Mehrdad Nurolahzade created AURORA-1924:
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Summary: Aurora client should reconcile idempotent job creations
Key: AURORA-1924
URL: https://issues.apache.org/jira/browse/AURORA-1924
Project: Aurora
Issue Type: Story
Components: Client, Scheduler
Reporter: Mehrdad Nurolahzade
Priority: Minor
Aurora scheduler rejects a request to create a job if a job with the same key
already exists (see {{SchedulerThriftInterface.createJob()}}). Aurora client
exits with an error once it receives a response with
{{ResponseCode.INVALID_REQUEST}} from scheduler in this case.
However, an attempt to create a job with the exact same configuration and
number of instances is essentially idempotent. Scheduler can detect this
situation, ignore it, and signal client to treat operation as successful;
client warns user about existing job but does not fail the operation.
This helps Aurora client and scheduler reconcile state when creating jobs in
presence of transport layer exceptions; allowing {{aurora job create}} command
can then be marked as idempotent after [AURORA-1923] is fixed.
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