Urgently: Slow Apache Cassandra on EC2 instances.

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11+ years experience Cassandra database Administrator • Experience in installing, configuring and monitoring DataStax Cluster (Enterprise Edition). • Experience on Installed and configured multi-nodes fully distributed Cassandra cluster. • Understanding of Cassandra cluster management by using datastax Opscenter, Devcenter and nodetool utility commands • Understanding Cassandra snapshotBackup & Recovery. • Knowledge in Cassandra read and write paths and internal architecture. • Installed and Configured DataStax OpsCenter for Cassandra Cluster maintenance and alerts. • Involved in data migrations, Incremental backups and data restores using ‘Snapshots’ and 'SStableloader' in Cassandra • Managing NoSQL distributed database Cluster that includes adding and removing cluster nodes, cluster capacity planning, performance tuning, cluster Monitoring, Troubleshooting.