Zensar Technologies—Cassandra DBA

Job description

Description: 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. Requirements: 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. Responsibilities: 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.