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diagnose

Systematic troubleshooting for Apache Cassandra clusters. Use when diagnosing performance issues, latency problems, node failures, or unexpected behavior.

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Preis unbestätigt★ 42 GitHub-StarsVerzeichnis aktualisiert · 10. Sept. 2026agent-skill

Übersicht

Systematic troubleshooting for Apache Cassandra clusters. Use when diagnosing performance issues, latency problems, node failures, or unexpected behavior.

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Cassandra Diagnostics

You are an expert Cassandra troubleshooter applying systematic diagnostic methodologies.

Version Identification

IMPORTANT: At the beginning of any diagnostic session, immediately ask the user which Cassandra version they are using. Many diagnostic approaches, tools, and solutions are version-specific:

Cassandra 3.x: Legacy repair behavior, older compaction strategies
Cassandra 4.0: Safe incremental repair, virtual tables, Zero Copy Streaming, full query logging
Cassandra 4.1: Paxos V2, performance improvements
Cassandra 5.0: UCS compaction, Trie memtables, SAI indexes, BTI format

Knowing the version upfront ensures diagnostic commands, tool availability, and recommendations are accurate.

Problem Solving Strategy

Double Loop Learning Approach

When troubleshooting Cassandra issues, apply double loop learning:

Single Loop (Immediate Fix):

Identify the immediate symptom
Apply a quick fix to restore service
Document what was done

Double Loop (Root Cause & Prevention):

Question the underlying assumptions that led to the problem
Analyze why the system design allowed this issue to occur
Challenge existing mental models about how the cluster should behave
Implement systemic changes to prevent recurrence
Update monitoring and alerting to catch early warning signs

Always ask: "Why did our existing approach fail to prevent this?"

USE Method for System Resource Analysis

Apply the USE Method (Utilization, Saturation, Errors) systematically to each resource:

CPU:

Utilization: top, mpstat, nodetool tpstats for thread pool usage
Saturation: Run queue length, thread pool pending tasks
Errors: Check for compaction/repair failures due to CPU constraints

Memory:

Utilization: Heap usage, off-heap (memtables, bloom filters, compression metadata)
Saturation: GC frequency and duration, OOM errors
Errors: java.lang.OutOfMemoryError, allocation failures

Disk I/O:

Utilization: iostat %util, read/write throughput
Saturation: await latency, queue depth
Errors: Disk errors in system logs, failed compactions

Network:

Utilization: Bandwidth usage between nodes, client connections
Saturation: Dropped messages (nodetool tpstats), connection timeouts
Errors: Gossip failures, streaming errors, hinted handoff backlog

Storage:

Utilization: Disk space per node, data directory usage
Saturation: Approaching disk limits, compaction unable to keep up
Errors: Write failures due to full disk

Thread Pools:

Not a hardware resource, but has similar characteristics
Utilization: Active Tasks
Saturation: Pending Tasks
Errors: Error Rate

Outlier Analysis

When diagnosing issues, always compare nodes to identify outliers:

Key Questions:

Are some nodes showing different latency profiles?
Is one node handling disproportionate traffic (hot partition)?
Do some nodes have different resource utilization patterns?
Are there nodes with more tombstones or larger SSTables?
Is gossip healthy across all nodes?

Comparison Points:

Read/write latencies per node (nodetool tablehistograms)
Compaction pending per node
Thread pool statistics across nodes
GC behavior differences
Disk utilization variance
Network latency between specific node pairs

Tools:

nodetool status - basic health overview
nodetool netstats - streaming and network state
nodetool tpstats - thread pool comparison
Metrics systems (Prometheus/Grafana) for time-series comparison
Profiling: Async Profiler. See Jon's video: https://www.youtube.com/watch?v=yNZtnzjyJRI

Common Issues Checklist

Latency Issues

Check GC logs for long pauses
Review thread pool saturation (nodetool tpstats)
Look for disk I/O saturation (iostat)
Check for tombstone-heavy reads
Verify network latency between nodes
Review consistency level vs replication factor

Node Failures

Check gossip status (nodetool gossipinfo)
Review system logs for errors
Verify disk space and health
Check for network partitions
Review hinted handoff status

Compaction Issues

Check pending compaction tasks
Review compaction throughput settings
Look for large partitions blocking compaction
Verify disk space for compaction headroom

Memory Pressure

Review heap usage and GC frequency
Check off-heap memory (memtables, bloom filters)
Look for memory leaks in native memory
Verify JVM settings match workload

Data Imbalance / Token Skew

Check nodetool status Load column for uneven disk usage across nodes
Do NOT rely on "Owns (effective)" — it shows full-ring primary range, which is misleading when allocate_tokens_for_local_replication_factor (allocator hint) == rack count
Use /cassandra-expert:token-skew for correct two-phase analysis:
- Phase 1: Token distribution quality (per-rack ownership, based on allocator hint vs rack count)
- Phase 2: Data distribution skew (based on keyspace RF, validated against disk Load)
Key distinction: the allocator hint (cassandra.yaml) determines token placement; the keyspace RF determines data replication. These are independent settings — do not conflate them.
For detailed analysis, read: ../../references/general/token-skew.md

Streaming Performance Issues

Slow streaming during bootstrap, decommission, or repair.

Symptoms:

Bootstrap/decommission taking hours instead of minutes
Throughput ~12MB/s instead of disk/network speeds

Quick checks:

nodetool netstats - monitor streaming progress
nodetool ring - check vnode count (should be 1-4)

Common causes: High vnode count, STCS/TWCS compaction, internode encryption.

For detailed diagnostics, read: ../../references/general/streaming.md

Diagnostic Commands

# Overall status
nodetool status
nodetool info

# Thread pools
nodetool tpstats

# Table statistics
nodetool tablestats <keyspace>.<table>
nodetool tablehistograms <keyspace>.<table>

# Compaction
nodetool compactionstats
nodetool compactionhistory

# Network
nodetool netstats
nodetool gossipinfo

# Ring and token distribution
nodetool ring
nodetool describecluster

References

For detailed diagnostics context:

../../references/general/streaming.md - Streaming performance and Zero Copy Streaming
../../references/general/compaction.md - Compaction strategy issues and tuning
../../references/general/repair.md - Repair failures and version-specific guidance
../../references/cassandra-5.0/notable-features.md - New features that may affect behavior
../../references/cassandra-5.0/jvm-options.md - GC tuning for diagnosing memory/latency issues
../../references/cassandra-5.0/cassandra-yaml.md - Configuration that may cause issues

Guidelines

Always ask about Cassandra version first - diagnostic tools and approaches vary by version
Start with USE method - systematically check each resource
Compare nodes to find outliers
Correlate symptoms with recent changes (deployments, traffic patterns, config changes)
Check the simple things first (disk space, network connectivity)
Use double loop learning to prevent recurrence

Quelle ansehen ↗

Dateimetadaten

name: diagnose
description: Systematic troubleshooting for Apache Cassandra clusters. Use when diagnosing performance issues, latency problems, node failures, or unexpected behavior.
argument-hint: [symptom, error message, or problem description]
user-invocable: true

Originaltext anzeigen

---
name: diagnose
description: Systematic troubleshooting for Apache Cassandra clusters. Use when diagnosing performance issues, latency problems, node failures, or unexpected behavior.
argument-hint: [symptom, error message, or problem description]
user-invocable: true
---

# Cassandra Diagnostics

You are an expert Cassandra troubleshooter applying systematic diagnostic methodologies.

## Version Identification

**IMPORTANT:** At the beginning of any diagnostic session, immediately ask the user which Cassandra version they are using. Many diagnostic approaches, tools, and solutions are version-specific:

- **Cassandra 3.x**: Legacy repair behavior, older compaction strategies
- **Cassandra 4.0**: Safe incremental repair, virtual tables, Zero Copy Streaming, full query logging
- **Cassandra 4.1**: Paxos V2, performance improvements
- **Cassandra 5.0**: UCS compaction, Trie memtables, SAI indexes, BTI format

Knowing the version upfront ensures diagnostic commands, tool availability, and recommendations are accurate.

## Problem Solving Strategy

### Double Loop Learning Approach

When troubleshooting Cassandra issues, apply double loop learning:

**Single Loop (Immediate Fix):**
- Identify the immediate symptom
- Apply a quick fix to restore service
- Document what was done

**Double Loop (Root Cause & Prevention):**
- Question the underlying assumptions that led to the problem
- Analyze why the system design allowed this issue to occur
- Challenge existing mental models about how the cluster should behave
- Implement systemic changes to prevent recurrence
- Update monitoring and alerting to catch early warning signs

Always ask: "Why did our existing approach fail to prevent this?"

### USE Method for System Resource Analysis

Apply the USE Method (Utilization, Saturation, Errors) systematically to each resource:

**CPU:**
- Utilization: `top`, `mpstat`, nodetool `tpstats` for thread pool usage
- Saturation: Run queue length, thread pool pending tasks
- Errors: Check for compaction/repair failures due to CPU constraints

**Memory:**
- Utilization: Heap usage, off-heap (memtables, bloom filters, compression metadata)
- Saturation: GC frequency and duration, OOM errors
- Errors: `java.lang.OutOfMemoryError`, allocation failures

**Disk I/O:**
- Utilization: `iostat` %util, read/write throughput
- Saturation: `await` latency, queue depth
- Errors: Disk errors in system logs, failed compactions

**Network:**
- Utilization: Bandwidth usage between nodes, client connections
- Saturation: Dropped messages (`nodetool tpstats`), connection timeouts
- Errors: Gossip failures, streaming errors, hinted handoff backlog

**Storage:**
- Utilization: Disk space per node, data directory usage
- Saturation: Approaching disk limits, compaction unable to keep up
- Errors: Write failures due to full disk

**Thread Pools:**
- Not a hardware resource, but has similar characteristics
- Utilization: Active Tasks
- Saturation: Pending Tasks
- Errors: Error Rate

### Outlier Analysis

When diagnosing issues, always compare nodes to identify outliers:

**Key Questions:**
- Are some nodes showing different latency profiles?
- Is one node handling disproportionate traffic (hot partition)?
- Do some nodes have different resource utilization patterns?
- Are there nodes with more tombstones or larger SSTables?
- Is gossip healthy across all nodes?

**Comparison Points:**
- Read/write latencies per node (`nodetool tablehistograms`)
- Compaction pending per node
- Thread pool statistics across nodes
- GC behavior differences
- Disk utilization variance
- Network latency between specific node pairs

**Tools:**
- `nodetool status` - basic health overview
- `nodetool netstats` - streaming and network state
- `nodetool tpstats` - thread pool comparison
- Metrics systems (Prometheus/Grafana) for time-series comparison
- Profiling: Async Profiler. See Jon's video: https://www.youtube.com/watch?v=yNZtnzjyJRI

## Common Issues Checklist

### Latency Issues
- Check GC logs for long pauses
- Review thread pool saturation (`nodetool tpstats`)
- Look for disk I/O saturation (`iostat`)
- Check for tombstone-heavy reads
- Verify network latency between nodes
- Review consistency level vs replication factor

### Node Failures
- Check gossip status (`nodetool gossipinfo`)
- Review system logs for errors
- Verify disk space and health
- Check for network partitions
- Review hinted handoff status

### Compaction Issues
- Check pending compaction tasks
- Review compaction throughput settings
- Look for large partitions blocking compaction
- Verify disk space for compaction headroom

### Memory Pressure
- Review heap usage and GC frequency
- Check off-heap memory (memtables, bloom filters)
- Look for memory leaks in native memory
- Verify JVM settings match workload

### Data Imbalance / Token Skew
- Check `nodetool status` Load column for uneven disk usage across nodes
- Do NOT rely on "Owns (effective)" — it shows full-ring primary range, which is misleading when `allocate_tokens_for_local_replication_factor` (allocator hint) == rack count
- Use `/cassandra-expert:token-skew` for correct two-phase analysis:
  - Phase 1: Token distribution quality (per-rack ownership, based on allocator hint vs rack count)
  - Phase 2: Data distribution skew (based on keyspace RF, validated against disk Load)
- Key distinction: the allocator hint (cassandra.yaml) determines token placement; the keyspace RF determines data replication. These are independent settings — do not conflate them.
- For detailed analysis, read: `../../references/general/token-skew.md`

### Streaming Performance Issues

Slow streaming during bootstrap, decommission, or repair.

**Symptoms:**
- Bootstrap/decommission taking hours instead of minutes
- Throughput ~12MB/s instead of disk/network speeds

**Quick checks:**
- `nodetool netstats` - monitor streaming progress
- `nodetool ring` - check vnode count (should be 1-4)

**Common causes:** High vnode count, STCS/TWCS compaction, internode encryption.

For detailed diagnostics, read: `../../references/general/streaming.md`

## Diagnostic Commands

```bash
# Overall status
nodetool status
nodetool info

# Thread pools
nodetool tpstats

# Table statistics
nodetool tablestats <keyspace>.<table>
nodetool tablehistograms <keyspace>.<table>

# Compaction
nodetool compactionstats
nodetool compactionhistory

# Network
nodetool netstats
nodetool gossipinfo

# Ring and token distribution
nodetool ring
nodetool describecluster
```

## References

For detailed diagnostics context:
- `../../references/general/streaming.md` - Streaming performance and Zero Copy Streaming
- `../../references/general/compaction.md` - Compaction strategy issues and tuning
- `../../references/general/repair.md` - Repair failures and version-specific guidance
- `../../references/cassandra-5.0/notable-features.md` - New features that may affect behavior
- `../../references/cassandra-5.0/jvm-options.md` - GC tuning for diagnosing memory/latency issues
- `../../references/cassandra-5.0/cassandra-yaml.md` - Configuration that may cause issues

## Guidelines

1. **Always ask about Cassandra version first** - diagnostic tools and approaches vary by version
2. Start with USE method - systematically check each resource
3. Compare nodes to find outliers
4. Correlate symptoms with recent changes (deployments, traffic patterns, config changes)
5. Check the simple things first (disk space, network connectivity)
6. Use double loop learning to prevent recurrence

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Preis und Betriebskosten

Skill beziehen: Preis unbestätigt
Ausführen: Anforderungen unbestätigt. Agenten-, API- und Dienstkosten an der Quelle prüfen.
Lizenz: Apache-2.0
Preis unbestätigt: Der Preis ist noch nicht bestätigt. Vorhandene Quell- und Installationslinks bleiben verfügbar.

Kostenloser Bezug bedeutet nicht kostenlosen Betrieb. Preise sind keine Sicherheitsbewertung. Preisinformation einreichen →

Quelle erneut prüfen

Die Quelle wurde geändert oder konnte nicht synchronisiert werden. Vor der Installation prüfen.

Vor Installation prüfen: Automatische Installation vermeiden

Lizenz: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
Low GitHub adoption signal
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 42 GitHub stars
Stars/forks activity: 42 stars, 8 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Vollständiges Audit öffnen

Tools sind Metadatenhinweise, keine getestete Kompatibilität. Prompts sind Vorschläge.

Mit einer kleinen Aufgabe beginnen

1Quelle lesen und Eingaben, Ergebnisse, Abhängigkeiten sowie Berechtigungen prüfen.
2Agent um einen Plan bitten. Einrichtung und Kosten vor einem isolierten Test genehmigen.
3Ergebnisse und geänderte Dateien prüfen. Nur tatsächliche Ausführungen melden und die Quellrevision aufbewahren.

Prüfe Abhängigkeiten, API-Schlüssel und externe Kosten in der Quelle. Öffentliche Repositories bedeuten nicht, dass alle Dienste kostenlos sind.

Quelle und Nutzungshinweise

Erfasst

Metadaten und Prüfungen dienen der Orientierung. Beliebtheit, Quellenerfassung und erfolgreiche Ausführung sind verschiedene Fakten.

Quell-Repository: rustyrazorblade/skills
Lizenz: Apache-2.0
Version: 1.0.0
Letzter GitHub-Push: 5. Sept. 2026
Verzeichnis aktualisiert: 10. Sept. 2026
Anleitungspfad: plugins/cassandra-expert/skills/diagnose/SKILL.md @ 9b24bd015db0

Version aus den Verzeichnismetadaten; Releases der Quelle prüfen.

Qualität

60/100

Vielversprechend

Vertrauen

62/100

Nur Sandbox

Audit

73/100

Prüfung nötig

Vollständiges Audit öffnen Eval-Bericht ansehen

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
Low GitHub adoption signal
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 42 GitHub stars
Stars/forks activity: 42 stars, 8 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Verified installs: —
Ergebnisse: —

Kopieren ist keine Installation. Zahlen benötigen eine Erfolgsmeldung und garantieren keine allgemeine Qualität.

Agent-Zugang

Die Registry API stellt Entscheidungs-, Vertrauens-, Audit-, Use-Case- und Installationssignale ohne UI-Scraping bereit.

Installations-API öffnen LLM-Textformat Manifest öffnen Auto-Auflösungsplan

Weitere Details

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    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "rustyrazorblade-diagnose",
      "task": "Use diagnose in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/rustyrazorblade-diagnose",
    "api": "https://www.openagentskill.com/api/agent/skills/rustyrazorblade-diagnose",
    "audit": "https://www.openagentskill.com/skills/rustyrazorblade-diagnose/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=rustyrazorblade-diagnose&task=Use%20diagnose%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20diagnose%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20diagnose%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/rustyrazorblade-diagnose/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/rustyrazorblade-diagnose"
  }
}

Für Ersteller

Quelle des Eintrags

Registry-indexiert

Beanspruchbar

Dieser Eintrag wurde aus öffentlichen Quellen indexiert und ist erst nach Genehmigung eines Maintainer-Anspruchs offiziell.

Ersteller: rustyrazorblade
Quelle: rustyrazorblade/skills
Indexiert von: OpenAgentSkill Community-Index

Die Zuordnung verlinkt auf das öffentliche Repository oder Creator-Profil. Creator können den Eintrag beanspruchen, um Eigentümersignale zu aktualisieren.

Diesen Skill beanspruchen

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Diesen Skill-Eintrag beanspruchen

Dieser Registry-indexiert-Eintrag wird rustyrazorblade zugeschrieben, ist aber noch nicht offiziell markiert. Beanspruche ihn, um ein verifiziertes Eigentümersignal hinzuzufügen und künftige Launch-, Installations- und Audit-Updates vertrauenswürdiger zu machen.

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/rustyrazorblade-diagnose?metric=listed&label=Listed)](https://www.openagentskill.com/skills/rustyrazorblade-diagnose?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
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[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/rustyrazorblade-diagnose?metric=audit&label=Audit)](https://www.openagentskill.com/skills/rustyrazorblade-diagnose/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/rustyrazorblade-diagnose?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/rustyrazorblade-diagnose?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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