How to load data into Google Cloud Bigtable from Google BigQuery

问题

I need to populate data into Google Cloud Bigtable and the source of the data will be Google BigQuery.

As an exercise, I am able to read the data from BigQuery and as an seperate exercise I am able to write data into Bigtable as well.

Now I have to combine these 2 operations into one Google Cloud Dataflow job. Any example will be of great help.

回答1:

You can just use the transforms as shown in those examples, adding whatever logic you need in between, for example:

Pipeline p = Pipeline.create(options);
 .apply(BigQueryIO.Read.from("some_table"))
 .apply(ParDo.of(new DoFn<TableRow, Row>() {
   public void processElement(ProcessContext c) {
     Row output = somehowConvertYourDataToARow(c.element());
     c.output(output);
   }
   })
 .apply(BigtableIO.Write.withTableId("some_other_table");

回答2:

For a people who want to transform bigquery data to bigtable in future can refer to following link

Ref : https://github.com/GoogleCloudPlatform/cloud-bigtable-examples/blob/master/java/dataflow-connector-examples/src/main/java/com/google/cloud/bigtable/dataflow/example/BigQueryBigtableTransfer.java

来源：https://stackoverflow.com/questions/39044341/how-to-load-data-into-google-cloud-bigtable-from-google-bigquery