaml(1 hunks)build/docker/sharding/scripts/init-mongos1.js(1 hunks)design/mongodb-sharding.md(10 hunks)server/backend/database/mongo/indexes.go(1 hunks)
🧰 Additional context used
🪛 LanguageTool
design/mongodb-sharding.md
[typographical] ~164-~164: Two consecutive commas
Context: ...eplica set): - shard1-1,shard1-2, shard1-3 - shard2-1,shard2-2, shard2-3 - shard3-1,`s...
(DOUBLE_PUNCTUATION)
[typographical] ~165-~165: Two consecutive commas
Context: ..., shard1-3 - shard2-1,shard2-2, shard2-3 - shard3-1,shard3-2, shard3-3 - 2 Mongos: `mong...
(DOUBLE_PUNCTUATION)
🪛 Markdownlint (0.35.0)
design/mongodb-sharding.md
201-201: null
Fenced code blocks should have a language specified
(MD040, fenced-code-language)
🔇 Additional comments (6)
build/docker/sharding/scripts/init-mongos1.js (1)
26-26: Verify shard key selection for version vectors collection
The doc_id shard key aligns with other document-related collections, but we should ensure this provides optimal distribution for version vectors data.
Consider monitoring shard distribution patterns after deployment to ensure even data distribution.
Also applies to: 46-46
✅ Verification successful
Based on the results, I can now generate the final response as we have sufficient information about the sharding strategy from the design documents.
Shard key selection for version vectors collection is appropriate
The doc_id shard key for version vectors aligns with the documented sharding strategy in design/mongodb-sharding.md. The design explicitly states that document-wide operations use doc_id as a ranged shard key, which is consistent with this implementation. This choice ensures version vectors data follows the same distribution pattern as other document-related collections, maintaining data locality and efficient querying patterns.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Analyze shard key distribution pattern
# Check for any existing patterns in doc_id distribution that might affect sharding
# Look for any comments or documentation about sharding strategy
rg -A 3 "shard.*strategy|shard.*pattern"
# Check for any existing version vectors implementations
ast-grep --pattern 'class $_ {
$$$
versionVector($$$) {
$$$
}
$$$
}'
Length of output: 2328
server/backend/database/mongo/indexes.go (1)
Line range hint 177-182: Index optimization aligns with sharding strategy
The compound index with doc_id as the leading field supports the sharding configuration while maintaining uniqueness constraints. However, consider the following:
- The index order supports sharding but verify if it covers the most common query patterns
- The unique constraint on all three fields matches the data integrity requirements
✅ Verification successful
Index optimization aligns with sharding strategy and query patterns
Based on the codebase analysis, the compound index with doc_id as the leading field is well-aligned with both the sharding strategy and the main query patterns:
- The index supports the sharding configuration as evidenced in
build/docker/sharding/scripts/init-mongos1.jswhereversionvectorscollection is sharded ondoc_id - The query patterns from
server/backend/database/mongo/client.goshow that lookups are primarily done usingproject_idanddoc_id, which the index covers efficiently - The unique constraint on
(doc_id, project_id, client_id)matches the data model requirements as shown indesign/mongodb-sharding.mdwhere version vectors are identified by this composite key
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Analyze query patterns and index usage
# Look for query patterns in the codebase
# Search for queries on version vectors
rg -A 3 "find.*versionvectors|aggregate.*versionvectors"
# Look for field access patterns
ast-grep --pattern 'db.$$$versionvectors$$$find($$$)'
Length of output: 114
Script:
#!/bin/bash
# Let's try different search patterns to find version vector related queries
# Search for collection name references
rg -i "versionvectors|version_vectors" -A 3
# Search for specific mongo operations on collections
rg "Find\(|Aggregate\(" -A 3 "server/backend/database/mongo"
# Look for struct definitions and methods related to version vectors
ast-grep --pattern 'type $_ struct {
$$$
VersionVector $$$
$$$
}'
# Search for mongo operation methods
ast-grep --pattern 'func ($_ *$_) Find($$$) {
$$$
}'
Length of output: 20152
build/charts/yorkie-cluster/charts/yorkie-mongodb/values.yaml (1)
Line range hint 26-26: Cross-file consistency verification
The sharding implementation is consistent across all files:
init-mongos1.js: Adds sharding operationsindexes.go: Optimizes index for shardingvalues.yaml: Configures sharding rules
Also applies to: 46-46, 177-182, 60-64
✅ Verification successful
Let me verify the MongoDB sharding configuration consistency by checking the values.yaml configuration against the actual implementation.
Sharding configuration is consistent across all components
The verification confirms that the sharding implementation is fully consistent:
- The shard key configuration in
values.yamlmatches the implementation ininit-mongos1.jswhere all collections (changes,snapshots,syncedseqs,versionvectors) usedoc_idas the shard key - The indexes in
indexes.gocorrectly definedoc_idas the shard key with the same configuration - The mongos replica count is consistently set to 1 and properly referenced across the configuration
- The sharding rules in
values.yamlalign with the actual sharding implementation in the MongoDB initialization scripts
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify consistency across files
# Check for any inconsistencies in configuration
# Look for any conflicting shard key definitions
rg -A 2 "doc_id.*shard|shard.*doc_id"
# Check for any existing version vector related tests
fd -e test.go -e spec.go -e _test.go --exec rg -l "versionvectors|VersionVectors"
Length of output: 3074
Script:
#!/bin/bash
# Check mongos replica count configuration
rg -A 2 "mongos.*ReplicaCount|replicaCount.*mongos" build/charts/yorkie-cluster/
# Check sharding configuration in values.yaml
cat build/charts/yorkie-cluster/charts/yorkie-mongodb/values.yaml
# Check for any other sharding related configurations
rg "sharding:|shards:|mongos:" build/charts/yorkie-cluster/
Length of output: 7038
design/mongodb-sharding.md (3)
3-3: LGTM: Version update is appropriate for sharding support.
The version bump to 0.5.7 aligns with the significant architectural changes introduced by sharding support.
162-167: LGTM: Well-defined cluster architecture.
The cluster architecture with 3 config servers, 3 shards (each with 3 replicas), and 2 mongos routers provides good redundancy and availability.
🧰 Tools
🪛 LanguageTool
[typographical] ~164-~164: Two consecutive commas
Context: ...eplica set): - shard1-1,shard1-2, shard1-3 - shard2-1,shard2-2, shard2-3 - shard3-1,`s...
(DOUBLE_PUNCTUATION)
[typographical] ~165-~165: Two consecutive commas
Context: ..., shard1-3 - shard2-1,shard2-2, shard2-3 - shard3-1,shard3-2, shard3-3 - 2 Mongos: `mong...
(DOUBLE_PUNCTUATION)
32-32: Verify versionvectors integration with existing collections.
The addition of versionvectors to document-wide relations and its unique constraint (doc_id, client_id) looks correct. However, we should verify that all existing queries and indexes support this new collection.
Also applies to: 51-51
✅ Verification successful
Let me search for version vector related patterns in the codebase to verify its integration. The previous search might have been too specific, so I'm broadening the search terms and file types.
Based on the search results, I can now provide a final response about the versionvectors integration:
Verified versionvectors collection integration is properly implemented
The versionvectors collection is well integrated into the system with:
- Proper MongoDB schema definition and sharding configuration in
build/docker/sharding/scripts/init-mongos1.js - Complete database client implementation in
server/backend/database/mongo/client.gowith CRUD operations - Consistent usage across the codebase for version control and garbage collection
- Proper indexing with
doc_idas shard key and unique constraint on(doc_id, client_id)
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for existing queries and indexes related to versionvectors
rg -A 5 "versionvectors\|ColVersionVectors" --type go
# Search for any potential conflicts with the new unique constraint
ast-grep --pattern 'collection($_, "versionvectors").$$$'
Length of output: 115
Script:
#!/bin/bash
# Search for versionvectors in MongoDB schema or collection definitions
rg -i "versionvectors" --type-add 'schema:*.{js,ts,go,java,py,rb}' --type schema -A 5
# Look for version vector related code patterns
rg -i "version.?vector" --type-add 'code:*.{js,ts,go,java,py,rb}' --type code -A 5
# Search for collection definitions or indexes
fd -e js -e ts -e go -e java -e py -e rb -x grep -l -i "collection.*versionvectors\|index.*versionvectors" {}
Length of output: 82687
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #1097 +/- ##
=======================================
Coverage 46.84% 46.84%
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Files 84 84
Lines 12256 12256
=======================================
Hits 5741 5741
Misses 5939 5939
Partials 576 576 ☔ View full report in Codecov by Sentry. |
hackerwins
changed the title
What this PR does / why we need it:
This PR adds the missing MongoDB sharding configuration for the version vectors collection introduced in PR #1047, as well as updates the related documentation to reflect these changes.
Which issue(s) this PR fixes:
Address #723
Special notes for your reviewer:
Does this PR introduce a user-facing change?:
Additional documentation:
Checklist:
Summary by CodeRabbit
New Features
versionvectorswith sharding capabilities in the MongoDB configuration.versionvectorscollection in the initialization script.Documentation
versionvectorscollection and its sharding strategy.Bug Fixes
Refactor
ColVersionVectorscollection to prioritize thedoc_idkey.