Bharath Kumarasubramanian created SAMZA-2781:
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Summary: Use framework thread to execute hand-offs and sub-DAG
execution
Key: SAMZA-2781
URL: https://issues.apache.org/jira/browse/SAMZA-2781
Project: Samza
Issue Type: Improvement
Reporter: Bharath Kumarasubramanian
Assignee: Bharath Kumarasubramanian
{*}Summary{*}: Use framework thread pool to execute operator hand-offs and
synchronous sub-DAG executions.
{*}Description{*}: Currently, the operator implementation chains the future
using synchronous APIs (thenCompose, thenApply) which results in execution of
these method calls on the future completion thread which happens to be the user
thread in case of asynchronous operators in application DAG.
{*}Changes{*}:
* Use thread pool inject through `job.container.task.executor.factory`
* Extend the task executor factory to return operator executor
* Wire in the task executor in `TaskContext`
* Default implementation which uses `#getTaskExecutor` if enabled and
`job.container.thread.pool.size` > 1 or fallback to `ForkJoinPool` if disabled.
* Unit tests for the factory
* Test updates
{*}API Changes{*}:
* Add `getOperatorExecutor` to `TaskExecutorFactory`
* Provide a default implementation that reuses `getTaskExecutor`
{*}Usage Instructions{*}:
{*}Upgrade Instructions{*}:
* The operator hand off will use `ForkJoinPool` if no changes are made to
application. Users may have to tune JVM `ForkJoinPool` to match their user
thread pool size if they notice performance degradation.
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