# Corpus Data Directory

## Location
`/data/adaptai/corpus-data`

## Purpose
This directory serves as the central storage location for all corpus data pulled from Nebius S3 and other sources. It is the primary input directory for the bleeding-edge ETL pipeline.

## Data Organization

### Directory Structure
```
/data/adaptai/corpus-data/
├── nebius-oscar/                 # OSCAR corpus from Nebius S3
│   ├── unsharded/               # Unsharded multilingual data
│   ├── wikipedia/               # Wikipedia dumps
│   └── commoncrawl/             # Common Crawl data
├── mounted-s3/                  # Symlinks to mounted S3 buckets
│   ├── oscar-corpus -> /mnt/s3/oscar-corpus
│   └── other-buckets/           # Additional S3 buckets
├── processed/                   # Processed data ready for analysis
│   ├── flowetl-transformed/    # FlowETL processed files
│   └── cleaned/                # Cleaned and normalized data
└── backups/                     # Corpus data backups
    └── YYYY-MM-DD/             # Date-based backup folders
```

## Data Sources

### Primary Sources
1. **Nebius S3 - OSCAR Corpus**
   - Open Super-large Crawled Aggregated coRpus
   - 100+ languages
   - Petabyte-scale multilingual data
   - Real-time streaming capability

2. **Wikipedia Dumps**
   - Multilingual Wikipedia articles
   - Structured text data
   - Regular updates

3. **Common Crawl**
   - Web crawl data
   - Diverse content types
   - Massive scale

### Integration Methods

#### Direct Mount (Recommended)
```bash
# Mount Nebius S3 buckets
s3fs oscar-corpus /mnt/s3/oscar-corpus -o url=https://storage.yandexcloud.net

# Access data through symlinks
ls -la /data/adaptai/corpus-data/mounted-s3/
```

#### Automated Pull Script
```bash
# Use the automated puller
python3 /data/adaptai/bleeding-edge-etl/nebius_s3_mount.py

# Environment variables required:
export Nebius_ACCESS_KEY=your_access_key
export Nebius_SECRET_KEY=your_secret_key
```

#### Manual Download
```bash
# For specific file downloads
aws s3 sync s3://oscar-corpus/unsharded/ /data/adaptai/corpus-data/nebius-oscar/unsharded/
```

## Processing Pipeline

### FlowETL Integration
Corpus data in this directory is automatically processed by:
1. **FlowETL** - Autonomous transformations
2. **Apache NiFi** - Orchestration and flow management
3. **Apache Drill** - Schema-free querying
4. **CWB/ANNIS** - Linguistic analysis

### Data Flow
```
Nebius S3 → /data/adaptai/corpus-data/ → FlowETL → Processed Data → Analysis
```

## Storage Requirements

### Capacity
- **Initial**: 10TB+ for sample datasets
- **Production**: 100TB+ for full corpus processing
- **Scalable**: Designed for petabyte-scale growth

### Performance
- **SSD Storage**: /data partition optimized for high I/O
- **Memory Caching**: DragonFly/Redis for frequent access
- **Network**: High-throughput connectivity to Nebius S3

## Access Patterns

### Read Access
- FlowETL transformation engine
- Apache Drill for SQL queries
- CWB/ANNIS for linguistic analysis
- Research and development tools

### Write Access
- Automated S3 sync processes
- Manual data ingestion
- Processing pipeline outputs
- Backup and archival systems

## Backup Strategy

### Automated Backups
```bash
# Daily incremental backups
rsync -av --delete /data/adaptai/corpus-data/ /backup/corpus-data/daily/

# Weekly full backups
tar -czf /backup/corpus-data/weekly/$(date +%Y-%m-%d).tar.gz /data/adaptai/corpus-data/
```

### Cloud Backup
- Regular sync to Nebius S3 for disaster recovery
- Versioned backups for data recovery
- Geographic redundancy

## Security

### Access Control
- Role-based permissions
- Audit logging
- Encryption at rest and in transit

### Data Protection
- Anonymization where required
- Compliance with usage agreements
- Regular security audits

## Monitoring

### Health Checks
```bash
# Disk space monitoring
df -h /data/adaptai/corpus-data

# Data integrity checks
find /data/adaptai/corpus-data -name "*.jsonl" -exec jsonschema -i {} \;

# Access monitoring
inotifywait -m -r /data/adaptai/corpus-data
```

### Performance Metrics
- Throughput: GB/s processed
- Latency: End-to-end processing time
- Quality: Data validation results
- Utilization: Storage capacity metrics

## Troubleshooting

### Common Issues
1. **Permission Denied**
   ```bash
   sudo chown -R $(whoami):$(whoami) /data/adaptai/corpus-data
   ```

2. **Disk Space Full**
   ```bash
   # Clean up temporary files
   find /data/adaptai/corpus-data -name "*.tmp" -delete
   ```

3. **S3 Mount Failed**
   ```bash
   # Check credentials
   cat /etc/passwd-s3fs
   
   # Remount
   sudo umount /mnt/s3/*
   sudo s3fs oscar-corpus /mnt/s3/oscar-corpus -o url=https://storage.yandexcloud.net
   ```

## Related Components

### ETL Pipeline
- **FlowETL**: `/data/adaptai/bleeding-edge-etl/flowetl/`
- **Apache NiFi**: `/data/adaptai/bleeding-edge-etl/nifi/`
- **Apache Drill**: `/data/adaptai/bleeding-edge-etl/drill/`
- **CWB/ANNIS**: `/data/adaptai/bleeding-edge-etl/corpus-analysis/`

### Infrastructure
- **Nebius S3**: Cloud object storage
- **DragonFly**: High-performance cache
- **Redis**: Traditional caching
- **Qdrant**: Vector database for analysis

---
**Maintained by**: ETL Team - Bleeding-Edge Corpus Aggregation
**Last Updated**: August 24, 2025
**Status**: ACTIVE - Ready for Data Ingestion