zeppelin/docs/interpreter/bigquery.md

layout	title	description	group
page	BigQuery Interpreter for Apache Zeppelin	BigQuery is a highly scalable no-ops data warehouse in the Google Cloud Platform.	interpreter

{% include JB/setup %}

BigQuery Interpreter for Apache Zeppelin

Overview

BigQuery is a highly scalable no-ops data warehouse in the Google Cloud Platform. Querying massive datasets can be time consuming and expensive without the right hardware and infrastructure. Google BigQuery solves this problem by enabling super-fast SQL queries against append-only tables using the processing power of Google's infrastructure. Simply move your data into BigQuery and let us handle the hard work. You can control access to both the project and your data based on your business needs, such as giving others the ability to view or query your data.

Configuration

Name	Default Value	Description
zeppelin.bigquery.project_id		Google Project Id
zeppelin.bigquery.wait_time	5000	Query Timeout in Milliseconds
zeppelin.bigquery.max_no_of_rows	100000	Max result set size

BigQuery API

Zeppelin is built against BigQuery API version v2-rev265-1.21.0 - API Javadocs

Enabling the BigQuery Interpreter

In a notebook, to enable the BigQuery interpreter, click the Gear icon and select bigquery.

Setup service account credentials

In order to run BigQuery interpreter outside of Google Cloud Engine you need to provide authentication credentials, by following this instructions:

• Go to the API Console Credentials page
• From the project drop-down, select your project.
• On the Credentials page, select the Create credentials drop-down, then select Service account key.
• From the Service account drop-down, select an existing service account or create a new one.
• For Key type, select the JSON key option, then select Create. The file automatically downloads to your computer.
• Put the *.json file you just downloaded in a directory of your choosing. This directory must be private (you can't let anyone get access to this), but accessible to your Zeppelin instance.
• Set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the path of the JSON file downloaded.
  • either though GUI: in interpreter configuration page property names in CAPITAL_CASE set up env vars
  • or though zeppelin-env.sh: just add it to the end of the file.

Using the BigQuery Interpreter

In a paragraph, use %bigquery.sql to select the BigQuery interpreter and then input SQL statements against your datasets stored in BigQuery. You can use BigQuery SQL Reference to build your own SQL.

For Example, SQL to query for top 10 departure delays across airports using the flights public dataset

%bigquery.sql
SELECT departure_airport,count(case when departure_delay>0 then 1 else 0 end) as no_of_delays 
FROM [bigquery-samples:airline_ontime_data.flights] 
group by departure_airport 
order by 2 desc 
limit 10

Another Example, SQL to query for most commonly used java packages from the github data hosted in BigQuery

%bigquery.sql
SELECT
  package,
  COUNT(*) count
FROM (
  SELECT
    REGEXP_EXTRACT(line, r' ([a-z0-9\._]*)\.') package,
    id
  FROM (
    SELECT
      SPLIT(content, '\n') line,
      id
    FROM
      [bigquery-public-data:github_repos.sample_contents]
    WHERE
      content CONTAINS 'import'
      AND sample_path LIKE '%.java'
    HAVING
      LEFT(line, 6)='import' )
  GROUP BY
    package,
    id )
GROUP BY
  1
ORDER BY
  count DESC
LIMIT
  40

Technical description

For in-depth technical details on current implementation please refer to bigquery/README.md.