We dwell in a world the place numerous techniques—social networks, monitoring, inventory exchanges, web sites, IoT gadgets—all repeatedly generate volumes of information within the type of occasions, captured in techniques like Apache Kafka and Amazon Kinesis. One can carry out all kinds of analyses, like aggregations, filtering, or sampling, on these occasion streams, both on the file degree or over sliding time home windows. On this weblog, I’ll present how Rockset can serve a dwell dashboard, which surfaces analytics on real-time Twitter knowledge ingested into Rockset from a Kinesis stream.

Establishing a Kinesis Stream

The Python code snippet under exhibits easy methods to create a Kinesis stream programmatically. This may also be achieved via the AWS Console or the AWS CLI.

import boto3
kinesis = boto3.consumer('kinesis') # requires AWS credentials to be current in env
kinesis.create_stream(StreamName="twitter-stream", ShardCount=5)

Writing Tweets to Kinesis

Right here, I will likely be utilizing the Tweepy module to fetch tweets via a streaming search API. This API permits me to specify an inventory of phrases that I wish to embody in my search (e.g. “music”, “fb”, “apple”). You want to have a Twitter developer account with the intention to get entry to the Twitter Streaming API. Right here, I’ve a StreamListener, which is registered to be notified on a tweet arrival. Upon receiving a tweet, it writes the tweet knowledge to one of many 5 random shards of the Kinesis stream.

# twitter api credentials
access_token=...
access_token_secret=...
consumer_key=...
consumer_secret=...

class TweetListener(StreamListener):
    def __init__(self, stream_name):
        self.kinesis = boto3.consumer('kinesis')
        self.stream_name = stream_name

    def on_data(self, knowledge):
        file = {}
        file['Data'] = knowledge
        file['PartitionKey'] = ''.be part of(random.alternative(chars) for _ in vary(measurement))
        self.kinesis.put_records(Data=[record], StreamName=self.stream_name)

auth=OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_token_secret)

stream=Stream(auth, TweetListener("twitter-stream"))
search_terms=["music", "facebook", "apple"]
stream.filter(monitor=search_terms)

Connecting Kinesis to Rockset

The next snippet exhibits easy methods to create a set in Rockset, backed by a Kinesis stream. Be aware: You want to create an Integration (an object that represents your AWS credentials) and arrange related permissions on the Kinesis stream, which permits Rockset to carry out sure learn operations on that stream.

from rockset import Shopper, Q, F
rs=Shopper(api_key=...)

aws_integration=rs.Integration.retrieve(...)
sources=[
    rs.Source.kinesis(
        stream_name="twitter-stream",
        integration=aws_integration)]
twitter_kinesis_demo=rs.Assortment.create("twitter-kinesis-demo", sources=sources)

Alternatively, collections may also be created from the Rockset console, as proven under.

Constructing the Stay Dashboard

Now that I’ve a producer writing tweets to a Kinesis stream and a set to ingest them into Rockset, I can construct a dashboard on high of this assortment. My dashboard has two views.

Tweets View

The primary view shows analytics on all of the tweets coming into Rockset and has 3 panels, every of which makes its personal question to Rockset.

Stay Tweets

The Stay Tweets panel continuously refreshes to point out the newest tweets showing within the assortment. A question is made at a hard and fast refresh interval to fetch tweets that have been tweeted within the final minute. Right here, I’m choosing required fields to point out on the feed and filtering out tweets older than a minute.

SELECT t.timestamp_ms,
   t.created_at AS created_at,
   t.textual content AS textual content,
   t.consumer.screen_name AS screen_name
FROM "twitter-kinesis-demo" t
WHERE CAST(timestamp_ms AS INT) > UNIX_MILLIS(current_timestamp() - minutes(1))
ORDER BY timestamp_ms DESC
LIMIT 100;

Prime Hashtags

The Prime Hashtags panel exhibits trending hashtags, which have been present in most variety of tweets within the final hour, together with the related tweet rely. On this question, all hashtags showing within the final one hour are filtered into a brief relation latest_hashtags. Utilizing a WITH clause, latest_hashtags is used it the principle question, the place we group by all of the hashtags and order by tweet_count to acquire the trending hashtags.

WITH lastest_hashtags AS
  (SELECT decrease(ht.textual content) AS hashtag
   FROM "twitter-kinesis-demo" t,
        unnest(t.extended_tweet.entities.hashtags) ht
   WHERE CAST(t.timestamp_ms AS INT) > UNIX_MILLIS(current_timestamp() - hours(1)))
SELECT rely(hashtag) AS tweet_count,
       hashtag
FROM latest_hashtags
GROUP BY hashtag
ORDER BY tweet_count DESC
LIMIT 10;

Incoming Tweets

The final panel is a chart which exhibits the speed at which customers are tweeting. We acquire knowledge factors for the variety of incoming tweets each 2 seconds and plot them in a chart.

SELECT rely(*)
FROM "twitter-kinesis-demo"
WHERE solid(timestamp_ms AS INT) > unix_millis(current_timestamp() - seconds(2));

Hashtags View

The second view shows analytics on tweets with a selected hashtag and likewise has 3 panels: Stay Tweets, Associated Hashtags, and Influencers. Every panel within the dashboard makes a question to Rockset. That is similar to the primary dashboard view however narrows the analytics to a particular hashtag of curiosity.

Influencers

As we have now narrowed our evaluation to a single hashtag, it could be fascinating to see who essentially the most influential customers are round this subject. For this, we outline influencers as customers with the best variety of followers who’re tweeting the hashtag of curiosity.

SELECT t.consumer.screen_name,
       t.consumer.followers_count AS fc
FROM "twitter-kinesis-demo" t
WHERE 'music' IN
    (SELECT hashtags.textual content
     FROM unnest(t.entities.hashtags) hashtags)
GROUP BY (t.consumer.screen_name,
          t.consumer.followers_count)
ORDER BY t.consumer.followers_count DESC
LIMIT 5;

Associated Hashtags

This part is considerably just like the Prime Hashtags panel we noticed within the Tweets view of the dashboard. It exhibits the hashtags that co-occur most frequently together with our hashtag of curiosity.

SELECT hashtags.textual content as hashtag,
     rely(*) AS occurence_count
FROM "twitter-kinesis-demo" t,
    unnest(t.entites.hashtags) hashtags
WHERE 'music' IN
    (SELECT ht.textual content
     FROM unnest(t.entities.hashtags) ht)
  AND hashtags.textual content != 'music'
GROUP BY hashtags.textual content
ORDER BY occurence_count DESC
LIMIT 10;

Stay Tweets

The Stay Tweets panel is similar to one we noticed within the Tweets view of the dashboard. The one distinction is a brand new filter is utilized with the intention to choose these tweets which include our hashtag of curiosity. I already used this filter for the opposite two panels within the Hashtags view.

The place to Go from Right here

Whereas I created this instance dwell dashboard as an instance how real-time analytics might be carried out on knowledge from Kinesis streams, Rockset helps Kafka, as a streaming supply, and commonplace visualization instruments, like Tableau, Apache Superset, Redash, and Grafana, as nicely.

You may seek advice from the complete supply code for this instance right here, in case you are all in favour of constructing on streaming knowledge utilizing Rockset and Kinesis. Comfortable constructing!