Having 12+ Years of Experience in Software Development
Understanding the Linux OOM Killer The Out-Of-Memory (OOM) Killer is a crucial component of the Linux kernel designed to prevent a system from crashing entirely when it runs out of available memory. When the kernel detects that memory pressure is too high and cannot reclaim enough memory through normal means (like swapping or freeing caches), […]
Diagnosing Network Latency and Packet Loss Transient database connection dropouts in C applications hosted on Linode often stem from underlying network instability. Before diving into application-level or database-specific configurations, a thorough network diagnostic is paramount. This involves assessing latency and packet loss between your Linode instance and the database server. The primary tools for this […]
Diagnosing Memory Leaks in Daemon Processes Under Load When daemon processes, particularly those handling high-volume event streams or network requests, begin exhibiting erratic behavior under peak load on Google Cloud, memory leaks are a prime suspect. These leaks, often subtle during development or low-traffic periods, can manifest as gradual memory consumption leading to OOM (Out […]
Diagnosing Intermittent `curl` Socket Timeouts in PHP Intermittent socket timeouts when using `curl` in PHP for third-party API synchronization are notoriously difficult to pin down. They often manifest under load or at specific times, making them seem like phantom issues. This post dives into the systematic debugging and resolution of these elusive problems, focusing on […]
Understanding the `block.json` Validation Context in PHP Rendering When developing custom WordPress themes, especially those with a legacy PHP rendering strategy for blocks, encountering `block.json` validation errors during server-side rendering can be a cryptic debugging challenge. Unlike client-side JavaScript validation, which often provides immediate feedback in the browser console, PHP validation errors are typically logged […]
Identifying the Root Cause: High CPU and Indexing Lock Conflicts When performing bulk stock updates on e-commerce platforms, particularly those hosted on OVH servers, a common symptom is a dramatic spike in CPU usage coupled with intermittent or persistent indexing lock conflicts. This often points to inefficient database operations, specifically within the indexing mechanisms of […]
Understanding WordPress Rewrite Rules and REST API Conflicts WordPress’s rewrite API is a powerful mechanism for creating user-friendly permalinks. However, when developing custom themes or plugins that expose REST API endpoints, especially those that deviate from the standard WordPress URL structure, conflicts with existing rewrite rules can arise. These conflicts often manifest as 404 errors […]
Understanding the XXE Vulnerability in SOAP Parsers XML External Entity (XXE) injection is a critical vulnerability that arises when an XML parser processes untrusted XML input containing references to external entities. In the context of SOAP integrations, particularly those built with older C++ libraries, this often means that the SOAP message body, or even headers, […]
Identifying the Bottleneck: The Shopify Webhook Lifecycle When dealing with webhook ingestion latency under high load in Shopify applications, the first critical step is to pinpoint where the delay is occurring. This isn’t a single point; it’s a chain of events. The typical Shopify webhook lifecycle involves: Shopify queuing the event. Shopify sending the HTTP […]
Understanding the Linux OOM Killer The Out-Of-Memory (OOM) Killer is a crucial component of the Linux kernel designed to prevent a system from crashing when it runs out of available memory. When the kernel detects a severe memory shortage, it invokes the OOM Killer to select and terminate one or more processes. This action frees […]