`bigquery-to-datastore`

This allows us to export a BigQuery table to a Google Datastore kind using Apache Beam on top of Google Dataflow.

You don't have to have duplicated rows whose key values are same. Apache Beam's DatastoreIO doesn't allow us to write same key at once.

Requirements

Maven
Java 1.8+
Google Cloud Platform account

Usage

Required arguments

--project: Google Cloud Project
--inputBigQueryDataset: Input BigQuery dataset ID
--inputBigQueryTable: Input BigQuery table ID
--keyColumn: BigQuery column name for a key of Google Datastore kind
--outputDatastoreNamespace: Output Google Datastore namespace
--outputDatastoreKind: OUtput Google Datastore kind
--tempLocation: The Cloud Storage path to use for temporary files. Must be a valid Cloud Storage URL, beginning with gs://.
--gcpTempLocation: A GCS path for storing temporary files in GCP.

Optional arguments

--runner: Apache Beam runner.
- When you don't set this option, it will run on your local machine, not Google Dataflow.
- e.g. DataflowRunner
--parentPaths: Output Google Datastore parent path(s)
- e.g. Parent1:p1,Parent2:p2 ==> KEY('Parent1', 'p1', 'Parent2', 'p2')
--indexedColumns: Indexed columns on Google Datastore.
- e.g. col1,col2,col3 ==> col1, col2 and col2 are indexed on Google Datastore.
--numWorkers: The number of workers when you run it on top of Google Dataflow.
--workerMachineType: Google Dataflow worker instance type
- e.g. n1-standard-1, n1-standard-4

Example to run on Google Dataflow

# compile
mvn clean package

# Run bigquery-to-datastore via the compiled JAR file
java -cp $(pwd)/target/bigquery-to-datastore-bundled-0.5.1.jar \
  com.github.yuiskw.beam.BigQuery2Datastore \
  --project=your-gcp-project \
  --runner=DataflowRunner \
  --inputBigQueryDataset=test_dataset \
  --inputBigQueryTable=test_table \
  --outputDatastoreNamespace=test_namespace \
  --outputDatastoreKind=TestKind \
  --parentPaths=Parent1:p1,Parent2:p2 \
  --keyColumn=id \
  --indexedColumns=col1,col2,col3 \
  --tempLocation=gs://test_bucket/test-log/ \
  --gcpTempLocation=gs://test_bucket/test-log/

How to run

How to build and run it with java

# compile
mvn clean package
# or
make package

# run
java -cp $(pwd)/target/bigquery-to-datastore-bundled-0.5.1.jar --help
# or
./bin/bigquery-to-datastore --help

How to run it on docker

We also offers docker images for this project in yuiskw/bigquery-to-datastore - Docker Hub. We have several docker images based on Apache Beam versions.

docker run yuiskw/bigquery-to-datastore:0.5.1-beam-2.1 --help

How to install it with homebrew

You can install it with homebrew from yu-iskw/homebrew-bigquery-to-datastore.

# install
brew install yu-iskw/bigquery-to-datastore/bigquery-to-datastore

# show help
./bin/bigquery-to-datastore --help

Type conversions between BigQuery and Google Datastore

The below table describes the type conversions between BigQuery and Google Datastore. Since Datastore unfortunately doesn't have any data type for time, bigquery-to-datastore ignore BigQuery columns whose data type are TIME.

BigQuery	Datastore
BOOLEAN	bool
INTEGER	int
DOUBLE	double
STRING	string
TIMESTAMP	timestamp
DATE	timestamp
TIME	ignored: Google Datastore doesn't have time type.
RECORD	array
STRUCT	`Entity`

Note

As you probably know, Google Datastore doesn't have any feature much like UPDATE of MySQL. Since DatastoreIO.Write upsert given input entities, it will just overwrite an entity whether or not it already exists. If we would like to insert multiple data separately, we have to combine them on bigquery beforehand.

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