Why is My Java Application Freezing Under Heavy I/O Load?

Author: , June 17th, 2019

Latency-sensitive applications running in Java sometimes experience unacceptable delays under heavy I/O load. This blog discusses why this problem occurs and what to do about it for applications running Tungsten Clustering for MySQL.

How To Add AWS EC2 API Tools to Ubuntu AMI Instance

Author: , March 28th, 2013

https://help.ubuntu.com/community/EC2APITools https://help.ubuntu.com/community/Repositories/CommandLine#Adding_the_Universe_and_Multiverse_Repositories As root in /root: vim /etc/apt/sources.list ## Added to the bottom: deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ hardy multiverse deb http://us.archive.ubuntu.com/ubuntu/ hardy-updates multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ hardy-updates multiverse apt-get update apt-get install sun-java5-jre apt-get install unzip wget http://s3.amazonaws.com/ec2-downloads/ec2-api-tools-1.3-34128.zip unzip ec2-api-tools-1.3-34128.zip export EC2_HOME=/root/ec2-api-tools-1.3-34128 export PATH=$PATH:$EC2_HOME/bin mkdir .pem Copy downloaded X.509 private key and cert into […]

How To Use jPerfmeter with rpc.rstatd

Author: , November 1st, 2011

Download the program from SourceForge: http://jperfmeter.sourceforge.net/

Here is how I invoke jperfmeter using a shell script called perfmon: perfmon script

HINT: rpc.rstatd and jPerfmeter communicate using RPC via UDP – be sure to open your firewall to allow this.

How To Fix “trustAnchors parameter must be non-empty”

Author: , January 8th, 2011

Install the latest Sun version of the JDK and set $JAVA_HOME to it. # wget -O jdk-6u23-linux-i586-rpm.bin ‘http://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_Developer-Site/en_US/-/USD/VerifyItem-Start/jdk-6u23-linux-i586-rpm.bin?BundledLineItemUUID=6vKJ_hCvsgsAAAEtIlQpGGh0&OrderID=oFmJ_hCvw1AAAAEtFVQpGGh0&ProductID=QhOJ_hCw.dUAAAEsFIMcKluK&FileName=/jdk-6u23-linux-i586-rpm.bin’ # sh ./jdk-6u23-linux-i586-rpm.bin # export JAVA_HOME=/usr/java/latest