AWS Redshift serverless - how to get the cluster id value - amazon-web-services

Question

I'm following the AWS documentation about how to connect to redshift [generating user credentials][1]
But the get-cluster-credentials API requires a cluster id parameter, which i don't have for a serverless endpoint. What id should I use?
EDIT:
[![enter image description here][2]][2]
This is the screen of a serverless endpoint dashboard. There is no cluster ID.
[1]: https://docs.aws.amazon.com/redshift/latest/mgmt/generating-user-credentials.html
[2]: https://i.stack.imgur.com/VzvIs.png

Answer 1

Look at this Guide (a newer one) that talks about Connecting to Amazon Redshift Serverless. https://docs.aws.amazon.com/redshift/latest/mgmt/serverless-connecting.html
See this information that answers your question:
Connecting to the serverless endpoint with the Data API
You can also use the Amazon Redshift Data API to connect to serverless endpoint. Leave off the cluster-identifier parameter in your AWS CLI calls to route your query to serverless endpoint.
UPDATE
I wanted to test this to make sure that a successful connection can be made. I followed this doc to setup a Serverless instance.
Get started with Amazon Redshift Serverless
I loaded sample data and now have this.
Now I attemped to connect to it using software.amazon.awssdk.services.redshiftdata.RedshiftDataClient.
The Java V2 code:
try {
ExecuteStatementRequest statementRequest = ExecuteStatementRequest.builder()
.database(database)
.sql(sqlStatement)
.build();
ExecuteStatementResponse response = redshiftDataClient.executeStatement(statementRequest);
return response.id();
} catch (RedshiftDataException e) {
System.err.println(e.getMessage());
System.exit(1);
}
return "";
}
Notice there is no cluster id or user. Only a database name (sample_data_dev). The call worked perfectly.
HEre is the full code example that successfully queries data from a serverless instance using the AWS SDK for Java V2.
package com.example.redshiftdata;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.redshiftdata.model.*;
import software.amazon.awssdk.services.redshiftdata.RedshiftDataClient;
import software.amazon.awssdk.services.redshiftdata.model.DescribeStatementRequest;
import java.util.List;
/**
* To run this Java V2 code example, ensure that you have setup your development environment, including your credentials.
*
* For information, see this documentation topic:
*
* https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
*/
public class RetrieveDataServerless {
public static void main(String[] args) {
final String USAGE = "\n" +
"Usage:\n" +
" RetrieveData <database> <sqlStatement> \n\n" +
"Where:\n" +
" database - the name of the database (for example, sample_data_dev). \n" +
" sqlStatement - the sql statement to use. \n" ;
String database = "sample_data_dev" ;
String sqlStatement = "Select * from tickit.sales" ;
Region region = Region.US_WEST_2;
RedshiftDataClient redshiftDataClient = RedshiftDataClient.builder()
.region(region)
.build();
String id = performSQLStatement(redshiftDataClient, database, sqlStatement);
System.out.println("The identifier of the statement is "+id);
checkStatement(redshiftDataClient,id );
getResults(redshiftDataClient, id);
redshiftDataClient.close();
}
public static void checkStatement(RedshiftDataClient redshiftDataClient,String sqlId ) {
try {
DescribeStatementRequest statementRequest = DescribeStatementRequest.builder()
.id(sqlId)
.build() ;
// Wait until the sql statement processing is finished.
boolean finished = false;
String status = "";
while (!finished) {
DescribeStatementResponse response = redshiftDataClient.describeStatement(statementRequest);
status = response.statusAsString();
System.out.println("..."+status);
if (status.compareTo("FINISHED") == 0) {
break;
}
Thread.sleep(1000);
}
System.out.println("The statement is finished!");
} catch (RedshiftDataException | InterruptedException e) {
System.err.println(e.getMessage());
System.exit(1);
}
}
public static String performSQLStatement(RedshiftDataClient redshiftDataClient,
String database,
String sqlStatement) {
try {
ExecuteStatementRequest statementRequest = ExecuteStatementRequest.builder()
.database(database)
.sql(sqlStatement)
.build();
ExecuteStatementResponse response = redshiftDataClient.executeStatement(statementRequest);
return response.id();
} catch (RedshiftDataException e) {
System.err.println(e.getMessage());
System.exit(1);
}
return "";
}
public static void getResults(RedshiftDataClient redshiftDataClient, String statementId) {
try {
GetStatementResultRequest resultRequest = GetStatementResultRequest.builder()
.id(statementId)
.build();
GetStatementResultResponse response = redshiftDataClient.getStatementResult(resultRequest);
// Iterate through the List element where each element is a List object.
List<List<Field>> dataList = response.records();
// Print out the records.
for (List list: dataList) {
for (Object myField:list) {
Field field = (Field) myField;
String value = field.stringValue();
if (value != null)
System.out.println("The value of the field is " + value);
}
}
} catch (RedshiftDataException e) {
System.err.println(e.getMessage());
System.exit(1);
}
}
}