📢 Hello Fullstackers!
The comeback season is in full swing — first results are showing, and with them comes the most precious fuel for improvement: feedback. Whether it’s a sprint review, code review, or user feedback, each insight is a chance to grow stronger.
💡 “Feedback is the breakfast of champions.” — Ken Blanchard
In this edition, you’ll not only find practical tips on giving and receiving feedback/
Let’s take feedback as a compass — pointing us toward better teamwork, sharper code, and stronger projects. 🚀
#kafka
How to delete a Kafka topic immediately (no waiting)?
🛑 Stop Kafka, then run: rmr /brokers/topics/
⚙️ Set delete.topic.enable=true, then: kafka-topics --delete ...
🚫 Set delete.topic.enable=false, then: kafka-topics --delete ...
Answer: ✅ The closest to immediate is: Stop Kafka, then run rmr /brokers/topics/.
👉 kafka-topics --delete marks the topic for deletion, but logs may not be removed right away.
👉 Removing the ZooKeeper node (/brokers/topics/) forces deletion immediately.
Tip: This is a low-level, disruptive action—use with care in non-prod or during maintenance.
#team
Constructive feedback
🔸 CONSTRUCTIVE FEEDBACK: KEEP IT SHORT & USEFUL 💬
🔸 WHY IT MATTERS
▪️ Drives improvement, motivation, and productivity 🚀
🔸 HOW TO GIVE IT
▪️ Share only actionable value (something they can use) 🎯
▪️ Focus on specific behaviors, not the person 🔍
▪️ Be timely—give feedback close to the event ⏱️
▪️ Stay respectful; avoid labels or insults 🤝
▪️ Be open to feedback yourself 🔄
🔸 EXTRA TIPS
▪️ Use “I” statements (“I’m blocked when meetings start late”) 🗣️
▪️ End on a positive, forward-looking note ✅
▪️ Follow up to check progress and support 📈
🔸 TL;DR
▪️ Specific + timely + respectful + actionable = feedback that sticks 💡
#Leadership #Teamwork #Management #Feedback #SoftSkills #GrowthMindset #Productivity
#java
🔸 JDK MISSION CONTROL 9.1.0 — NEWBIE JVM BROWSER GUIDE 🚀
🔸 HOW TO START (30s SETUP) ⚙️
▪️ Launch JMC 9.1.0 → JVM Browser (top‑left).
▪️ Select your JVM → Right‑click to start JMX Console or Start Flight Recording….
▪️ Prefer Time‑fixed (profiling) for short deep dives; Continuous for long‑running apps.
▪️ Tweak JVM scan frequency in Preferences if you want faster discovery.
🔸 TOP 10 SPOTS IN THE JVM BROWSER 🔍
The most useful places a beginner should check first — with what to read and why it matters.
🔸 1) OVERVIEW (JMX CONSOLE) — YOUR COCKPIT 🧭
▪️ What to see: CPU %, Heap Used, Threads Live/Daemon, GC activity, quick charts.
▪️ Why: Fast sanity check after deploys; add/remove charts to track exactly what you care about.
▪️ Tip: Click Add chart ➜ drag attributes (e.g., java.lang:type= Memory/HeapMemoryUsage.used).
🔸 2) SYSTEM / RUNTIME — WHO AM I RUNNING? 🖥️
▪️ What to see: Java version, vendor, uptime, PID, command line, OS/arch, process memory (RSS), thread count.
▪️ Why: Confirms environment (JDK, flags) actually matches what prod/staging claims.
▪️ Tip: Screenshot this in incident reports to avoid “works on my machine”.
🔸 3) MEMORY (HEAP & METASPACE) — HEALTH CHECK 🧠
▪️ What to see: Heap used/max, pool breakdown (Young/Old), Metaspace usage, GC pause time trend.
▪️ Why: Detect leaks/pressure; rising Old Gen with frequent minor GCs is a red flag.
▪️ Tip: Watch Promotion rate and GC pauses together to spot allocation storms.
🔸 4) GC CONFIGURATION — WHICH COLLECTOR & THREADS ♻️
▪️ What to see: Collector type (G1/ZGC/Parallel), GC/conc. thread counts, pause targets.
▪️ Why: Mismatch between workload and collector = avoidable latency.
▪️ Tip: For latency‑sensitive services, verify you’re on G1/ZGC and check pause goals.
🔸 5) THREADS — LIVENESS & CONTENTION 🧵
▪️ What to see: Live/daemon counts, blocked/waiting threads, deadlock detector, stack traces.
▪️ Why: Spikes in blocked time point to locks, synchronized hotspots, or I/O stalls.
▪️ Tip: Sort by Blocked Time; capture stacks of the worst offenders.
🔸 6) CLASS LOADING — STARTUP & MEM FOOTPRINT 📚
▪️ What to see: Loaded/Unloaded classes, total count trend.
▪️ Why: Runaway class loading (dynamic proxies, hot reloading) drives Metaspace growth.
▪️ Tip: Flat line is good; steady climb during steady‑state hints at leaks.
🔸 7) MBEAN BROWSER — LIVE KNOBS & TELEMETRY 🎛️
▪️ What to see: java.lang:* (MemoryMXBean, ThreadMXBean), com.sun.management (HotSpot), app‑specific MBeans.
▪️ Why: Inspect attributes in real time; invoke operations safely (e.g., dump heap via HotSpotDiagnostic).
▪️ Tip: Pin attributes to charts; adjust update period for smoother visuals.
🔸 8) FLIGHT RECORDER (JFR) — TIME‑TRAVEL ANALYSIS 🎥
▪️ What to see: Start Profiling or Continuous recording; open .jfr to view Method profiling, Locks, GC, I/O, Allocations.
▪️ Why: Low‑overhead timeline of what actually happened during incidents.
▪️ Tip: Keep a continuous ring buffer in prod; dump on alert for post‑mortems.
🔸 9) DIAGNOSTIC COMMANDS — POWER TOOLS 🛠️
▪️ What to see: Under com.sun.management/DiagnosticCommand MBean, run Thread.print, GC.class_histogram, JFR.dump, etc.
▪️ Why: One‑click captures without SSHing into boxes.
▪️ Tip: Automate common commands and attach outputs to tickets.
🔸 10) JMC AGENT — ENRICH YOUR EVENTS 🧩
▪️ What to see: Agent Live Config under the JVM ➜ map app telemetry to custom JFR events without code changes.
▪️ Why: Add business/domain signals (tenant, orderId, endpoint) directly into recordings.
▪️ Tip: Keep configs versioned; treat them like code.
🔸 TL;DR 🧾
▪️ Start in Overview, confirm System/Runtime, then dive into Memory, Threads, GC Config.
▪️ Use MBean Browser for live knobs; use JFR for time‑travel proofs.
▪️ Diagnostic Commands = incident shortcuts; JMC Agent = richer events.
▪️ Always compare against a baseline.
#scrum
🔸 PRODUCT BACKLOG: NOT ONLY THE PO 📘
🔸 WHAT THE SCRUM GUIDE SAYS
▪️ “The Product Owner is responsible for the Product Backlog—content, availability, ordering.”
▪️ Refinement is collaborative: PO + Developers work together on item details.
🔸 KEY POINT
▪️ “Responsible” ≠ “does everything.” PO owns outcomes; the team collaborates to create/reorder for value.
🔸 WHY THE MYTH PERSISTS
▪️ PO with business-only mindset gatekeeps the backlog.
▪️ Rigid, rule-driven reading of Scrum instead of purpose-driven use.
🔸 BACK TO ESSENTIALS
▪️ Scrum reduces product risk through close collaboration, not hierarchy.
▪️ Developers can add/reorder items; PO remains accountable.
▪️ Scrum Master enables healthy collaboration.
🔸 PRACTICAL TIPS
▪️ Run product discovery workshops with the whole team.
▪️ In tools (e.g., Jira), allow Developers to edit/reorder; define team working agreements.
▪️ Scrum Masters coach on “why” (risk reduction) over dogma.
🔸 TL;DR
▪️ Collaboratively manage the backlog; PO is accountable, the team co-creates for maximum value. 🤝
#Scrum #ProductBacklog #Agile #ProductOwner #ScrumMaster #Developers #Collaboration
#cloudNative
Which project exposes services across clusters and supports multicluster discovery?
Pick one:
- SMI
- KubeFed
- Cluster API
- Submariner
✅ Correct Answer: 4. Submariner
💡 Why? Submariner connects clusters so services can reach each other and be discovered across clusters.
❌ Why the others are wrong:
- SMI → A spec for service meshes, not for cross-cluster exposure.
- KubeFed → Federates clusters, but not focused on multicluster service discovery.
- Cluster API → Manages cluster lifecycle, not service discovery.
#joke
My husband asked me why I speak so softly in the house.
I said I was afraid Mark Zuckerberg was listening.
He laughed.
I laughed.
Alexa laughed.😆
Siri laughed.😂
The Tesla next door laughed. 🤣
Go further with Java certification:
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