mrflip

Tuning Storm+Trident

Tuning a dataflow system is easy:

The First Rule of Dataflow Tuning:
* Ensure each stage is always ready to accept records, and
* Deliver each processed record promptly to its destination

jasonberanek

VMware ESXi includes a built in VNC server that can be used to access a VMs console for manipulation via automated tools (e.g., veewee) or by users on platforms where the vSphere Client is not supported. In ESXi 5.x, the built-in firewall does not allow VNC traffic to be received by the VNC server, even when an individual VM is configured to support this configuration. To complete this activity, the firewall has to be modified to allow the appropriate ports.

The below script can be run via the ESXi command line to setup the firewall rules necessary to run VNC. A few items to note:

• Scripts assumes the firewall rules file is the default provided as by 5.0.0 update 2 build 914586 and/or 5.1.0 build 799733 (may work in other versions)
• In order to persist settings after a reboot, it is necessary to copy the firewall settings to either a specific datastore mapped to the host, or the local persistent storage linked under the /store directory. Further, the either the /etc/rc.local (ESXi 5.0) or `/etc/rc.local

seancribbs

This is a distillation of a technique we use internally at Basho to reduce the pain of cloning some of our larger repos. It relies a bit on shell scripts and environment variables, but it can be run more directly, as I show below.

1. Create a bare git repository in some directory, e.g. /var/lib/gitcache.

   git init --bare /var/lib/gitcache

2. Add all repositories you want to cache as remotes to the git repository, e.g.

dln

ZOO_LOG4J_PROP="INFO,ROLLINGFILE"
ZOO_LOG_DIR="/var/log/zookeeper/"