Use Your Data in LLMs With the Vector Database You Already Have: The New Stack
Open source vector databases are among the top options out there for AI development, including some you may already be familiar with or even have on hand.
Vector databases allow you to enhance your LLM models with data from your internal data stores. Prompting the LLM with local, factual knowledge can allow you to get responses tailored to what your organization already knows about the situation. This reduces “AI hallucination” and improves relevance.
You can even ask the LLM to add references to the original data it used in its answer so you can check yourself. No doubt vendors have reached out with proprietary vector database solutions, advertised as a “magic wand” enabling you to assuage any AI hallucination concerns.
But, ready for some good news?
If you’re already using Apache Cassandra 5.0, OpenSearch or PostgreSQL, your vector database success is already primed. That’s right: There’s no need for costly proprietary vector database offerings. If you’re not (yet) using these free and fully open source database technologies, your generative AI aspirations are a good time to migrate — they are all enterprise-ready and avoid the pitfalls of proprietary systems.
For many enterprises, these open source vector databases are the most direct route to implementing LLMs — and possibly leveraging retrieval augmented generation (RAG) — that deliver tailored and factual AI experiences.
Vector databases store embedding vectors, which are lists of numbers representing spatial coordinates corresponding to pieces of data. Related data will have closer coordinates, allowing LLMs to make sense of complex and unstructured datasets for features such as generative AI responses and search capabilities.
RAG, a process skyrocketing in popularity, involves using a vector database to translate the words in an enterprise’s documents into embeddings to provide highly efficient and accurate querying of that documentation via LLMs.
Let’s look closer at what each open source technology brings to the vector database discussion:
Apache Cassandra 5.0 Offers Native Vector Indexing
With its latest version (currently in preview), Apache Cassandra has added to its reputation as an especially highly available and scalable open source database by including everything that enterprises developing AI applications require.
Cassandra 5.0 adds native vector indexing and vector search, as well as a new vector data type for embedding vector storage and retrieval. The new version has also added specific Cassandra Query Language (CQL) functions that enable enterprises to easily use Cassandra as a vector database. These additions make Cassandra 5.0 a smart open source choice for supporting AI workloads and executing enterprise strategies around managing intelligent data.
OpenSearch Provides a Combination of Benefits
Like Cassandra, OpenSearch is another highly popular open source solution, one that many folks on the lookout for a vector database happen to already be using. OpenSearch offers a one-stop shop for search, analytics and vector database capabilities, while also providing exceptional nearest-neighbor search capabilities that support vector, lexical, and hybrid search and analytics.
With OpenSearch, teams can put the pedal down on developing AI applications, counting on the database to deliver the stability, high availability and minimal latency it’s known for, along with the scalability to account for vectors into the tens of billions. Whether developing a recommendation engine, generative AI agent or any other solution where the accuracy of results is crucial, those using OpenSearch to leverage vector embeddings and stamp out hallucinations won’t be disappointed.
The pgvector Extension Makes Postgres a Powerful Vector Store
Enterprises are no strangers to Postgres, which ranks among the most used databases in the world. Given that the database only needs the pgvector extension to become a particularly performant vector database, countless organizations are just a simple deployment away from harnessing an ideal infrastructure for handling their intelligent data.
pgvector is especially well-suited to provide exact nearest-neighbor search, approximate nearest-neighbor search and distance-based embedding search, and at using cosine distance (as recommended by OpenAI), L2 distance and inner product to recognize semantic similarities. Efficiency with those capabilities makes pgvector a powerful and proven open source option for training accurate LLMs and RAG implementations, while positioning teams to deliver trustworthy AI applications they can be proud of.
Was the Answer to Your AI Challenges in Front of You All Along?
The solution to tailored LLM responses isn’t investing in some expensive proprietary vector database and then trying to dodge the very real risks of vendor lock-in or a bad fit. At least it doesn’t have to be. Recognizing that available open source vector databases are among the top options out there for AI development — including some you may already be familiar with or even have on hand — should be a very welcome revelation.
The post Use Your Data in LLMs With the Vector Database You Already Have: The New Stack appeared first on Instaclustr.
easy-cass-lab v5 released
I’ve got some fun news to start the week off for users of easy-cass-lab: I’ve just released version 5. There are a number of nice improvements and bug fixes in here that should make it more enjoyable, more useful, and lay groundwork for some future enhancements.
- When the cluster starts, we wait for the storage service to
reach NORMAL state, then move to the next node. This is in contrast
to the previous behavior where we waited for 2 minutes after
starting a node. This queries JMX directly using Swiss Java Knife
and is more reliable than the 2-minute method. Please see
packer/bin-cassandra/wait-for-up-normalto read through the implementation. - Trunk now works correctly. Unfortunately, AxonOps doesn’t support trunk (5.1) yet, and using the agent was causing a startup error. You can test trunk out, but for now the AxonOps integration is disabled.
- Added a new repl mode. This saves keystrokes and provides some
auto-complete functionality and keeps SSH connections open. If
you’re going to do a lot of work with ECL this will help you be a
little more efficient. You can try this out with
ecl repl. - Power user feature: Initial support for profiles in AWS regions
other than
us-west-2. We only provide AMIs forus-west-2, but you can now set up a profile in an alternate region, and build the required AMIs usingeasy-cass-lab build-image. This feature is still under development and requires using aneasy-cass-labbuild from source. Credit to Jordan West for contributing this work. - Power user feature: Support for multiple profiles. Setting the
EASY_CASS_LAB_PROFILEenvironment variable allows you to configure alternate profiles. This is handy if you want to use multiple regions or have multiple organizations. - The project now uses Kotlin instead of Groovy for Gradle configuration.
- Updated Gradle to 8.9.
- When using the list command, don’t show the alias “current”.
- Project cleanup, remove old unused pssh, cassandra build, and async profiler subprojects.
The release has been released to the project’s GitHub page and to homebrew. The project is largely driven by my own consulting needs and for my training. If you’re looking to have some features prioritized please reach out, and we can discuss a consulting engagement.
Who Did What to That and When? Exploring the User Actions Feature
NetApp recently released the user actions feature on the Instaclustr Managed Platform, allowing customers to search for user actions recorded against their accounts and organizations. We record over 100 different types of actions, with detailed descriptions of what was done, by whom, to what, and at what time.
This provides customers with visibility into the actions users are performing on their linked accounts. NetApp has always collected this information in line with our security and compliance policies, but now, all important changes to your managed cluster resources have self-service access from the Console and the APIs.
In the past, this information was accessible only through support tickets when important questions such as “Who deleted my cluster?” and “When was the firewall rule removed from my cluster?” needed answers. This feature adds more self-discoverability of what your users are doing and what our support staff are doing to keep your clusters healthy.
This blog post provides a detailed walkthrough of this new feature at a moderate level of technical detail, with the hope of encouraging you to explore and better find the actions you are looking for.
For this blog, I’ve created two Apache Cassandra® clusters in one account and performed some actions on each. I’ve also created an organization linked to this account and performed some actions on that. This will allow a full example UI to be shown and demonstrate the type of “stories” that can emerge from typical operations via user actions.
Introducing Global Directory
During development, we decided to consolidate the other global account pages into a new centralized location, which we are calling the “Directory”.
This Directory provides you with the consolidated view of all organizations and accounts that you have access to, collecting global searches and account functions into a view that does not have a “selected cluster” context (i.e., global). For more information on how Organizations, Accounts and Clusters relate to each other, check out this blog.
Organizations serve as an efficient method to consolidate all associated accounts into a single unified, easily accessible location. They introduce an extra layer to the permission model, facilitating the management and sharing of information such as contact and billing details. They also streamline the process of Single Sign-On (SSO) and account creation.
Let’s log in and click on the new button:
This will take us to the new directory landing page:
Here, you will find two types of global searches: accounts and user actions, as well as account creation. Selecting the new “User Actions” item will take us to the new page. You can also navigate to these directory pages directly from the top right ‘folder’ menu:
User Action Search Page: Walkthrough
This is the new page we land on if we choose to search for user actions:
When you first enter, it finds the last page of actions that happened in the accounts and organizations you have access to. It will show both organization and account actions on a single consolidated page, even though they are slightly different in nature.
*Note: The accessible accounts and organisations are defined as those you are linked to as
CLUSTER_ADMIN
or
OWNER
*TIP: If you don’t want an account user to see user actions, give the
READ_ONLY
access.
You may notice a brief progress bar display as the actions are retrieved. At the time of writing, we have recorded nearly 100 million actions made by our customers over a 6-month period.
From here, you can increase the number of actions shown on each page and page through the results. Sorting is not currently supported on the actions table, but it is something we will be looking to add in the future. For each action found, the table will display:
- Action: What happened to your account (or organization)? There are over 100 tracked kinds of actions recorded.
- Domain: The specific account or organization name of the action targeted.
- Description: An expanded description of what happened, using context captured at the time of action. Important values are highlighted between square brackets, and the copy button will copy the first one into the clipboard.
- User: The user who
performed the action, typically using the console/
APIs or
Terraform
provider, but
it can also be triggered by “Instaclustr
Support” using our
admin tools.
- For those actions marked with user “Instaclustr Support”, please reach out to support for more information about those actions we’ve taken on your behalf or visit https://support.instaclustr.com/hc/en-us.
- Local time: The action time from your local web browser’s perspective.
Additionally, for those who prefer programmatic access, the user action feature is fully accessible via our APIs, allowing for automation and integration into your existing workflows. Please visit our API documentation page here for more details.
Basic (super-search) Mode
Let’s say we only care about the “LeagueOfNations” organization domain; we can type ‘League’ and then click Search:
The name patterns are simple partial string patterns we look for as being ’contained’ within the name, such as ”Car” in ”Carlton”. These are case insensitive. They are not (yet!) general regular expressions.
Advanced “find a needle” Search Mode
Sometimes, searching by names is not precise enough; you may want to provide more detailed search criteria, such as time ranges or narrowing down to specific clusters or kinds of actions. Expanding the “Advanced Search” section will switch the page to a more advanced search criteria form, disabling the basic search area and its criteria.
Let’s say we only want to see the “Link Account” actions over the last week:
We select it from the actions multi-chip selector using the cursor (we could also type it and allow autocomplete to kick in). Hitting search will give you your needle time to go chase that Carl guy down and ask why he linked that darn account:
The available criteria fields are as follows (additive in nature):
- Action: the kinds of actions, with a bracketed count of their frequency over the current criteria; if empty, all are included.
- Account: The account name of interest OR its UUID can be useful to narrow the matches to only a specific account. It’s also useful when user, organization, and account names share string patterns, which makes the super-search less precise.
- Organization: the organization name of interest or its UUID.
- User: the user who performed the action.
- Description: matches against the value of an expanded description variable. This is useful because most actions mention the ‘target’ of the action, such as cluster-id, in the expanded description.
- Starting At: match actions starting from this time cannot be older than 12 months ago.
- Ending At: match actions up until this time.
Bonus Feature: Cluster Actions
While it’s nice to have this new search page, we wanted to build a higher-order question on top of it: What has happened to my cluster?
The answer can be found on the details tab of each cluster. When clicked on, it will take you directly to the user actions page with appropriate criteria to answer the question.
* TIP: we currently support entry into this view with a
descriptionFormat queryParam
allowing you to save bookmarks to particular action ‘targets’. Further
queryParams
may be supported in the future for the remaining criteria: https://console2.instaclustr.com/global/searches/user-action?descriptionContextPattern=acde7535-3288-48fa-be64-0f7afe4641b3
Clicking this provides you the answer:
Future Thoughts
There are some future capabilities we will look to add, including the ability to subscribe to webhooks that trigger on some criteria. We would also like to add the ability to generate reports against a criterion or to run such things regularly and send them via email. Let us know what other feature improvements you would like to see!
Conclusion
This new capability allows customers to search for user actions directly without contacting support. It also provides improved visibility and auditing of what’s been changing on their clusters and who’s been making those changes. We hope you found this interesting and welcome any feedback for “higher-order” types of searches you’d like to see built on top of this new feature. What kind of common questions about user actions can you think of?
If you have any questions about this feature, please contact Instaclustr Support at any time. If you are not a current Instaclustr customer and you’re interested to learn more, register for a free trial and spin up your first cluster for free!
The post Who Did What to That and When? Exploring the User Actions Feature appeared first on Instaclustr.
easy-cass-lab updated with Cassandra 5.0 RC-1 Support
I’m excited to announce that the latest version of easy-cass-lab now supports Cassandra 5.0 RC-1, which was just made available last week! This update marks a significant milestone, providing users with the ability to test and experiment with the newest Cassandra 5.0 features in a simplified manner. This post will walk you through how to set up a cluster, SSH in, and run your first stress test.
For those new to easy-cass-lab, it’s a tool designed to streamline the setup and management of Cassandra clusters in AWS, making it accessible for both new and experienced users. Whether you’re running tests, developing new features, or just exploring Cassandra, easy-cass-lab is your go-to tool.
easy-cass-lab now available in Homebrew
I’m happy to share some exciting news for all Cassandra enthusiasts! My open source project, easy-cass-lab, is now installable via a homebrew tap. This powerful tool is designed to make testing any major version of Cassandra (or even builds that haven’t been released yet) a breeze, using AWS. A big thank-you to Jordan West who took the time to make this happen!
What is easy-cass-lab?
easy-cass-lab is a versatile testing tool for Apache Cassandra. Whether you’re dealing with the latest stable releases or experimenting with unreleased builds, easy-cass-lab provides a seamless way to test and validate your applications. With easy-cass-lab, you can ensure compatibility and performance across different Cassandra versions, making it an essential tool for developers and system administrators. easy-cass-lab is used extensively for my consulting engagements, my training program, and to evaluate performance patches destined for open source Cassandra. Here are a few examples:
Cassandra Training Signups For July and August Are Open!
I’m pleased to announce that I’ve opened training signups for Operator Excellence to the public for July and August. If you’re interested in stepping up your game as a Cassandra operator, this course is for you. Head over to the training page to find out more and sign up for the course.
Streaming My Sessions With Cassandra 5.0
As a long time participant with the Cassandra project, I’ve witnessed firsthand the evolution of this incredible database. From its early days to the present, our journey has been marked by continuous innovation, challenges, and a relentless pursuit of excellence. I’m thrilled to share that I’ll be streaming several working sessions over the next several weeks as I evaluate the latest builds and test out new features as we move toward the 5.0 release.
Streaming Cassandra Workloads and Experiments
Streaming
In the world of software engineering, especially within the realm of distributed systems, continuous learning and experimentation are not just beneficial; they’re essential. As a software engineer with a focus on distributed systems, particularly Apache Cassandra, I’ve taken this ethos to heart. My journey has led me to not only explore the intricacies of Cassandra’s distributed architecture but also to share my experiences and findings with a broader audience. This is why my YouTube channel has become an active platform where I stream at least once a week, engaging with viewers through coding sessions, trying new approaches, and benchmarking different Cassandra workloads.
Live Streaming On Tuesdays
As I promised in December, I redid my presentation from the Cassandra Summit 2023 on a live stream. You can check it out at the bottom of this post.
Going forward, I’ll be live-streaming on Tuesdays at 10AM Pacific on my YouTube channel.
Next week I’ll be taking a look at tlp-stress, which is used by the teams at some of the biggest Cassandra deployments in the world to benchmark their clusters. You can find that here.
Cassandra Summit Recap: Performance Tuning and Cassandra Training
Hello, friends in the Apache Cassandra community!
I recently had the pleasure of speaking at the Cassandra Summit in San Jose. Unfortunately, we ran into an issue with my screen refusing to cooperate with the projector, so my slides were pretty distorted and hard to read. While the talk is online, I think it would be better to have a version with the right slides as well as a little more time. I’ve decided to redo the entire talk via a live stream on YouTube. I’m scheduling this for 10am PST on Wednesday, January 17 on my YouTube channel. My original talk was done in 30 minute slot, this will be a full hour, giving plenty of time for Q&A.
Cassandra Summit, YouTube, and a Mailing List
I am thrilled to share some significant updates and exciting plans with my readers and the Cassandra community. As we draw closer to the end of the year, I’m preparing for an important speaking engagement and mapping out a year ahead filled with engaging and informative activities.
Cassandra Summit Presentation: Mastering Performance Tuning
I am honored to announce that I will be speaking at the upcoming Cassandra Summit. My talk, titled “Cassandra Performance Tuning Like You’ve Been Doing It for Ten Years,” is scheduled for December 13th, from 4:10 pm to 4:40 pm. This session aims to equip attendees with advanced insights and practical skills for optimizing Cassandra’s performance, drawing from a decade’s worth of experience in the field. Whether you’re new to Cassandra or a seasoned user, this talk will provide valuable insights to enhance your database management skills.
Uncover Cassandra's Throughput Boundaries with the New Adaptive Scheduler in tlp-stress
Introduction
Apache Cassandra remains the preferred choice for organizations seeking a massively scalable NoSQL database. To guarantee predictable performance, Cassandra administrators and developers rely on benchmarking tools like tlp-stress, nosqlbench, and ndbench to help them discover their cluster’s limits. In this post, we will explore the latest advancements in tlp-stress, highlighting the introduction of the new Adaptive Scheduler. This brand-new feature allows users to more easily uncover the throughput boundaries of Cassandra clusters while remaining within specific read and write latency targets. First though, we’ll take a brief look at the new workload designed to stress test the new Storage Attached Indexes feature coming in Cassandra 5.
AxonOps Review - An Operations Platform for Apache Cassandra
Note: Before we dive into this review of AxonOps and their offerings, it’s important to note that this blog post is part of a paid engagement in which I provided product feedback. AxonOps had no influence or say over the content of this post and did not have access to it prior to publishing.
In the ever-evolving landscape of data management, companies are constantly seeking solutions that can simplify the complexities of database operations. One such player in the market is AxonOps, a company that specializes in providing tooling for operating Apache Cassandra.
Benchmarking Apache Cassandra with tlp-stress
This post will introduce you to tlp-stress, a tool for benchmarking Apache Cassandra. I started tlp-stress back when I was working at The Last Pickle. At the time, I was spending a lot of time helping teams identify the root cause of performance issues and needed a way of benchmarking. I found cassandra-stress to be difficult to use and configure, so I ended up writing my own tool that worked in a manner that I found to be more useful. If you’re looking for a tool to assist you in benchmarking Cassandra, and you’re looking to get started quickly, this might be the right tool for you.
Back to Consulting!
Saying “it’s been a while since I wrote anything here” would be an understatement, but I’m back, with a lot to talk about in the upcoming months.
First off - if you’re not aware, I continued writing, but on The Last Pickle blog. There’s quite a few posts there, here are the most interesting ones:
- 14 Things To Do When Setting Up a New Cassandra Cluster
- Apache Cassandra Performance Tuning - Compression with Mixed Workloads
- Garbage Collection Tuning for Apache Cassandra
- Analyzing Cassandra Performance with Flame Graphs
- Cassandra Time Series Data Modeling For Massive Scale
Now the fun part - I’ve spent the last 3 years at Apple, then Netflix, neither of which gave me much time to continue my writing. As of this month, I’m officially no longer at Netflix and have started Rustyrazorblade Consulting!
Building a 100% ScyllaDB Shard-Aware Application Using Rust
Building a 100% ScyllaDB Shard-Aware Application Using Rust
I wrote a web transcript of the talk I gave with my colleagues Joseph and Yassir at [Scylla Su...
Learning Rust the hard way for a production Kafka+ScyllaDB pipeline
Learning Rust the hard way for a production Kafka+ScyllaDB pipeline
This is the web version of the talk I gave at [Scylla Summit 2022](https://www.scyllad...
On Scylla Manager Suspend & Resume feature
On Scylla Manager Suspend & Resume feature
!!! warning "Disclaimer" This blog post is neither a rant nor intended to undermine the great work that...
Renaming and reshaping Scylla tables using scylla-migrator
We have recently faced a problem where some of the first Scylla tables we created on our main production cluster were not in line any more with the evolved s...
Python scylla-driver: how we unleashed the Scylla monster's performance
At Scylla summit 2019 I had the chance to meet Israel Fruchter and we dreamed of working on adding **shard...
Scylla Summit 2019
I've had the pleasure to attend again and present at the Scylla Summit in San Francisco and the honor to be awarded the...
A Small Utility to Help With Extracting Code Snippets
It’s been a while since I’ve written anything here. Part of the reason has been due to the writing I’ve done over on the blog at The Last Pickle. In the lsat few years, I’ve written about our tlp-stress tool, tips for new Cassandra clusters, and a variety of performance posts related to Compaction, Compression, and GC Tuning.
The other reason is the eight blog posts I’ve got in the draft folder. One of the reasons why there are so many is the way I write. If the post is programming related, I usually start with the post, then start coding, pull snippets out, learn more, rework the post, then rework snippets. It’s an annoying, manual process. The posts sitting in my draft folder have incomplete code, and reworking the code is a tedious process that I get annoyed with, leading to abandoned posts.
Scylla: four ways to optimize your disk space consumption
We recently had to face free disk space outages on some of our scylla clusters and we learnt some very interesting things while outlining some improvements t...
Scylla Summit 2018 write-up
It's been almost one month since I had the chance to attend and speak at Scylla Summit 2018 so I'm reliev...
Authenticating and connecting to a SSL enabled Scylla cluster using Spark 2
This quick article is a wrap up for reference on how to connect to ScyllaDB using Spark 2 when authentication and SSL are enforced for the clients on the...
A botspot story
I felt like sharing a recent story that allowed us identify a bot in a haystack thanks to Scylla.
...
Evaluating ScyllaDB for production 2/2
In my previous blog post, I shared [7 lessons on our experience in evaluating Scylla](https://www.ultrabug.fr...
Accessing Private Variables in the JVM
In this I’ll discuss a uncommonly used but useful technique of accessing variables and methods which have been declared as private in the JVM, using the Apache Commons Lang library to work around the restriction. The description from the project page reads:
The standard Java libraries fail to provide enough methods for manipulation of its core classes. Apache Commons Lang provides these extra methods.
A couple weeks ago I was working on a project that required
parsing some CQL statements. There isn’t a standard parser separate
from the Cassandra project at the moment, so I decided to pull in
the entirety of cassandra-all from maven central. The parser in Cassandra isn’t
really designed to be used as a library. In particular, the
org.apache.cassandra.cql3.QueryProcessor has a
parseStatement(String) call, but the
ParsedStatement that’s returned doesn’t expose any of
the private variables via getters. I felt particularly determined
for some reason, so I decided to investigate a workaround.
Migration to Hugo
After almost five years of using Pelican as my static site generator, I’ve migrated to the Hugo tool. While I enjoyed Pelican and it’s flexibility, it’s performance started to bother me when building a site from scratch. Depending on what else was running on my laptop, a full build could take 15-20 seconds. This isn’t the end of the world, but in comparison Hugo takes less than 100 milliseconds.
If it was simply a matter of build time, I may not have really cared that much, but I’ve been using Hugo to build the site and documentation for Reaper, the open source repair tool we maintain at The Last Pickle.
Evaluating ScyllaDB for production 1/2
I have recently been conducting a quite deep evaluation of ScyllaDB to find out if we could benefit from this database in some of...
Working with gRPC, Kotlin and Gradle
Edit: The source code for this post is located on GitHub
Sometimes when I travel I end up trying to learn something completely new. For a while I was playing with Rust, Capn Proto, Scala, or I’d start a throwaway project at an airport and just tinker.
My passion is and has always been databases. I’ve maintained this blog for roughly a decade, starting with MySQL for the first part of my career but moving to Apache Cassandra several years ago, and am now a committer and member of the PMC.
I Am Still Writing!
If you were to take a look at my blog, you’d think I’d flipped a table and left the tech industry. Not the case at all. I’m still writing, but less frequently, and on the TLP blog. I intend to start writing here again, but the material will likely focus around topics other than Cassandra, since I’m already writing about it elsewhere. Here are the posts I’ve authored in the last 6 months or so:
Instaclustr Now Supporting Apache Cassandra 3.7 as LTS
Instacluster announced on the Apache Cassandra user list that they are making their supported branch of the Cassandra 3.7 tick tock release publicly available (see GitHub repo). Bug fixes that go into 3.8, 3.9, etc will be back ported to the Instacluster LTS. You can read the blog post about the decision.
Some people I’ve talked to are concerned about having different commercial entities doing long term supported releases, and this concern is understandable. The obvious preference is for the project maintainers to handle this and make an official LTS available. The big concern here is that third party LTS could fracture the project in the long term.
Rustyrazorblade Radio, A Distributed System Podcast
I haven’t blogged in a while, which is a bummer because I was determined to write an article a week for the entire year. I haven’t even come remotely close to that goal.
I’ve recently switched jobs from DataStax to Consulting with The Last Pickle, which has been pretty hectic. Add to that 3 presentations at the Cassandra Summit and the end result is very little time for personal projects.
Working Relationally With Cassandra
I’ve spent the last 4 years working in the big data world with Cassandra because it’s the only practical solution if you have a requirement to scale out, uptime is a priority, and you need predictable performance. I’ve heard different ways of describing where Cassandra fits in your architecture, but I think the best way to think of it is close to your customer. Think of the servers your mobile apps communicate with or what holds your product inventory.
Cassandra Dataset Manager Preview 1 Released
One of the problems of learning a new database is getting used to a new way of data modeling. PostgreSQL looks different from Redis, which is different from a graph, and is different from Cassandra.
Cassandra Dataset Manager aims to reduce the time spent in a frustrating trial and error process trying to learn proper data modeling techniques for Apache Cassandra and Datastax Enterprise by providing curated data models which have been designed by professionals with years of experience. Think of it as a package manager for Cassandra data models and sample data.
Cassandra Dataset Manager Video Preview
I posted a short preview showing off some of the work I’ve been doing recently on Cassandra Dataset Manager, a tool to help new Cassandra users learn how to create proper data models.
There’s documentation, but it’s still under heavy development.
Cassandra 3.3 Released
Apache Cassandra 3.3 was released last week. As per the Tick Tock release schedule, this release is focused on bug fixes and no new features were introduced. For practical purposes, consider this a bug fix release to Cassandra 3.2. All told there were almost 50 bugs fixed in this release. Many of the bugs fixed in this version also applied to Cassandra 3.0.3, which was also released last week.
Cassandra Secondary Index Preview #1
If you’ve looked into using Cassandra at all, you probably have heard plenty of warnings about its secondary indexes. If you’ve come from a relational background, you may have been surprised when you were told to create multiple tables (materialized views) instead of relying on indexes. This is because Cassandra is a distributed database, and the impact of doing a query that hits your entire cluster is you lose your linear scalability. If you’re capped at 25K queries per second per server, it doesn’t matter if you have one or a thousand servers, you’re still only able to handle 25k queries per second, total.
Async Python and Cassandra with Gevent
Introduction
Building a web app relying on database calls with CPython (the standard Python distribution) is pretty easy, but can suffer from performance problems. Python itself isn’t particularly fast, and in 2.x, it’s concurrency story is especially weak.
For starters, there’s the dreaded GIL. The GIL prevents us from taking advantage of multi core systems, so even if we use try to use threads we’re missing out on their main performance benefit, which is parallel computation.