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Instances are distributed across hardware raacks. 7 PARTIONS PER AZ
Can span across mulitple AZs
Upto 100 of EC2 instances
Partition donot share racks
A partion failure can affect many EC2 but wont affect other
EC2 instancessget access to partion information as metadata.
Use cases: HDFS, HBASE, Cassandra, Kafka