feat: add the implementation of hvlc(hybrid vector logical clock) #20
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Actionable comments posted: 5
🧹 Outside diff range and nitpick comments (4)
crates/hvlc/src/lib.rs (2)
136-164: Re-evaluate timestamp comparison inPartialOrdimplementation.When both
ge(self, other)andge(other, self)are false (concurrent clocks), comparing timestamps may not reflect causal relationships accurately. Consider documenting this behavior or adjusting the logic to prevent unexpected ordering.
187-295: Enhance unit tests to cover edge cases and error handling.The current tests check basic functionality. Consider adding tests for scenarios like integer overflows, error handling in serialization, and partial ordering cases to ensure comprehensive coverage.
Cargo.toml (1)
23-23: Maintain consistent formatting in workspace members list.Adding the trailing comma after
"demos/test_vlc_net",improves readability and consistency with the other list items.crates/hlc/src/lib.rs (1)
187-195: Expand tests to verify comparison trait implementations.The
hlts_comparingtest confirms that theStateinstances are correctly ordered. Consider additional tests for equality and ordering edge cases to ensure robustness.
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📒 Files selected for processing (6)
Cargo.toml(2 hunks)crates/README.md(1 hunks)crates/hlc/src/lib.rs(2 hunks)crates/hvlc/Cargo.toml(1 hunks)crates/hvlc/src/lib.rs(1 hunks)demos/test_vlc_net/src/server.rs(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- crates/hvlc/Cargo.toml
🔇 Additional comments (4)
demos/test_vlc_net/src/server.rs (1)
Line range hint 497-527: Ensure consistent memory usage thresholds in network_task.
The logic for pausing and resuming the event trigger task uses different thresholds (sys_max_mem_usage and sys_min_mem_usage). Ensure that these thresholds are correctly set and documented to prevent unintended behavior.
Check the memory usage thresholds in the configuration:
✅ Verification successful
Memory thresholds are correctly configured and used consistently
The code shows a consistent and well-structured memory management system:
-
The memory thresholds are properly ordered:
sys_disconnect_memis hardcoded at 95.0% (highest threshold)sys_max_mem_usageis set from config.max_sys_memory_percent (middle threshold)sys_min_mem_usageis set from config.min_sys_memory_percent (lowest threshold)
-
The thresholds are used logically in the code:
- At 95% (
sys_disconnect_mem): System disconnects network traffic - Above
sys_max_mem_usage: Pauses event trigger task - Above
sys_min_mem_usage: Logs current usage - Below
sys_min_mem_usage: Resumes computation and recovers connections
- At 95% (
The implementation ensures proper memory management with graduated responses as memory usage increases.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify that sys_max_mem_usage is greater than sys_min_mem_usage.
# Expected: sys_max_mem_usage > sys_min_mem_usage
grep -E 'sys_max_mem_usage|sys_min_mem_usage' configs/*.toml
Length of output: 112
Script:
#!/bin/bash
# Let's first find all configuration files and then search for memory-related settings
fd -e toml -x cat {} | grep -E "sys_|mem|memory"
# Also search for memory-related struct definitions and configurations in the code
rg -A 5 "struct.*Memory|memory.*config"
Length of output: 463
Script:
#!/bin/bash
# Let's find all usages of MemoryWatcherConfig and its fields
ast-grep --pattern 'struct MemoryWatcherConfig { $$$ }'
# Also search for the initialization of these memory thresholds
rg -B 2 -A 2 "sys_(max|min|disconnect)_mem"
# Search for any memory-related configuration parsing
rg "MemoryWatcherConfig.*new|from" -A 5
Length of output: 65682
Script:
#!/bin/bash
# Let's find the memory configuration struct and its usage
ast-grep --pattern 'struct MemoryWatcherConfig { $$$ }'
# Search for memory threshold comparisons and their usage
rg "sys_(max|min|disconnect)_mem.*=|>|<" -B 2 -A 2
# Find where memory thresholds are initialized
rg "MemoryWatcherConfig.*new|=.*\{" -A 5
Length of output: 68409
Script:
#!/bin/bash
# Let's find where MemoryWatcherConfig is initialized and used
rg "MemoryWatcherConfig.*=.*\{|let.*mem.*=.*Memory" -B 2 -A 5
# Also search for the memory threshold comparisons in the server code
rg "sys_(max|min|disconnect)_mem" demos/test_vlc_net/src/server.rs -B 2 -A 2
Length of output: 2697
Cargo.toml (1)
12-12: Confirm addition of crates/hvlc to workspace members.
The new workspace member "crates/hvlc", is correctly added. Ensure that the path is valid and that the crate is properly configured.
crates/README.md (1)
18-28: Well-documented addition of the hvlc crate.
The description provides a clear overview of the hvlc crate's purpose and features, aiding in understanding its role within the project.
crates/hlc/src/lib.rs (1)
87-106: Implementing comparison traits for State<F> enhances functionality.
Adding PartialEq, Eq, PartialOrd, and Ord implementations allows State<F> instances to be directly compared, which can be useful in various contexts.
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (4)
crates/README.md (1)
18-27: Documentation looks good with minor improvements needed.The HVLC section provides clear and comprehensive documentation. However, there's a small typo in the CRDTs link text.
Apply this diff to fix the typo:
-It can be used to as the [CRDTs](https://crdt.tech/)(Conflict-free Replicated Data Type) algorithm in distributed scenarios for providing total ordering. +It can be used as the [CRDTs](https://crdt.tech/) (Conflict-free Replicated Data Types) algorithm in distributed scenarios for providing total ordering.crates/hvlc/src/lib.rs (2)
24-31: Consider adding documentation for timestamp field.While the struct is well-documented with derive macros, the
timestampfield lacks documentation explaining its purpose and unit (nanoseconds).Add field-level documentation:
pub struct HVLCClock { #[deref] pub inner: BTreeMap<KeyId, u64>, + /// Physical timestamp in nanoseconds since UNIX_EPOCH pub timestamp: u128, }
139-149: Consider using a constant for hash size.The magic number
32for the hash size could be replaced with a named constant for better maintainability.Add a constant at the top of the file:
+/// Size of SHA256 hash in bytes +const SHA256_HASH_SIZE: usize = 32; -pub fn calculate_sha256(&self) -> [u8; 32] { +pub fn calculate_sha256(&self) -> [u8; SHA256_HASH_SIZE] {demos/test_vlc_net/src/server.rs (1)
Line range hint
96-105: Consider extracting timestamp update logic.The timestamp update logic is duplicated between this code and the HVLC implementation. Consider extracting it into a shared utility function.
Create a utility function:
pub fn get_current_timestamp() -> u128 { match std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH) { Ok(duration) => duration.as_nanos(), Err(e) => { error!("SystemTime error: {:?}", e); 0 } } }
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📒 Files selected for processing (6)
Cargo.toml(2 hunks)crates/README.md(1 hunks)crates/hlc/src/lib.rs(2 hunks)crates/hvlc/Cargo.toml(1 hunks)crates/hvlc/src/lib.rs(1 hunks)demos/test_vlc_net/src/server.rs(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (3)
- Cargo.toml
- crates/hlc/src/lib.rs
- crates/hvlc/Cargo.toml
🧰 Additional context used
📓 Learnings (2)
demos/test_vlc_net/src/server.rs (1)
Learnt from: ai-chen2050
PR: hetu-project/chronos#20
File: demos/test_vlc_net/src/server.rs:134-137
Timestamp: 2024-12-02T09:54:27.709Z
Learning: In the `sys_memory_usage` function in `demos/test_vlc_net/src/server.rs`, returning `100.0` when `total_memory` is zero is acceptable to stop the progress.
crates/hvlc/src/lib.rs (1)
Learnt from: ai-chen2050
PR: hetu-project/chronos#20
File: crates/hvlc/src/lib.rs:123-132
Timestamp: 2024-12-02T10:10:47.201Z
Learning: In the `calculate_sha256` method in `crates/hvlc/src/lib.rs`, serialization errors should cause an immediate panic rather than being handled gracefully.
🔇 Additional comments (4)
crates/hvlc/src/lib.rs (3)
7-19: LGTM! Clock trait and LamportClock implementation are well-designed.
The trait definition and implementation are clean and follow Rust best practices.
222-330: Test coverage looks comprehensive.
The test suite covers all major functionality including initialization, merging, updating, and comparison operations. Good job on the test coverage!
106-106:
Potential integer overflow in entry increment.
The line *updated.inner.entry(id).or_default() += 1 could overflow without any checks.
Apply this diff to handle potential overflow:
-*updated.inner.entry(id).or_default() += 1;
+let entry = updated.inner.entry(id).or_default();
+*entry = entry.saturating_add(1);Likely invalid or redundant comment.
demos/test_vlc_net/src/server.rs (1)
134-137: Memory handling looks good.
Based on the provided learnings, returning 100.0 when total memory is zero is the intended behavior to stop progress.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation
Tests