Xinyu Liu created SAMZA-863:
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Summary: Support multi-threading in samza tasks
Key: SAMZA-863
URL: https://issues.apache.org/jira/browse/SAMZA-863
Project: Samza
Issue Type: New Feature
Reporter: Xinyu Liu
Assignee: Xinyu Liu
Currently a samza container executes the tasks sequentially in a single thread.
For example, we have message 1 and 2 in the pending queue for task 1 and task
2. Task 1 will process message 1, and util its completion task 2 can process
message 2. If we want to handle more messages in parallel, we have to increase
the container count, e.g. from 1 to 2 in the example.
While this solution has been working for many CPU-bound job scenarios, we do
see its drawback for IO-bound jobs.In this kind of jobs, the task makes
IO/Network requests, i.e, db calls, rest calls or external service RPC calls.
These IO calls significantly slow down the task processing. We can increase
container number in order to parallelize the IO calls, but it results in low
CPU utilization. If we can improve CPU utilization by allocating multiple
contains in the same CPU core, it will still cause dramatic memory growth due
to the memory being allocated for each container.
To better scale the performance of IO-bound jobs, we are proposing to support
multi-threaded processing in samza. The design proposal will come soon.
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