Lambda delete event source mapping
Lambda delete event source mapping removes the event source mapping from an AWS Lambda function for a specific duration. Deleting an event source mapping from a Lambda function is critical. It can lead to failure in updating the database on an event trigger, which can break the service.
Lambda delete event source mapping:
- Determines the performance of the application (or service) without the event source mapping that may cause missing entries in a database.
- Determines whether proper error handling or auto-recovery options have been configured for the application.
- Kubernetes version 1.17 or later is required to execute this fault.
- AWS Lambda event source mapping must be healthy and attached to the Lambda function.
- Kubernetes secret should have the AWS access configuration(key) in the
CHAOS_NAMESPACE. A secret file looks like this:
# Add the cloud AWS credentials respectively
aws_access_key_id = XXXXXXXXXXXXXXXXXXX
aws_secret_access_key = XXXXXXXXXXXXXXX
- Harness recommends using the same secret name, that is,
cloud-secret. Otherwise, you must update the
AWS_SHARED_CREDENTIALS_FILEenvironment variable in the fault template and you won't be able to use the default health check probes.
- Refer to AWS named profile for chaos to use a different profile for AWS faults.
- Refer to the superset permission/policy to execute all AWS faults.
- Refer to the common tunables and AWS-specific tunables to tune the common tunables for all faults and AWS-specific tunables.
Below is an example AWS policy to execute the fault.
|FUNCTION_NAME||Function name of the target Lambda function. Supports single function name.|| For example, |
|EVENT_UUIDS||Provide the UUID for the target event source mapping.|| Can provide multiple values as comma-separated values. For example, |
|REGION||The region name of the target Lambda function.|| For example, |
|TOTAL_CHAOS_DURATION||Duration that you specify, through which chaos is injected into the target resource (in seconds).||Default: 30 s|
|SEQUENCE||It defines sequence of chaos execution for multiple instance||Default: parallel. Supports serial and parallel.|
|RAMP_TIME||Period to wait before and after injection of chaos (in seconds).||For example, 30 s|
Multiple event source mapping
Deletes multiple event source mappings for a specific duration using
EVENT_UUIDS environment variable. This variable takes the UUID of the events as a comma-separated value.
The following YAML snippet illustrates the use of this environment variable:
# contains the removal of multiple event source mapping
- name: lambda-delete-event-source-mapping
# provide UUIDS of event source mapping
- name: EVENT_UUIDS
# provide the function name for the chaos
- name: FUNCTION_NAME