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Support EMR clusters with multiple master nodes (#4019)

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Reference: https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-plan-ha-launch.html
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Brian Pandola 2021-06-17 22:04:21 -07:00 • committed by GitHub
commit a95ca81e76
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9
moto/emr/models.py
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@ -332,6 +332,15 @@ class FakeCluster(BaseModel):
if self.master_instance_group_id:
raise Exception("Cannot add another master instance group")
self.master_instance_group_id = instance_group.id
num_master_nodes = instance_group.num_instances
if num_master_nodes > 1:
# Cluster is HA
if num_master_nodes != 3:
raise ValidationException(
"Master instance group must have exactly 3 instances for HA clusters."
)
self.keep_job_flow_alive_when_no_steps = True
self.termination_protected = True
if instance_group.role == "CORE":
if self.core_instance_group_id:
raise Exception("Cannot add another core instance group")