Learn a step‑by‑step process for migrating Kubernetes clusters (v1.24+) from the deprecated Docker runtime to the native Containerd CRI, covering compatibility checks, node preparation, installation, configuration, node draining, kubelet updates, validation, and common pitfalls such as cgroup driver mismatches.
Valkey 9.0, the latest community‑driven fork of Redis, introduces multi‑path TCP support, per‑field hash expiration, atomic slot migration, and new safety commands, offering developers enhanced performance, finer‑grained data control, and more reliable cluster operations.
This article details Tencent Cloud engineers' technical solutions for large‑scale Apache Pulsar deployments, covering multi‑network access challenges, a routing‑addressing redesign, product deployment models, a four‑step cluster migration process with subscription‑progress compensation, and high‑availability best practices such as rack‑aware and cross‑AZ replica distribution.
The article describes how an automated resource‑balancing system continuously monitors Redis host memory usage, selects optimal nodes, safely migrates them through a multi‑step process (adding slaves, verifying replication, promoting masters, deleting old nodes), and provides task management and notification features to maintain high availability and reduce manual DBA effort.
This guide details a step‑by‑step migration plan for HBase and HDFS clusters, covering background, high‑availability architecture, role assignments, expansion and shrinkage of ZooKeeper and JournalNode, NameNode and DataNode migration, rolling restarts, and common upgrade pitfalls.
This article details the end‑to‑end process of moving Qunar's massive Elasticsearch logging cluster from a saturated data‑center to a new facility, covering background constraints, migration planning, manual and automated steps, performance‑tuning parameters, shard‑balancing techniques, and the final outcomes achieved.
This article details the end‑to‑end migration of Qunar's massive Elasticsearch logging cluster from a saturated data‑center to a new facility, covering background constraints, migration planning, manual and automated node moves, performance tuning parameters, observed challenges, and the final zero‑downtime results.
This article details the background, challenges, migration plan, automation, and performance‑tuning techniques used to relocate a petabyte‑scale Elasticsearch logging cluster from one data center to another, highlighting practical lessons and measurable improvements in stability and migration speed.
This article details how Ping An Insurance migrated its offline Hive SQL workloads to Spark SQL, covering business background, deployment mode selection, migration workflow, typical challenges, optimization measures, and the resulting performance and resource utilization improvements.
This guide details how to modify Ceph monitor (MON) IP addresses when moving a Ceph cluster to a new data center, covering both same‑network IP changes by adding and removing MON nodes and full‑network IP updates using monmaptool, with step‑by‑step commands and troubleshooting tips.
This article details the end‑to‑end process of migrating a 10,000‑node offline data‑warehouse from CDH 5.14.4 (HDFS 2.6.0) to HDP 3.1.4 (HDFS 3.1.1), covering version selection, rolling‑upgrade strategy, incompatibility fixes, client handling, tool coexistence, testing, automation, and lessons learned.
This article analyzes the problems caused by multiple independent RocketMQ clusters, outlines the current cluster architecture, details pre‑migration preparations, compares two migration schemes (one not recommended and one recommended), and summarizes the benefits of consolidating clusters into a single, well‑managed deployment.
This article details a real‑world multi‑cloud cluster migration, covering preparation, testing strategies, traffic replay, performance validation, latency simulation, and communication practices that enabled a successful two‑hour cutover without impacting critical services.
This article details Tongcheng Travel’s month‑long, zero‑downtime migration of hundreds of petabytes of Hadoop HDFS and YARN clusters across data centers, describing the background, migration strategies, lessons learned, tool enhancements, and future plans to improve data locality, balance, and monitoring.
Accidental namespace deletions in Kubernetes can cause massive data loss, but by using etcd snapshots, resource‑level backup tools like Velero, PX‑Backup, and Kasten, and configuring scheduled backups, hooks, and PVC migration, you can protect clusters, streamline recovery, and avoid painful manual redeployments.
This article walks through a practical, step‑by‑step migration of an Elasticsearch cluster from a public‑cloud environment to a self‑hosted data‑center, covering strategy, configuration changes, node role separation, manual data transfer, and post‑migration re‑enabling of automatic balancing to ensure a smooth, low‑impact transition.
The team performed a rolling upgrade of HDFS from 2.7 to 3.2 on large clusters, resolving EditLog, Fsimage, StringTable and authentication incompatibilities by omitting EC data, using fallback images, rolling back commits and first upgrading to the latest 2.x release, following a staged JournalNode‑NameNode‑DataNode procedure, validating with rehearsals and a custom trash‑management tool, and achieving uninterrupted service, improved stability, performance and cost efficiency.
The article details Snowball's challenges with a saturated CDH Hadoop cluster, outlines the limitations of the original Kafka‑based log pipeline, and explains how a comprehensive redesign using FlumeNG, Spillable Memory Channels, and custom HDFS sinks resolves latency, data loss, and high‑load issues while supporting future growth.
