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Permissive task capability #3866
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Why: We need idempotent forked tasks, meaning all tasks get executed, but any failures are still detected upon join. Feature request Netflix#3861 What: Introduced the concept of Permissive tasks. A Permissive task is similar to a Simple task. The difference is, it permits the other tasks to continue - in case a Permissive task failed. Result is: 1. Forked Permissive tasks will let each other be evaluated, until all the forked tasks had terminated. Only then, the join task should fail. In case of Permissive optional tasks, the join will not fail. 2. Permissive sequential tasks will let subsequent tasks continue. While at the end, the workflow will fail in case a permissive task had failed. The workflow would not fail in case of Permissive optional task failure. Testing done: PermissiveTaskMapperTest added, TestDeciderOutcomes.testPermissive() added, WorkflowAndTaskConfigurationSpec "Test simple workflow which has a permissive task" and "Test simple workflow which has a permissive optional task added" that cover retry, ForkJoinSpec "Test a simple workflow with fork join permissive failure flow" added. In addition, performed e2e tests locally running a Conductor instance. Did build a docker image with the code changes made, started it locally, and started a SampleWorker to poll 3 tasks in parallel. Verified e2e scenarios of task_def_permissive, task_def_permissive_optional, task_def_simple.json, task_def_simple_optional.json, each joining on 6 forked tasks, then running simple task 7 after join.
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Pull Request type
./gradlew generateLock saveLockto refresh dependencies)NOTE: Please remember to run
./gradlew spotlessApplyto fix any format violations. (Check.)Changes in this PR
Why:
We need idempotent forked tasks, meaning all tasks get executed, but any failures are still detected upon join.
Issue #3861
What:
Introduced the concept of Permissive tasks.
A Permissive task is similar to a Simple task. The difference is, it permits the other tasks to continue - in case a Permissive task failed.
Result is:
Testing done:
PermissiveTaskMapperTest added,
TestDeciderOutcomes.testPermissive() added,
WorkflowAndTaskConfigurationSpec "Test simple workflow which has a permissive task" and "Test simple workflow which has a permissive optional task added" that cover retry,
ForkJoinSpec "Test a simple workflow with fork join permissive failure flow" and "Test retrying a failed permissive fork join workflow" added.
In addition, performed e2e tests locally running a Conductor instance. Did build a docker image with the code changes made, started it locally, and started a SampleWorker to poll 3 tasks in parallel. Verified e2e scenarios of task_def_permissive, task_def_permissive_optional, task_def_simple.json, task_def_simple_optional.json, each joining on 6 forked tasks, then running simple task 7 after join.
Alternatives considered