ITSupportWale

Benchmarking Java 21: Virtual Threads Latency Deep Dive

November 14, 2026 by Techie

Post-Mortem: Socket Exhauster on Node 04 java.lang.OutOfMemoryError: Thread creation failed: Operating system resource exhausted at java.base/java.lang.Thread.start(Thread.java:1539) at java.base/java.lang.VirtualThread.start(VirtualThread.java:307) at com.fintech.ledger.io.SocketWorkerPool.dispatch(SocketWorkerPool.java:88) at com.fintech.ledger.GatewayServer.lambda$acceptConnections$3(GatewayServer.java:142) at java.base/jdk.internal.vm.Continuation.enter(Continuation.java:340) … Caused by: java.io.UncheckedIOException: java.net.SocketException: Too many open files at com.fintech.ledger.io.NativeEpollDispatcher.register(NativeEpollDispatcher.java:211) It pinned. Hard. After three days of staring at raw kernel-bypass logs on Node 04, watching p99.9 latencies blow past … Read more

PostgreSQL 17 Logical: Failover Slots & Conflicts

November 13, 2026 by Techie

Sweat dripping onto the mechanical keyboard. Pager blaring at 03:42 UTC. The SRE channel melting down with all-caps panic. That was the moment `ledger_db_prod_us-east-1` effectively committed suicide. We watched in absolute horror as the primary node flatlined due to an abrupt storage array partition. Autonomous failover scripts executed precisely as engineered. They promoted `pg17-primary-core.data.corp:5433` to … Read more

ebpfbased distributed tracing in Envoy: Fix Leaks & Overhead

November 13, 2026 by Techie

The 03:14 AM OOM Sweep [Wed Oct 18 03:14:02 2023] oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=900 [Wed Oct 18 03:14:02 2023] CPU: 37 PID: 14892 Comm: envoy Kdump: nullptr Tainted: G OE 5.15.0-88-generic #98-Ubuntu [Wed Oct 18 03:14:02 2023] Mem-Total: 32901416kB, AnonPages: 29841904kB, Shmem: 11232kB, Slab: 412091kB [Wed Oct 18 03:14:02 2023] Active(anonymous): 18402912 Inactive: 11419024 Isolated:₀ … Read more

React Native: Build High-Performance Mobile Apps in 2024

November 6, 2026 by Techie

The modern mobile application is a crime scene, and the suspects are web developers who think a 120Hz ProMotion display is just a faster way to scroll through a div-soup of unoptimized DOM nodes. For fifteen years, I sat in the trenches of Xcode and Android Studio, manually managing memory cycles, fighting the LLVM compiler, … Read more

Azure DevOps: The Ultimate Guide to Streamline Your Workflow

November 5, 2026 by Techie

It’s 3:14 AM. The production hotfix just failed because a self-hosted agent ran out of disk space on its C: drive, and the cleanup script I wrote three months ago was silently killed by a Group Policy update no one told me about. If you’re reading this, you’re my replacement. I’m gone. I’ve traded my … Read more

What is JavaScript? A Complete Guide for Beginners

November 4, 2026 by Techie

node:internal/modules/cjs/loader:1147 throw err; ^ Error: Cannot find module ‘left-pad’ Require stack: – /opt/legacy-app/dist/server/index.js at Module._resolveFilename (node:internal/modules/cjs/loader:1144:15) at Module._load (node:internal/modules/cjs/loader:985:27) at Module.require (node:internal/modules/cjs/loader:1235:19) at require (node:internal/modules/helpers:176:18) at Object. (/opt/legacy-app/dist/server/index.js:42:18) at Module._compile (node:internal/modules/cjs/loader:1356:14) at Module._extensions..js (node:internal/modules/cjs/loader:1414:10) at Module.load (node:internal/modules/cjs/loader:1208:32) at Module._load (node:internal/modules/cjs/loader:1024:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:135:11) { code: ‘MODULE_NOT_FOUND’, requireStack: [ ‘/opt/legacy-app/dist/server/index.js’ ] } [3:14 AM] … Read more

What is Kubernetes? The Ultimate Guide to K8s Orchestration

November 3, 2026 by Techie

text Mar 14 03:14:02 node-prod-042 kubelet[1402]: E0314 03:14:02.124 node_container_manager_linux.go:612] “Failed to update control group” err=”failed to set config for cgroup v2: write /sys/fs/cgroup/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod823.slice/memory.max: invalid argument” Mar 14 03:14:05 node-prod-042 kubelet[1402]: I0314 03:14:05.441 status_manager.go:614] “Patch status for pod failed” pod=”default/api-gateway-7f8d9b” err=”rpc error: code = Unavailable desc = keepalive ping failed” Mar 14 03:14:08 control-plane-01 kube-apiserver[821]: E0314 … Read more

Machine Learning Engineer: The Ultimate Career Guide

November 1, 2026 by Techie

text [ 4829.102394] NVRM: GPU at PCI:0000:41:00: GPU-8d2f1a3b-5c6e-7d8f-9a0b-1c2d3e4f5a6b [ 4829.102398] NVRM: Xid (PCI:0000:41:00): 31, Ch 00000018, recovery procedure: 1 [ 4829.102401] NVRM: Xid (PCI:0000:41:00): 79, GPU has fallen off the bus. [ 4829.102405] NVRM: Error: GPU at 0000:41:00.0 has fallen off the bus. [ 4829.102410] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 … Read more

Mastering Your Kubernetes Cluster: A Step-by-Step Guide

October 31, 2026 by Techie

It was 3:14 AM on a Tuesday when the first 503 errors started hitting the ingress-nginx logs, and by 3:20, the entire kubernetes cluster was a graveyard of CrashLoopBackOffs. I’m writing this because if I don’t document this nightmare now, I’ll probably hallucinate that it was all a bad dream induced by too much caffeine … Read more

What is AI? A Complete Guide to Artificial Intelligence

October 30, 2026 by Techie

[ 402.193284] nvidia-uvm: Loaded the UVM driver in 8 module load mode. [ 402.201112] NVRM: GPU at PCI:0000:01:00: GPU-8f2a1c5b-3d4e-5f6a-7b8c-9d0e1f2a3b4c [ 405.881203] torch.cuda.OutOfMemoryError: CUDA out of memory. Tried to allocate 48.00 GiB (GPU 0; 80.00 GiB total capacity; 72.12 GiB already allocated; 1.88 GiB free; 74.00 GiB reserved in total by PyTorch) [ 405.881245] File “/opt/conda/lib/python3.10/site-packages/torch/nn/modules/module.py”, … Read more