[ec2-user@ip-10-194-5-76 ~]$ java -version java version "1.6.0_24" OpenJDK Runtime Environment (IcedTea6 1.11.11) (amazon-61.1.11.11.53.amzn1-x86_64) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
Yes, as soon as I put it under heavy load, it would buckle almost consistently. I knew it was JDK related because I temporarily gave up on AWS, but I was able to run the same code on my MacBook Pro without issue. That's when I upgraded AWS to Oracle Java 7 64-bit and all my crashes disappeared under load. Jason ________________________________________ From: Scott Clasen [sc...@heroku.com] Sent: Wednesday, May 22, 2013 19:27 To: users Subject: Re: Apache Kafka in AWS Hey Jason, question what openjdk version did you have issues with? Im running kafka on it now and has been ok. Was it a crash only at load? Thanks SC On Wed, May 22, 2013 at 1:42 PM, Jason Weiss <jason_we...@rapid7.com> wrote: > All, > > I asked a number of questions of the group over the last week, and I'm > happy to report that I've had great success getting Kafka up and running in > AWS. I am using 3 EC2 instances, each of which is a M2 High-Memory > Quadruple Extra Large with 8 cores and 58.4 GiB of memory according to the > AWS specs. I have co-located Zookeeper instances next to Zafka on each > machine. > > I am able to publish in a repeatable fashion 273,000 events per second, > with each event payload consisting of a fixed size of 2048 bytes! This > represents the maximum throughput possible on this configuration, as the > servers became CPU constrained, averaging 97% utilization in a relatively > flat line. This isn't a "burst" speed – it represents a sustained > throughput from 20 M1 Large EC2 Kafka multi-threaded producers. Putting > this into perspective, if my log retention period was a month, I'd be > aggregating 1.3 petabytes of data on my disk drives. Suffice to say, I > don't see us retaining data for more than a few hours! > > Here were the keys to tuning for future folks to consider: > > First and foremost, be sure to configure your Java heap size accordingly > when you launch Kafka. The default is like 512MB, which in my case left > virtually all of my RAM inaccessible to Kafka. > Second, stay away from OpenJDK. No, seriously – this was a huge thorn in > my side, and I almost gave up on Kafka because of the problems I > encountered. The OpenJDK NIO functions repeatedly resulted in Kafka > crashing and burning in dramatic fashion. The moment I switched over to > Oracle's JDK for linux, Kafka didn't puke once- I mean, like not even a > hiccup. > Third know your message size. In my opinion, the more you understand about > your event payload characteristics, the better you can tune the system. The > two knobs to really turn are the log.flush.interval and > log.default.flush.interval.ms. The values here are intrinsically > connected to the types of payloads you are putting through the system. > Fourth and finally, to maximize throughput you have to code against the > async paradigm, and be prepared to tweak the batch size, queue properties, > and compression codec (wait for it…) in a way that matches the message > payload you are putting through the system and the capabilities of the > producer system itself. > > > Jason > > > > > > This electronic message contains information which may be confidential or > privileged. The information is intended for the use of the individual or > entity named above. If you are not the intended recipient, be aware that > any disclosure, copying, distribution or use of the contents of this > information is prohibited. If you have received this electronic > transmission in error, please notify us by e-mail at ( > postmas...@rapid7.com) immediately. > This electronic message contains information which may be confidential or privileged. The information is intended for the use of the individual or entity named above. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic transmission in error, please notify us by e-mail at (postmas...@rapid7.com) immediately.
