Migrating data from Amazon Redshift

Overview

This document describes the process of migrating data from Amazon Redshift to BigQuery.

The BigQuery Data Transfer Service allows you to copy your data from an Amazon Redshift data warehouse to BigQuery. The service will engage migration agents in GKE and trigger an unload operation from Amazon Redshift to a staging area in an Amazon S3 bucket. Then the BigQuery Data Transfer Service transfers your data from the Amazon S3 bucket to BigQuery.

This diagram shows the overall flow of data between an Amazon Redshift data warehouse and BigQuery during a migration.

Before you begin

This section describes the step-by-step process of setting up a data migration from Amazon Redshift to BigQuery. The steps are:

  • Meet the prerequisites and set permissions on Google Cloud.
  • Grant access to your Amazon Redshift cluster.
  • Grant access to your Amazon S3 staging bucket.
  • Set up the migration with the BigQuery Data Transfer Service. You will need:
    • The Amazon Redshift JDBC url. Follow these instructions to obtain the JDBC url.
    • The username and password of your Amazon Redshift database.
    • The AWS access key pair you will obtain from the step: Grant access to your S3 bucket.
    • The URI of the Amazon S3 bucket you'll use to temporarily stage data. It's recommended that you set up a Lifecycle policy for this bucket to avoid unnecessary charges. The recommended expiration time is 24 hours to allow sufficient time to transfer all data to BigQuery.

Google Cloud requirements

To ensure a successful Amazon Redshift data warehouse migration, make sure you have met the following prerequisites on Google Cloud.

  1. Choose or create a Google Cloud project to store your migration data.

  2. Enable the BigQuery Data Transfer Service API.

    In the Google Cloud Console, click the Enable button on the BigQuery Data Transfer Service API page.

    Enable API

    BigQuery is automatically enabled in new projects. For an existing project, you may need to enable the BigQuery API. A green checkmark indicates that you've already enabled the API.

    Enabled API

  3. Create a BigQuery dataset to store your data. You do not need to create any tables.

  4. Allow pop-ups in your browser from bigquery.cloud.google.com so that you can view the permissions window when you set up the transfer. You must allow the BigQuery Data Transfer Service permission to manage your transfer.

Grant access to your Amazon Redshift cluster

Follow the instructions from Amazon to whitelist the following IP addresses. You can whitelist the IP addresses that correspond to your dataset's location, or you can whitelist all of the IP addresses in the table below. These Google-owned IP addresses are reserved for Amazon Redshift data migrations.

US
(us multi-region)		 Tokyo
(asia-northeast1)		 EU
(eu multi-region)		 London
(europe-west2)		 Australia
(australia-southeast1)
35.185.196.212
35.197.102.120
35.185.224.10
35.185.228.170
35.197.5.235
35.185.206.139
35.197.67.234
35.197.38.65
35.185.202.229
35.185.200.120		 34.85.11.246
34.85.30.58
34.85.8.125
34.85.38.59
34.85.31.67
34.85.36.143
34.85.32.222
34.85.18.128
34.85.23.202
34.85.35.192		 34.76.156.158
34.76.156.172
34.76.136.146
34.76.1.29
34.76.156.232
34.76.156.81
34.76.156.246
34.76.102.206
34.76.129.246
34.76.121.168		 35.189.119.113
35.189.101.107
35.189.69.131
35.197.205.93
35.189.121.178
35.189.121.41
35.189.85.30
35.197.195.192		 35.189.33.150
35.189.38.5
35.189.29.88
35.189.22.179
35.189.20.163
35.189.29.83
35.189.31.141
35.189.14.219

Grant access to your Amazon S3 bucket

You will need an S3 bucket to use as a staging area, for transferring the Amazon Redshift data to BigQuery. Detailed instructions from Amazon can be found here.

  1. We recommended you create a dedicated Amazon IAM user, and grant that user only Read access to Redshift and Read and Write access to S3. This can be achieved by applying the following existing policies:

    Redshift migration Amazon permissions

  2. Create an Amazon IAM user access key pair.

Optional: workload control with a separate migration queue

You can define an Amazon Redshift queue for migration purposes to limit and separate the resources used for migration. This migration queue can be configured with a max concurrency query count. You can then associate a certain migration user group with the queue, and use those credentials when setting up the migration to transfer data to BigQuery. The transfer service will only have access to the migration queue.

Setting up an Amazon Redshift migration

To set up an Amazon Redshift transfer:

Console

  1. Go to the BigQuery web UI in the Cloud Console.

    Go to the Cloud Console

  2. Click Transfers.

  3. Click Add Transfer.

  4. On the New Transfer page:

    • For Source, choose Migration: Amazon Redshift.
    • For Display name, enter a name for the transfer such as My migration. The display name can be any value that allows you to easily identify the transfer if you need to modify it later.

    • For Destination dataset, choose the appropriate dataset.

      New Amazon Redshift migration general

  5. Under Data Source Details, continue with specific details for your Amazon Redshift transfer.

    • For JDBC connection url for Amazon Redshift, provide the JDBC url to access your Amazon Redshift cluster.
    • For Username of your database, enter the username for the Amazon Redshift database you'd like to migrate.
    • For Password of your database, enter the database password.
    • For Access key ID and Secret access key, enter the access key pair you obtained from Grant access to your S3 bucket.
    • For Amazon S3 URI, enter the URI of the S3 bucket you'll use as a staging area.
    • For Amazon Redshift Schema, enter the Amazon Redshift Schema you're migrating.

    • For Table name patterns specify a name or a pattern for matching the table names in the Schema. You can use regular expressions to specify the pattern in the form: <table1Regex>;<table2Regex>. The pattern should follow Java regular expression syntax.

      New Amazon Redshift migration data source details

    • (Optional) In the Notification options section:

      • Click the toggle to enable email notifications. When you enable this option, the transfer administrator receives an email notification when a transfer run fails.

      • For Select a Pub/Sub topic, choose your topic name or click Create a topic. This option configures Pub/Sub run notifications for your transfer.

        Pub/Sub topic

  6. Click Save.

  7. The Cloud Console will display all the transfer setup details, including a Resource name for this transfer.

    Transfer confirmation

Classic UI

  1. Go to the classic BigQuery web UI.

    Go to the classic BigQuery web UI

  2. Click Transfers.

  3. Click Add Transfer.

  4. On the New Transfer page:

    • For Source, choose Migration: Amazon Redshift.
    • For Display name, enter a name for the transfer such as My Migration. The display name can be any value that allows you to easily identify the transfer if you need to modify it later.
    • For Destination dataset, choose the appropriate dataset.
    • For JDBC connection url for Amazon Redshift, provide the JDBC url to access your Amazon Redshift cluster.
    • For Username of your database, enter username for the Amazon Redshift database you'd like to migrate.
    • For Password of your database, enter the database password.
    • For Access key ID and Secret access key, Enter the access key pair you obtained from Grant access to your S3 bucket.
    • For Amazon S3 URI, enter the URI of S3 bucket you'll use as a staging area.
    • For Amazon Redshift Schema, enter the Amazon Redshift Schema you would like to migrate tables from.
    • For Table name patterns specify a name or pattern for matching the table names in the database schema. You can use regular expressions to specify the pattern, in the form: <table1Regex>;<table2Regex>. The pattern should follow Java regular expression syntax.

    New Amazon Redshift migration data source details

    • (Optional) Expand the Advanced section and configure run notifications for your transfer.

      • For Pub/Sub topic, enter your topic name, for example, projects/myproject/topics/mytopic.
      • Check Send email notifications to allow email notifications of transfer run failures.
      • Don't check Disabled when setting up a transfer. See Working with transfers to disable existing transfers.

      Pub/Sub topic

  5. Click Add.

  6. If prompted, click Allow to give the BigQuery Data Transfer Service permission to manage your transfer. You must allow browser pop-ups from bigquery.cloud.google.com to view the permissions window.

    Allow transfer

  7. The web UI will display all the transfer setup details, including a Resource name for this transfer.

    Transfer Confirmation

CLI

Enter the bq mk command and supply the transfer creation flag --transfer_config. The following flags are also required:

  • --project_id
  • --data_source
  • --target_dataset
  • --display_name
  • --params
bq mk \
--transfer_config \
--project_id=project_id \
--data_source=data_source \
--target_dataset=dataset \
--display_name=name \
--params='parameters'

Where:

  • project_id is your Google Cloud project ID. If --project_id isn't specified, the default project is used.
  • data_source is the data source: redshift.
  • dataset is the BigQuery target dataset for the transfer configuration.
  • name is the display name for the transfer configuration. The transfer name can be any value that allows you to easily identify the transfer if you need to modify it later.
  • parameters contains the parameters for the created transfer configuration in JSON format. For example: --params='{"param":"param_value"}'.

Parameters required for an Amazon Redshift transfer configuration are:

  • jdbc_url: The JDBC connection url is used to locate the Amazon Redshift cluster.
  • database_username: The username to access your database to unload specified tables.
  • database_password: The password used with the username to access your database to unload specified tables.
  • access_key_id: The access key ID to sign requests made to AWS.
  • secret_access_key: The secret access key used with the access key ID to sign requests made to AWS.
  • s3_bucket: The Amazon S3 URI beginning with "s3://" and specifying a prefix for temporary files to be used.
  • redshift_schema: The Amazon Redshift schema that contains all the tables to be migrated.
  • table_name_patterns: Table name patterns separated by a semicolon (;). The table pattern is a regular expression for table(s) to migrate. If not provided, all tables under the database schema will be migrated.

For example, the following command creates an Amazon Redshift transfer named My Transfer with a target dataset named mydataset and a project with the ID of google.com:myproject.

bq mk \
--transfer_config \
--project_id=myproject \
--data_source=redshift \
--target_dataset=mydataset \
--display_name='My Transfer' \
--params='{"jdbc_url":"jdbc:postgresql://test-example-instance.sample.us-west-1.redshift.amazonaws.com:5439/dbname","database_username":"my_username","database_password":"1234567890","access_key_id":"A1B2C3D4E5F6G7H8I9J0","secret_access_key":"1234567890123456789012345678901234567890","s3_bucket":"s3://bucket/prefix","redshift_schema":"public","table_name_patterns":"table_name"}'

API

Use the projects.locations.transferConfigs.create method and supply an instance of the TransferConfig resource.

Quotas and limits

BigQuery has a load quota of 15 TB, per load job, per table. Internally, Amazon Redshift compresses the table data, so the exported table size will be larger than the table size reported by Amazon Redshift. If you are planning to migrate a table larger than 15 TB, please reach out to bq-dts-support@google.com first.

Note that costs can be incurred outside of Google by using this service. Please review the Amazon Redshift and Amazon S3 pricing pages for details.

Because of Amazon S3's consistency model, it's possible for some files to not be included in the transfer to BigQuery.

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