Скачать или смотреть Mastering HDFS Rack Topology: Prevent Data Loss, Optimize Performance

Learn how Hadoop Distributed File System (HDFS) uses rack awareness to prevent data loss and optimize cluster performance. In this video, we break down:

🔹 What Rack Awareness Is:

How HDFS maps DataNodes to physical racks

Why racks are single points of failure (power/network outages)

🔹 Data Placement Secrets:

Default 3-replica strategy: 1st local, 2nd remote rack, 3rd same as 2nd

How HDFS minimizes cross-rack bandwidth (67% intra-rack traffic)

Visual breakdown of replica placement across racks

🔹 Critical Admin Practices:

Configuring topology.script.file.name correctly

Risks of misconfiguration (all replicas in one rack = data loss!)

Ensuring balanced racks & sufficient inter-rack bandwidth

🔹 Key Benefits:

✅ Survive rack failures without data loss

✅ Optimized read/write performance (66% intra-rack reads)

✅ Bandwidth cost reduction

Who Should Watch:

Hadoop Administrators

Data Engineers

DevOps Engineers

Distributed Systems Architects