Integrating a Low-Latency Distributed Database with Event Streaming
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When building distributed data systems architectures you need to pair database systems that can keep up with the rate and volume of the event streams you generate. Discover from Raouf Chebri, Developer Advocate for ScyllaDB, why ScyllaDB’s NoSQL database serves as a perfect complement to event streaming technologies like Apache Pulsar.
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Integrating a Low-Latency Distributed Database with Event Streaming
- 1. Integrating a Low-Latency Distributed Database with Event Streaming Developer Advocate at ScyllaDB Raouf Chebri
- 2. Outline 2 1. ScyllaDB 2. Change Data Capture 3. Connectors 4. Pulsar Sink Connector
- 3. ScyllaDB 1
- 4. Cluster 4
- 5. Multi-datacenter replication 5 ALTER KEYSPACE ks WITH REPLICATION = {'class': 'NetworkTopologyStrategy', 'DC1':3, 'DC2':3};
- 7. 7
- 8. Availability vs Consistency 8 Insert Select Success Data
- 9. Availability vs Consistency 9 Insert Select Success Data
- 11. Change Data Capture 11 Update Table t pk ck v 0 0 1 Table t pk ck v 0 0 3 change at 2020-01-29 14:37:32: UPDATE ks.t SET v = 3 WHERE pk = 0 AND ck = 0;
- 15. Connectors 3
- 16. Evolution of System Architecture 16 frontend backend database
- 17. Evolution of System Architecture 17
- 18. Evolution of System Architecture 18
- 19. Connectors 19 “The code is a liability, not an asset.” Matt Coulter
- 24. Recap 24 1. ScyllaDB 2. Change Data Capture 3. Connectors 4. Pulsar + ScyllaDB
- 25. Keep in touch! Raouf Chebri Developer Advocate ScyllaDB developers@scylladb.com @raoufscylladb
Editor's Notes
- Intro self THANKS for attending the Distributed Data Systems Masterclass!
- So maybe, this is a good time, before we dive into the demo, to take a moment and explain what is ScyllaDB and why we’re using it.
- Here is an illustration of how data is replicated across a cluster. The query is parsed and processed by a node then replicated in other nodes for high availability. We’ve seen this representation of a cluster in a previous slide and you might also have seen this architecture before if you’re familiar with distributed systems and other databases such as DynamoDB, CosmosDB and Apache Cassandra. In fact, ScyllaDB is modeled after Apache Cassandra and is API compatible both Cassandra and DynamoDB. But what makes ScyllaDB a lot faster than the competition and standout is two things: It’s implemented in C++ and not Java And, its shard-per-code architecture.
- Let’s talk briefly about what shard-per-core means. Shard-per-core means that every CPU of your machine is responsible of a portion of the data. So imagine the following: when you send a query to the database, the partition key determines which node in the cluster will process the query. With shard-awareness, it also determines which core will process the query. NEXT
- Let’s talk first a little bit about Connectors.
- built-in connectors helps you avoid all those bug-prone and lengthy procedures. So let’s say you’re using a streaming platform such as Kafka or Pulsar. Connectors help you import and export data from some of the most commonly used data systems with just a simple configuration. Connectors to import data into the steaming platform are called Sources. Connectors to export data from the streaming platform. We call those Sinks.
- We don’t have time to cover this today, but If you’re interested in knowing more about ScyllaDB, you should check-out Scylla University or actually attend Scylla University LIVE in July. Alright! We said ScyllaDB and Pulsar are both very fast! So let’s now get to the demo!
- Cheers to you for keeping afloat with the current pace of technology and trying to always improve
- Let’s talk first a little bit about Connectors.
- Life used to be simple Your application became popular
- Scale up Virtual machines Worried about the data: multiple instances, Geo-replication Worry about latency because of geographical locations: Caching and CDN
- You heard of containers and its advantages You heard of microservices Added an event-bus
- Code is a liability, not an asset I actually stole this quote from Matt Coulter, who is AWS Serverless Hero. I tried to trace the quote back to its original author but I couldn’t find them. So please ping me on twitter or send me an email if you know more about that. But basically, code is a liability. The more code you write, the more bugs you write and the more you fix and maintain.
- Summary: Streaming Systems serve as data pipelines and help take it from a place to another
- In this demo, we’ll spin-up a ScyllaDB instance Configure Pulsar to use ScyllaDB as a Sink And walk through the code to set up a producer I already have pulsar running using docker. I need an instance of Scylla as well. Here is the command to run a cluster locally. I’m using docker to run a ScyllaDB container on my machine, but sometimes I don’t like to run many things on my machine, and also to avoid the “it worked on my machine” kinda issues I like to use Scylla Cloud, that you can try for free. In the dashboard, I can create a cluster and deploy it on AWS or GCP in the geographical location that makes the most sense for your application. The closer the better your latency. I’m going to skip this part as I already have a cluster ready for the demo. On my cluster, I get information about my nodes and if they are running. I see that everything is okay. In the connect tab, I have instructions to connect to the cluster. I can use any of the languages I like and also connect using the command line and CQLSH. CQL is the Cassandra Query Language, which if you are familiar with SQL, should be very intuitive. So I’m going to connect to the cluster and see what’s in there. Here are the keyspaces that I have. Keyspace is the logical location of where your data is stored where you also define things like Replication Strategy and Replication factor. Let me use pulsar_test_keyspace and have a look at the tables. And you can see I created a pulsar_test_table that has a key and a col. So let’s configure the sink. In pulsar, I created a config file sink-config.json where I specify the keyspace, table and topic. Now I ready to create the sink using the following command. You can see I have tenant, namespace, the sink-type and the config file as input. Now that I successfully create the sink, let’s test it out. I have a simple python script
- The reason you’d consider using ScyllaDB is because latency matters at scale. This is a chart from the Kafka vs Pulsar benchmark, that you can find on StreamNative’s website and that I highly encourage you to read. At p99 and any anything beyond that is where it gets interesting. With 1KB size messages, we clearly see Pulsar (here in blue) consistently operate at a few milliseconds or even microseconds. The database you choose can easily become a bottleneck to your system. That’s why you need a system that can digest that huge in-flux of data very quickly. ScyllaDB is designed to do just that. It’s designed to handle millions of operations per second with sub-milliseconds p99. NEXT
- built-in connectors helps you avoid all those bug-prone and lengthy procedures. So let’s say you’re using a streaming platform such as Kafka or Pulsar. Connectors help you import and export data from some of the most commonly used data systems with just a simple configuration. Connectors to import data into the steaming platform are called Sources. Connectors to export data from the streaming platform. We call those Sinks.