Skip to main content

PyCon: Storm: the Hadoop of Realtime Stream Processing

See the website.

"Storm: Keeping it Real(time)."

Storm is from dotCloud which is a platform to scale web apps.

They're in the MEGA-DATA zone.

They were using RRD.

Storm is real-time, computation framework.

It can do distributed RPC and stream processing.

It focuses on continuous computation, such as counting all the things passing by on a stream.

Storm does for real-time what Hadoop does for batch processing.

It is a high-volume, distributed, horizontally scalable, continuous system.

Even if the control layer goes down, computation can keep going.

It's strategy for handling failures is to die and recover quickly.

It is fault tolerant, but not fault proof.

Data is processed at least once. With more work and massaging, they have support for "exactly once".

Storm does not handle persistence.

If failures happen, it resubmits stuff through the system.

It doesn't process batches reliability.

It complements Hadoop, but does not attempt to replace Hadoop.

It does not protect against human error.

He suggested that one day we'll use a mix of batching and streaming to get the benefits of both.

Storm has three core elements:
  1. Sprouts inject data into the system. This could be data from a queue. This could be data from the Twitter firehose.
  2. Streams are an unbounded sequence of storm tuples. These are like named tuples. All tuples of the same stream must have same "shape".
  3. Bolts take inputs and transform them to make output streams. 0 or more inputs produces 0 or more outputs. Most of the computation happens here.
Sprouts and bolts can both produce multiple output streams.

A topology is a set of sprouts and bolts connected by streams.

This is a higher-level abstraction than message passing.

All of this is done over 0mq. It uses ZooKeeper for discovery. Storm simplifies all of this.

They're handling 10k-100k requests per second at their company.

Storm is JVM based. It's a 50/50 mix of Java and Clojure. It has a multilingual API. Script bolts can be written using a thin shell that shells out to Python.

"Umbrella" protects you from the Storm. It lets you use Storm pretty much Java free.

He's using nested classes for declarative programming.

He deployed it on DOTCLOUD.

A storm topology can even have cycles.

Comments

Popular posts from this blog

Drawing Sierpinski's Triangle in Minecraft Using Python

In his keynote at PyCon, Eben Upton, the Executive Director of the Rasberry Pi Foundation, mentioned that not only has Minecraft been ported to the Rasberry Pi, but you can even control it with Python. Since four of my kids are avid Minecraft fans, I figured this might be a good time to teach them to program using Python. So I started yesterday with the goal of programming something cool for Minecraft and then showing it off at the San Francisco Python Meetup in the evening.

The first problem that I faced was that I didn't have a Rasberry Pi. You can't hack Minecraft by just installing the Minecraft client. Speaking of which, I didn't have the Minecraft client installed either ;) My kids always play it on their Nexus 7s. I found an open source Minecraft server called Bukkit that "provides the means to extend the popular Minecraft multiplayer server." Then I found a plugin called RaspberryJuice that implements a subset of the Minecraft Pi modding API for Bukkit s…

Apple: iPad and Emacs

Someone asked my boss's buddy Art Medlar if he was going to buy an iPad. He said, "I figure as soon as it runs Emacs, that will be the sign to buy." I think he was just trying to be funny, but his statement is actually fairly profound.

It's well known that submitting iPhone and iPad applications for sale on Apple's store is a huge pain--even if they're free and open source. Apple is acting as a gatekeeper for what is and isn't allowed on your device. I heard that Apple would never allow a scripting language to be installed on your iPad because it would allow end users to run code that they hadn't verified. (I don't have a reference for this, but if you do, please post it below.) Emacs is mostly written in Emacs Lisp. Per Apple's policy, I don't think it'll ever be possible to run Emacs on the iPad.

Emacs was written by Richard Stallman, and it practically defines the Free Software movement (in a manner of speaking at least). Stal…

ERNOS: Erlang Networked Operating System

I've been reading Dreaming in Code lately, and I really like it. If you're not a dreamer, you may safely skip the rest of this post ;)

In Chapter 10, "Engineers and Artists", Alan Kay, John Backus, and Jaron Lanier really got me thinking. I've also been thinking a lot about Minix 3, Erlang, and the original Lisp machine. The ideas are beginning to synthesize into something cohesive--more than just the sum of their parts.

Now, I'm sure that many of these ideas have already been envisioned within Tunes.org, LLVM, Microsoft's Singularity project, or in some other place that I haven't managed to discover or fully read, but I'm going to blog them anyway.

Rather than wax philosophical, let me just dump out some ideas:Start with Minix 3. It's a new microkernel, and it's meant for real use, unlike the original Minix. "This new OS is extremely small, with the part that runs in kernel mode under 4000 lines of executable code." I bet it&…