4. Apache Spark Streaming* Aapche Flink* Apache Storm* Apache Storm Trident* Apache Gearpump* Twitter Heron* This is the critical part, as it affects many features Micro-Batch Checkpoint per Batch Continuous Streaming Checkpoint “per Batch” Source Operator Sink Acker Source Operator Sink JobManager/ HDFS id offset state str ack Source Operator Sink Driver Storage Storage job status HDFS id offset