Rockset makes it simple to develop serverless microservices, knowledge APIs, and data-driven functions. This video demo exhibits an instance of what is attainable with Rockset. For this train, we’ll construct a serverless microservice to find the inventory symbols with probably the most mentions on Twitter.

Ingest

Our Twitter stream comes from Amazon Kinesis and is repeatedly ingested into Rockset. It is a easy course of to arrange a reside integration between Rockset and Kinesis from the Rockset console. Seek advice from our step-by-step information for extra particulars, together with data on establishing the Twitter Kinesis stream.

We additionally wish to mix the inventory mentions from Twitter with details about these shares from Nasdaq. This data comes from a file in Amazon S3 and is ingested right into a second Rockset assortment.


Question

Rockset robotically infers the schema for the Twitter JSON knowledge within the twitter-firehose assortment. We have not carried out any transformation on the information, however we will instantly run SQL queries on it. Analyzing the outcomes of our SQL question, observe how the Twitter knowledge is organized in a number of ranges of nesting and arrays.

In our instance, we’re particularly targeted on tweets that comprise inventory mentions, which we discover beneath the symbols arrays within the entities subject. We steadily discover the information and construct out our SQL question, becoming a member of tweet knowledge with the Nasdaq firm data within the tickers assortment, to return the preferred shares in our knowledge set together with some descriptive data about every inventory.

-- unnest tweets with inventory ticker symbols from the previous 1 day
WITH stock_tweets AS
      (SELECT t.consumer.title, t.textual content, higher(sym.textual content) AS ticker
       FROM   "twitter-firehose" AS t, unnest(t.entities.symbols) AS sym
       WHERE  t.entities.symbols[1] isn't null
         AND  t._event_time > current_timestamp() - INTERVAL 1 day),

-- mixture inventory ticker image tweet occurrences 
    top_stock_tweets AS
      (SELECT ticker, rely(*) AS tweet_count
       FROM   stock_tweets
       GROUP BY ticker),

-- be part of inventory ticker image in tweets with NASDAQ firm listing knowledge
    stock_info_with_tweets AS 
      (SELECT top_stock_tweets.ticker, top_stock_tweets.tweet_count,
              tickers.Title, tickers.Trade, tickers.MarketCap
       FROM top_stock_tweets JOIN tickers
         ON top_stock_tweets.ticker = tickers.Image)

-- present prime 10 most tweeted inventory ticker symbols together with firm data
SELECT * 
FROM   stock_info_with_tweets t
ORDER BY t.tweet_count DESC
LIMIT 10

Construct

Rockset lets you export your SQL question and embed it as is into your code.

For our demo, we have constructed a Python-based serverless API, utilizing AWS Lambda, that returns the inventory symbols occurring most frequently in tweets. (Different language shoppers, together with Node.js, Go, and Java, are additionally accessible.)

Embedded content material: https://gist.github.com/kleong/8cd66d6e206077c7a7f72b51ddc874ee

As soon as arrange, we will serve reside queries on uncooked, real-time Twitter knowledge. In these outcomes, the corporate Title, Trade, and MarketCap come from the Nasdaq firm data.

We will additionally construct a rudimentary app that calls the API and shows the inventory symbols with probably the most mentions on Twitter for customizable time intervals.

We have offered the code for the Construct steps—the Python Lambda perform and the dashboard—in our recipes repository, so you’ll be able to lengthen or modify this instance on your wants.

There’s quite a bit happening on this instance. We have taken uncooked JSON and CSV from streaming and static sources, written SQL queries becoming a member of the 2 knowledge units, used our ultimate SQL question to create a serverless API, and referred to as the API by our app. You may view extra element on how we applied this serverless microservice within the video embedded above. Hopefully this demo will spur your creativeness as you take into account what you’ll be able to construct on Rockset.