SliceSight-Next

Advanced Redis hotspot detection and analysis tool for identifying load imbalances in Redis clusters.

Features

• Real-time hotspot detection using multiple statistical metrics
• Adaptive thresholding that adjusts based on cluster size and key distribution
• Comprehensive analysis with load ratios, coefficient of variation, and Gini coefficients
• CLI interface for simulation, scanning, and scoring
• High performance with optimized algorithms for large-scale deployments

Installation

pip install slicesight-next

Quick Start

Command Line Usage

# Simulate key distribution
slicesight-hotshard simulate --keys 1000 --buckets 3 --auto-thresh

# Score existing load distribution
slicesight-hotshard score 100.0 200.0 150.0 --auto-thresh

# Check system health
slicesight-hotshard health

Python API

from slicesight_next import (
    redis_cluster_slot,
    load_ratio,
    calc_cv,
    calc_gini,
    auto_ratio_thresh,
    verdict
)

# Calculate Redis cluster slot
key = "user:12345"
slot = redis_cluster_slot(key)
print(f"Key '{key}' maps to slot {slot}")

# Analyze load distribution
loads = [100.0, 200.0, 150.0]
ratio = load_ratio(loads)
cv = calc_cv(loads)
gini = calc_gini(loads)

print(f"Load ratio: {ratio:.2f}")
print(f"Coefficient of variation: {cv:.2f}")
print(f"Gini coefficient: {gini:.2f}")

# Use adaptive threshold
n_keys = 1000
n_buckets = 3
threshold = auto_ratio_thresh(n_keys, n_buckets)
print(f"Adaptive threshold: {threshold:.3f}")

# Generate hotspot verdict
result = verdict(ratio, cv, gini, 0.1, threshold, 0.05)
print(f"Hotspot detected: {result['hotspot_detected']}")

Adaptive Threshold Formula

The adaptive threshold automatically adjusts based on your cluster configuration:

ρ_auto(n,k) = 1 / (1 + 3√((k−1)/n))

Where:

• n = number of keys
• k = number of buckets/nodes

This formula ensures that:

• Small clusters get higher thresholds (more tolerance for imbalance)
• Large clusters get lower thresholds (expect better distribution)
• More keys result in lower thresholds (better distribution expected)

CLI Commands

simulate

Simulate Redis key distribution and detect hotspots:

slicesight-hotshard simulate [OPTIONS]

Options:
  --keys INTEGER          Number of keys to simulate [default: 1000]
  --buckets INTEGER       Number of buckets/nodes [default: 3]
  --ratio-thresh FLOAT    Load ratio threshold
  --auto-thresh          Use adaptive threshold
  --p-thresh FLOAT       P-value threshold [default: 0.05]
  --json                 Output in JSON format
  --seed INTEGER         Random seed for reproducibility

score

Score given load distribution:

slicesight-hotshard score LOADS... [OPTIONS]

Arguments:
  LOADS...  Load values for each node

Options:
  --buckets INTEGER       Number of buckets
  --ratio-thresh FLOAT    Load ratio threshold
  --auto-thresh          Use adaptive threshold
  --p-thresh FLOAT       P-value threshold [default: 0.05]
  --json                 Output in JSON format

scan

Scan Redis instance (future implementation):

slicesight-hotshard scan [OPTIONS]

Options:
  --host TEXT            Redis host [default: localhost]
  --port INTEGER         Redis port [default: 6379]
  --buckets INTEGER      Number of buckets/nodes [default: 3]
  --auto-thresh         Use adaptive threshold
  --json               Output in JSON format

Metrics Explained

Load Ratio

The ratio between the highest and lowest loaded nodes:

• 1.0 = Perfect balance
• >2.0 = Potential hotspot concern
• >5.0 = Significant imbalance

Coefficient of Variation (CV)

Measures relative variability in the distribution:

• 0.0 = No variation (perfect balance)
• >1.0 = High variability, potential hotspots

Gini Coefficient

Measures inequality in load distribution:

• 0.0 = Perfect equality
• >0.5 = Significant inequality
• 1.0 = Maximum inequality

Chi-square P-value

Tests if distribution differs significantly from uniform:

• >0.05 = Distribution appears uniform
• <0.05 = Significant deviation from uniform

Development

Setup

git clone https://github.com/slicesight/slicesight-next.git
cd slicesight-next
pip install -e ".[dev,test]"

Testing

# Run all tests
pytest

# Run with coverage
pytest --cov=slicesight_next --cov-report=html

# Run performance benchmarks
pytest tests/performance/ -v

# Run property-based tests
pytest tests/property/ -v

Code Quality

# Format and lint
ruff check .
ruff format .

# Type checking
mypy slicesight_next --strict

# Security scan
bandit -r slicesight_next

Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Performance

SliceSight-Next is optimized for production use:

• CRC16 calculation: >100k ops/sec
• Slot distribution: >50k keys/sec
• Metrics calculation: >10k distributions/sec
• Memory efficient: O(1) space complexity for most operations

Use Cases

• Redis Cluster Monitoring: Detect hotspots in production clusters
• Load Testing: Analyze key distribution in test scenarios
• Capacity Planning: Model cluster behavior under different loads
• Performance Tuning: Identify and resolve load imbalances

💬 Feedback & Support

We'd love to hear from you! SliceSight-Next is actively seeking user feedback to improve.

Quick Feedback

# Submit feedback directly via CLI
slicesight-hotshard feedback "Your thoughts here"
slicesight-hotshard feedback "Found a bug" --category bug --email you@company.com

Community & Support

• 🐛 Report Issues
• 💬 Join Discussions
• 📖 Documentation
• ⭐ Star us on GitHub if you find this useful!

What We're Looking For

• Real-world Redis key patterns you're testing
• Performance feedback on large datasets
• Feature requests for better Redis monitoring
• Use cases we haven't considered
• Integration pain points