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Latest from 360 Tech Engineering

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360 Tech Engineering

May 31, 2021 · Databases

Understanding MongoDB TTL Indexes: Concepts, Operation, Creation Methods, Limitations, and Best Practices

This article explains MongoDB TTL indexes, covering their basic concept as single‑field auto‑deletion indexes, how the background process works, alternative creation methods using an expireAt field, practical limitations, and recommendations for designing efficient data expiration strategies.

Database MaintenanceMongoDBTTL Index

0 likes · 7 min read

Understanding MongoDB TTL Indexes: Concepts, Operation, Creation Methods, Limitations, and Best Practices

360 Tech Engineering

May 24, 2021 · Cloud Native

Understanding the Calico CNI Plugin: Code Walkthrough and Network Resource Creation

This article provides a detailed walkthrough of the Calico CNI plugin source code, explaining how the calico and calico‑ipam binaries are built, how the ADD command creates WorkloadEndpoint objects, veth pairs, routes, and sysctl settings, and how these components integrate with the Calico datastore in a Kubernetes environment.

CalicoContainerNetworkingGo

0 likes · 16 min read

Understanding the Calico CNI Plugin: Code Walkthrough and Network Resource Creation

360 Tech Engineering

May 17, 2021 · Mobile Development

Model-Based Android UI Testing: View Tree Definition and Action Event Filtering

This article explains how to define Android UI pages as view trees, convert them to list structures, generate unique page signatures, and filter actionable events such as scrollable and clickable views using Python, enabling more effective model‑based testing of mobile applications.

AndroidEvent FilteringPython

0 likes · 8 min read

Model-Based Android UI Testing: View Tree Definition and Action Event Filtering

360 Tech Engineering

May 14, 2021 · Backend Development

Introduction to GraphQL: Concepts, Usage, and a Python Flask Implementation

This article explains the limitations of traditional RESTful APIs, introduces GraphQL as a flexible query language, details its core concepts such as operation types, object and scalar types, and schema definition, and provides a complete Python Flask example with code analysis, execution steps, and a discussion of its advantages and drawbacks.

APIFlaskGraphQL

0 likes · 9 min read

Introduction to GraphQL: Concepts, Usage, and a Python Flask Implementation

360 Tech Engineering

May 10, 2021 · Cloud Native

Understanding kube-proxy Service Implementation and Packet Flow with Calico in Kubernetes

This guide explains how kube-proxy in iptables mode, together with Calico BGP routing, translates service IPs to pod IPs, creates custom iptables chains, and routes traffic from external or node ports to the correct pod across a Kubernetes cluster.

BGPNetworkingService

0 likes · 11 min read

Understanding kube-proxy Service Implementation and Packet Flow with Calico in Kubernetes

360 Tech Engineering

May 7, 2021 · Databases

MongoDB Sharding Key Query Failure and Unique Index Violation Explained

This article reproduces a MongoDB issue where queries using a hashed sharding key return no results and a unique compound index appears to fail, then explains the root cause—index entries exceeding the 1024‑byte limit and the failIndexKeyTooLong parameter—providing step‑by‑step commands, configuration changes, and practical recommendations.

Unique IndexfailIndexKeyTooLongindexing

0 likes · 35 min read

MongoDB Sharding Key Query Failure and Unique Index Violation Explained

360 Tech Engineering

Apr 23, 2021 · Backend Development

Rate Limiting Overview: Concepts, Architectures, Algorithms, and Redis + Lua Token‑Bucket Implementation

This article explains what rate limiting is, why it is needed, the typical actions triggered by limiting, compares single‑node and distributed architectures, reviews four common limiting algorithms, and provides a detailed Redis‑Lua token‑bucket implementation with full source code.

BackendLuaRate Limiting

0 likes · 14 min read

Rate Limiting Overview: Concepts, Architectures, Algorithms, and Redis + Lua Token‑Bucket Implementation

360 Tech Engineering

Apr 19, 2021 · Cloud Native

How Calico CNI Plugin Creates Pod Network When Kubelet Launches a Sandbox Container

This article explains the step‑by‑step process by which kubelet creates a sandbox container, invokes the CNI interface, runs Calico’s ADD command, and sets up routes, virtual interfaces, and IP allocation for pods in a Kubernetes cluster, including relevant Go code excerpts.

CalicoGoKubernetes

0 likes · 12 min read

How Calico CNI Plugin Creates Pod Network When Kubelet Launches a Sandbox Container

360 Tech Engineering

Apr 16, 2021 · Artificial Intelligence

Applying YOLOv5 Object Detection for Black, Color, and Normal Screen Classification in Video Frames

This article presents a method that replaces traditional manual video frame quality checks with an automated YOLOv5‑based object detection pipeline, detailing data labeling, model training, loss computation, inference code, and experimental results that show higher accuracy than ResNet for classifying black, color‑screen, and normal frames.

Object DetectionPythonYOLOv5

0 likes · 12 min read

Applying YOLOv5 Object Detection for Black, Color, and Normal Screen Classification in Video Frames

360 Tech Engineering

Apr 12, 2021 · Operations

Mellanox CX-5 NIC OVS Flow Table Acceleration and SR‑IOV VF Migration Guide

This guide details the investigation of Mellanox CX‑5 NIC support for OVS flow‑table acceleration, outlines required software versions, explains VT‑d and SR‑IOV technologies, provides step‑by‑step host configuration, OVS setup, test procedures, performance results in VXLAN and VLAN environments, and explores the feasibility and scripts for VF hot‑migration.

LinuxMellanoxOVS

0 likes · 10 min read

Mellanox CX-5 NIC OVS Flow Table Acceleration and SR‑IOV VF Migration Guide