CloudBigtableConfiguration config
Connection connection
org.slf4j.Logger DOFN_LOG
Map<String,ValueProvider<String>> configuration
long estimatedSize
NOTE: This value is a guesstimate. It could be significantly off, especially if there is
a Scan selected in the configuration. It will also be off if the start and stop
keys are calculated via
CloudBigtableIO.Source.split(long, PipelineOptions).
ValueProvider<com.google.bigtable.repackaged.com.google.bigtable.v2.ReadRowsRequest> request
ValueProvider<String> tableId