I'm trying to understand what the following configurations mean and their implication on reading data from a MySQL table. I'm looking for options that will impact my read throughput when reading data from a large table.
Thanks. partitionColumn, lowerBound, upperBound, numPartitions These options must all be specified if any of them is specified. They describe how to partition the table when reading in parallel from multiple workers. partitionColumn must be a numeric column from the table in question. Notice thatlowerBound and upperBound are just used to decide the partition stride, not for filtering the rows in table. So all rows in the table will be partitioned and returned.
