Problem: Deployment fails due to CloudFormation FAILURE signals
When deploying the solution, the deployment may fail due to CloudFormation FAILURE signals.

Solution deployment - error message
Resolution
The issue arises from the fact that the corresponding Druid process is unable to transition into service.
To identify the underlying cause:
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In the primary account, navigate to the CloudWatch console
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Choose the log group named
/aws/solutions/druid/<cluster name>
. The provided screenshot displays the log group for the example cluster dev298.CloudWatch - Log groups
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Select the log stream by searching for the instance ID found in the CloudFormation console.
CloudWatch - Log streams
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Inspect the relevant logs to determine the reason the instance does not start correctly.