Execute the following steps to export or import a table from Cloud Bigtable:

1. To export a table from Cloud Bigtable, first we need to identify its column families. To do so, first install the cbt utility:

    gcloud components update
    gcloud components install cbt

2. Use the cbt tool to list out the column families and determine which column families you want to export:

    cbt -instance <<INSTANCE_ID>> ls <<TABLE_NAME>>

3. Create a Cloud Storage Bucket using the gsutil mb command.
4. Now, the table will be exported as sequence files. To export them, download and install import/export jar for Bigtable using this URL:

curl -f -O http://repo1.maven.org/maven2/com/google/cloud/bigtable/bigtable-beam-import/1.1.2/bigtable-beam-import-1.1.2-shaded.jar
  

5. Run the following command and replace <<Export_path>> and <<Temp_Path>> as per your requirement:

    java -jar bigtable-beam-import-1.1.2-shaded.jar export 
        --runner=dataflow 
        --project=<<Project_ID>> 
        --bigtableInstanceId=<<INSTANCE_ID>> 
        --bigtableTableId=<<TABLE_ID>> 
        --destinationPath=gs://<<BUCKET_NAME>>/<<EXPORT_PATH>> 
        --tempLocation=gs://<<BUCKET_NAME>>/<<TEMP_PATH>> 
        --maxNumWorkers=<<10x_NUMBER_OF_NODES>>

6. Similarly, to import a table into Cloud Bigtable, use the following command:

    java -jar bigtable-beam-import-1.1.2-shaded.jar import 
      --runner=dataflow 
      --project=<<PROJECT_ID>> 
      --bigtableInstanceId=<<INSTANCE_ID>> 
      --bigtableTableId=<<TABLE_ID>> 
      --sourcePattern='gs://<<BUCKET_NAME>>/<<EXPORT_PATH>>/part-*' 
      --tempLocation=gs://<<BUCKET_NAME>>/<<TEMP_PATH>> 
      --maxNumWorkers=<<5x_NUMBER_OF_NODES>>