Twitter Heron: Stream Processing at Scale | Hacker News Reader

Twitter Heron: Stream Processing at Scale

blog.acolyer.org

49 pointsmekishizufu12 comments

Open articleView on HN

"In the evaluation in section 7 of the paper, Heron beats Storm in every single metric."

In every metric except perhaps the most important one for actual users:

Storm is open source, Heron isn't.

Also, the @TwitterOSS account indicated that there are "no plans to open source in the short-term":

https://twitter.com/TwitterOSS/status/605460461761396736

The paper contains the motivation: "For our needs at Twitter, we needed a stream processing platform that was open-source, high-performance, scalable, and was compatible with the current Storm API."

I guess 3/4 isn't bad.

> All the Stream Managers in a topology connect to each other to form an O(k^2) connection network

shouldn't that be !(k-1)? Or am I missing something about the architecture?

Every stream manager is connected to every other stream manager. k managers = k^2 connections.

Yea I must be missing something here.

If you have k=2 stream managers you have 1 connection, not 4 . Even if the connections weren't bidirectional you'd have 2 connections.

it's (k-1)^2 actually - each to each except self.

Parent is talking big-O and so is ignoring that it isn't exactly k^2. Depending on how you count (do 2 nodes require 2 connections or 1 bi-directional connection) it's k(k-1).

Is the paper online? If someone can produce a standard URL for it, we'll change the link in this post.

http://dl.acm.org/citation.cfm?id=2742788

Sorry, I meant the pdf. Is there a url for it that will work for everybody? The one I get when I click "pdf" on that ACM page seems unlikely.

SIGMOD 2015 proceedings are open access, meaning the conference has arranged with ACM to provide the content to pretty much everyone.

That being said, the submission is to someone's (Adrian's) interpretation of the work, and is arguably more useful than just linking at the pdf itself.

Now I get it. It's not just "I didn't write this, therefore shit, so I need to rewrite it from scratch." This was a clear explanation in a bite sized chunk which illustrated the reasons for Heron. Thanks.

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