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Ensure ephemeral Redshift cluster accepts TCP connections #29011

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Merged
ebyhr merged 1 commit into from
Apr 8, 2026
Merged

Ensure ephemeral Redshift cluster accepts TCP connections #29011

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20 changes: 19 additions & 1 deletion .github/bin/redshift/setup-aws-redshift.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ echo "Waiting for the Amazon Redshift cluster ${REDSHIFT_CLUSTER_IDENTIFIER} on
aws redshift wait cluster-available \
--cluster-identifier ${REDSHIFT_CLUSTER_IDENTIFIER}

echo "The Amazon Redshift cluster ${REDSHIFT_CLUSTER_IDENTIFIER} on the region ${AWS_REGION} is available for queries."
echo "The Amazon Redshift cluster ${REDSHIFT_CLUSTER_IDENTIFIER} on the region ${AWS_REGION} reports available status."

REDSHIFT_CLUSTER_DESCRIPTION=$(aws redshift describe-clusters --cluster-identifier ${REDSHIFT_CLUSTER_IDENTIFIER})

Expand All @@ -52,3 +52,21 @@ export REDSHIFT_PORT=$(echo ${REDSHIFT_CLUSTER_DESCRIPTION} | jq -r '.Clusters[0
export REDSHIFT_CLUSTER_DATABASE_NAME=$(echo ${REDSHIFT_CLUSTER_DESCRIPTION} | jq -r '.Clusters[0].DBName' )
export REDSHIFT_USER=$(echo ${REDSHIFT_CLUSTER_DESCRIPTION} | jq -r '.Clusters[0].MasterUsername' )
export REDSHIFT_PASSWORD

# The AWS API status "available" doesn't guarantee the endpoint is accepting connections yet.
# Poll the actual TCP port until Redshift is truly ready.
echo "Waiting for the Redshift endpoint ${REDSHIFT_ENDPOINT}:${REDSHIFT_PORT} to accept connections..."
MAX_RETRIES=30
RETRY_INTERVAL_SECONDS=10
for ((i=1; i<=MAX_RETRIES; i++)); do
if nc -z -w 5 "${REDSHIFT_ENDPOINT}" "${REDSHIFT_PORT}" 2>/dev/null; then
echo "The Amazon Redshift cluster ${REDSHIFT_CLUSTER_IDENTIFIER} on the region ${AWS_REGION} is accepting connections."
break
fi
if [ "$i" -eq "$MAX_RETRIES" ]; then
echo "ERROR: Redshift endpoint ${REDSHIFT_ENDPOINT}:${REDSHIFT_PORT} did not become reachable after $((MAX_RETRIES * RETRY_INTERVAL_SECONDS)) seconds."
exit 1
fi
echo " Attempt ${i}/${MAX_RETRIES}: endpoint not ready yet, retrying in ${RETRY_INTERVAL_SECONDS}s..."
sleep ${RETRY_INTERVAL_SECONDS}
done