Cassandra DBA Jr

Cassandra Performance Tuning Analyze and optimize read/write performance and latency. Tune compaction, caching, consistency levels, tombstones, SSTables, and Cassandra configuration. Identify hot partitions, slow queries, and resource bottlenecks. Design and manage highly available, scalable Cassandra clusters. Strong understanding of Cassandra architecture, replication, consistency levels, partitioning, data modeling, and multi-DC deployments. Capacity planning and cluster topology design. Node Expansion & Cluster Management Add, replace, remove, and decommission Cassandra nodes safely. Perform cluster expansion and capacity upgrades with minimal production impact. Manage token distribution, bootstrap/streaming, repair, cleanup, and cluster rebalancing. Backup & Recovery Implement and maintain Cassandra backup and restore strategies. Perform snapshots, incremental backups, and point-in-time recovery where supported by the backup solution. Conduct recovery testing and support disaster-recovery procedures. JVM & System Tuning Tune Cassandra JVM heap, garbage collection, and memory settings. Troubleshoot GC pauses, heap pressure, CPU, disk I/O, and memory issues. Tune Linux/OS and storage configurations for Cassandra workloads. Monitoring & Troubleshooting Monitor cluster health, availability, latency, throughput, disk usage, compactions, dropped messages, GC, and repairs. Troubleshoot production issues including node failures, high latency, timeouts, replica inconsistencies, and capacity problems. Strong experience with nodetool, Cassandra logs, metrics, tracing, and monitoring/alerting platforms.