presto-kinesis/src/main/java/io/prestosql/plugin/kinesis/KinesisShardCheckpointer.java/KinesisShardCheckpointer/createCheckpointKey
class KinesisShardCheckpointer:    private String createCheckpointKey(int iterationNo)
    {
        return new StringBuilder(this.logicalProcessName)
                .append("_")
                .append(this.kinesisSplit.getStreamName())
                .append("_")
                .append(this.kinesisSplit.getShardId())
                .append("_")
                .append(String.valueOf(iterationNo))
                .toString();
    }