Spark, flink and a few proprietary tools can operate in both batch and streaming modes which means you can share your codebase between both tasks if you do them. Before these tools it used to be hadoop for batch and storm for streaming, but I suspect those days are dying now (which goes some way to explaining spark's success) except if you require exceptional throughput in which case do some research & benchmarks.
Probably never.
Spark, flink and a few proprietary tools can operate in both batch and streaming modes which means you can share your codebase between both tasks if you do them. Before these tools it used to be hadoop for batch and storm for streaming, but I suspect those days are dying now (which goes some way to explaining spark's success) except if you require exceptional throughput in which case do some research & benchmarks.