I have a simple localstack pipeline:

• Kinesis with a single shard
• Single lambda function reading the data

When setting the lambda function event_source_mapping the StartingPosition is always being set to LATEST regardless of what was input. I have tried with awscli and boto3 with the same results. Am I doing something incorrectly?

No matter what I put in the --starting-position argument it always returns with LATEST selected.

I have tried with awscli and boto3 with the same results. Am I doing something incorrectly?

Example awscli code:

aws --endpoint-url=http://localhost:4566 lambda create-event-source-mapping --function-name lambda_2_db --event-source arn:aws:kinesis:us-east-1:000000000000:stream/polling_single_shard --batch-size 100 --starting-position TRIM_HORIZON

Console output: