Скачать или смотреть Stop HDFS Crashes & GC Pauses: The Definitive JVM Tuning Guide for Hadoop Clusters

*Struggling with NameNode freezes, DataNode timeouts, or JournalNode failovers?* This step-by-step guide reveals production-proven JVM tuning strategies to eliminate GC pauses, OutOfMemory crashes, and cluster instability in HDFS.

*You’ll Learn How To:*
✅ **Right-Size Heaps**: Calculate exact heap requirements for NameNodes ,DataNodes, & JournalNodes
✅ **Tame Garbage Collection**: Configure G1GC for NameNodes
✅ **Avoid OOM Disasters**: Critical flags like -XX:G1ReservePercent=25 and -XX:MaxDirectMemorySize
✅ **Optimize Off-Heap**: Balance direct memory for DataNode zero-copy I/O
✅ **Monitor Like a Pro**: jstat, GC log analysis & key alerts for pauses

*Includes Ready-to-Use Templates:*
🔥 **NameNode Config**:
`-Xms100g -Xmx100g -XX:+UseG1GC -XX:G1HeapRegionSize=32m`
🔥 **DataNode Config**:
`-Xmx8g -XX:MaxDirectMemorySize=2g -XX:+UseConcMarkSweepGC`

*Tools Covered:* jstat, JMX, GCViewer, GCEasy + Heap dump analysis

👉 *Don’t forget to bookmark this video!* Includes downloadable troubleshooting checklist for crashes, long GC pauses, and upgrade validation.

#HDFS #JVMTuning #Hadoop #NameNode #DataNode #GarbageCollection #BigData #DevOps #ClusterOptimization